diff --git a/src/core/messenger/scroll.spec.ts b/src/core/messenger/scroll.spec.ts
index d9c997dd1..731ca7c2f 100644
--- a/src/core/messenger/scroll.spec.ts
+++ b/src/core/messenger/scroll.spec.ts
@@ -1,4 +1,3 @@
-import { noop } from '../../utils/noop';
 import { _ as testExports } from './scroll';
 
 const addScrollListener = testExports.addScrollListener;
@@ -91,8 +90,8 @@ describe.skip('Cross-frame messenger: scroll', () => {
 			constructor(callback: ObsCallback) {
 				onIntersect = callback;
 				return Object.freeze({
-					observe: noop,
-					unobserve: noop,
+					observe: () => {},
+					unobserve: () => {},
 					disconnect: () => {
 						onIntersect = null;
 					},
diff --git a/src/define/define-slot.spec.ts b/src/define/define-slot.spec.ts
index 6d199c2e8..095a2ab57 100644
--- a/src/define/define-slot.spec.ts
+++ b/src/define/define-slot.spec.ts
@@ -1,6 +1,5 @@
 import type { SizeMapping } from '../core/ad-sizes';
 import { adSizes, createAdSize } from '../core/ad-sizes';
-import { toGoogleTagSize } from '../utils/googletag-ad-size';
 import {
 	buildGoogletagSizeMapping,
 	collectSizes,
@@ -74,21 +73,11 @@ describe('buildGoogletagSizeMapping', () => {
 		expect(result).toEqual([
 			[
 				[980, 0],
-				[
-					toGoogleTagSize(adSizes.mpu),
-					'fluid',
-					toGoogleTagSize(adSizes.googleCard),
-					toGoogleTagSize(adSizes.halfPage),
-				],
+				[adSizes.mpu, 'fluid', adSizes.googleCard, adSizes.halfPage],
 			],
 			[
 				[0, 0],
-				[
-					toGoogleTagSize(adSizes.mpu),
-					'fluid',
-					toGoogleTagSize(adSizes.googleCard),
-					toGoogleTagSize(adSizes.halfPage),
-				],
+				[adSizes.mpu, 'fluid', adSizes.googleCard, adSizes.halfPage],
 			],
 		]);
 	});
diff --git a/src/define/define-slot.ts b/src/define/define-slot.ts
index 70fe6a683..db6f46661 100644
--- a/src/define/define-slot.ts
+++ b/src/define/define-slot.ts
@@ -1,9 +1,8 @@
 import { breakpoints as sourceBreakpoints } from '@guardian/source/foundations';
 import { once } from 'lodash-es';
-import type { SizeMapping, SlotName } from '../core/ad-sizes';
+import type { AdSize, SizeMapping, SlotName } from '../core/ad-sizes';
 import { EventTimer } from '../core/index';
 import { isEligibleForTeads } from '../core/targeting/teads-eligibility';
-import { toGoogleTagSize } from '../utils/googletag-ad-size';
 import { getUrlVars } from '../utils/url';
 import { initSlotIas } from './init-slot-ias';
 
@@ -29,6 +28,11 @@ const isBreakpoint = (
 ): breakpoint is keyof typeof breakpointViewports =>
 	breakpoint in breakpointViewports;
 
+const toGoogleTagSize = (size: AdSize): googletag.SingleSize => {
+	// not using width and height here as to maintain compatibility with plain arrays
+	return size[0] === 0 && size[1] === 0 ? 'fluid' : [size[0], size[1]];
+};
+
 /**
  * Builds a googletag size mapping based on the breakpoints and ad sizes from
  * the size mapping in commercial-core and the viewport sizes from source-foundations.
diff --git a/src/init/consented/prepare-googletag.spec.ts b/src/init/consented/prepare-googletag.spec.ts
index 4aa68b62e..a512e9779 100644
--- a/src/init/consented/prepare-googletag.spec.ts
+++ b/src/init/consented/prepare-googletag.spec.ts
@@ -3,39 +3,11 @@ import { getConsentFor, loadScript, onConsent } from '@guardian/libs';
 import type * as AdSizesType from '../../core/ad-sizes';
 import { loadAdvert } from '../../display/load-advert';
 import { commercialFeatures } from '../../lib/commercial-features';
-import _config from '../../lib/config';
 import { getCurrentBreakpoint as getCurrentBreakpoint_ } from '../../lib/detect/detect-breakpoint';
 import { dfpEnv } from '../../lib/dfp/dfp-env';
 import { init as prepareGoogletag } from './prepare-googletag';
 import { fillStaticAdvertSlots } from './static-ad-slots';
 
-const config = _config as {
-	get: (k: string) => string;
-	set: (
-		k: string,
-		v:
-			| boolean
-			| string
-			| Record<string, never>
-			| {
-					adUnit: string;
-					contentType: string;
-					edition: string;
-					isFront: boolean;
-					keywordIds: string;
-					pageId: string;
-					section: string;
-					seriesId: string;
-					sharedAdTargeting: {
-						ct: string;
-						edition: string;
-						k: string[];
-						se: string[];
-					};
-			  },
-	) => void;
-};
-
 const getAdverts = (withEmpty: boolean) => {
 	return [...dfpEnv.adverts.values()].map((advert) => {
 		// Do not return empty slots unless explicitly requested
@@ -270,10 +242,11 @@ describe('DFP', () => {
 	} = {} as const;
 
 	beforeEach(() => {
-		config.set('page', {
+		// @ts-expect-error -- test
+		window.guardian.config.page = {
 			adUnit: '/123456/theguardian.com/front',
 			contentType: 'Article',
-			edition: 'us',
+			edition: 'US',
 			isFront: true,
 			keywordIds: 'world/korea,world/ukraine',
 			pageId: 'world/uk',
@@ -285,7 +258,7 @@ describe('DFP', () => {
 				k: ['korea', 'ukraine'],
 				se: ['happy-times'],
 			},
-		});
+		};
 
 		document.body.innerHTML = domSnippet;
 
diff --git a/src/insert/spacefinder/article.spec.ts b/src/insert/spacefinder/article.spec.ts
index 0c764af47..4bf8dde4e 100644
--- a/src/insert/spacefinder/article.spec.ts
+++ b/src/insert/spacefinder/article.spec.ts
@@ -20,8 +20,6 @@ jest.mock('insert/spacefinder/space-filler', () => ({
 	},
 }));
 
-jest.mock('lib/config', () => ({ page: {}, get: () => false }));
-
 jest.mock('experiments/ab', () => ({
 	isUserInVariant: () => false,
 }));
diff --git a/src/lib/config.d.ts b/src/lib/config.d.ts
deleted file mode 100644
index 74452c35e..000000000
--- a/src/lib/config.d.ts
+++ /dev/null
@@ -1,21 +0,0 @@
-declare function get<T>(path: string): T | undefined;
-declare function get<T>(path: string, defaultValue: T): T;
-declare const set: (path: string, defaultValue?: unknown) => void;
-declare const hasTone: (s: string) => boolean;
-declare const hasSeries: (s: string) => boolean;
-declare const referenceOfType: (name: string) => string;
-declare const referencesOfType: (name: string) => string[];
-declare const webPublicationDateAsUrlPart: () => string | null;
-declare const dateFromSlug: () => string | null;
-
-// eslint-disable-next-line import/no-default-export -- it’s a declaration
-export default {
-	get,
-	set,
-	hasTone,
-	hasSeries,
-	referenceOfType,
-	referencesOfType,
-	webPublicationDateAsUrlPart,
-	dateFromSlug,
-};
diff --git a/src/lib/config.js b/src/lib/config.js
deleted file mode 100644
index 36f80d0ce..000000000
--- a/src/lib/config.js
+++ /dev/null
@@ -1,86 +0,0 @@
-// This should be the only module accessing the window config object directly
-// because this is the one that gets imported to all other modules
-// eslint-disable-next-line guardian-frontend/global-config
-const config = window.guardian.config;
-
-// allows you to safely get items from config using a query of
-// dot or bracket notation, with optional default fallback
-const get = (path = '', defaultValue) => {
-	const value = path
-		.replace(/\[(.+?)\]/g, '.$1')
-		.split('.')
-		.reduce((o, key) => o && o[key], config);
-
-	if (typeof value !== 'undefined') {
-		return value;
-	}
-
-	return defaultValue;
-};
-
-// let S = { l1, l2, ..., ln } be a non-empty ordered set of labels
-// let s = l1.l2.....ln be the string representation of S
-// set(s, x) is the function that takes any value x into the config
-// object following the path described by S, making sure that path
-// actually leads somewhere.
-const set = (path, value) => {
-	const pathSegments = path.split('.');
-	const last = pathSegments.pop();
-	pathSegments.reduce((obj, subpath) => {
-		if (typeof obj[subpath] === 'object') {
-			return obj[subpath];
-		}
-		obj[subpath] = {};
-		return obj[subpath];
-	}, config)[last] = value;
-};
-
-const hasTone = (name) => (config.page.tones || '').includes(name);
-
-const hasSeries = (name) => (config.page.series || '').includes(name);
-
-const referencesOfType = (name) =>
-	(config.page.references || [])
-		.filter((reference) => typeof reference[name] !== 'undefined')
-		.map((reference) => reference[name]);
-
-const referenceOfType = (name) => referencesOfType(name)[0];
-
-// the date nicely formatted and padded for use as part of a url
-// looks like    2012/04/31
-const webPublicationDateAsUrlPart = () => {
-	const webPublicationDate = config.page.webPublicationDate;
-
-	if (webPublicationDate) {
-		const pubDate = new Date(webPublicationDate);
-		return `${pubDate.getFullYear()}/${(pubDate.getMonth() + 1)
-			.toString()
-			.padStart(2, '0')}/${pubDate
-			.getDate()
-			.toString()
-			.padStart(2, '0')}`;
-	}
-
-	return null;
-};
-
-// returns 2014/apr/22
-const dateFromSlug = () => {
-	const s = config.page.pageId.match(/\d{4}\/\w{3}\/\d{2}/);
-	return s ? s[0] : null;
-};
-
-export default Object.assign(
-	{},
-	{
-		get,
-		set,
-		hasTone,
-		hasSeries,
-		referencesOfType,
-		referenceOfType,
-		webPublicationDateAsUrlPart,
-		dateFromSlug,
-	},
-	config,
-);
diff --git a/src/lib/cookies.js b/src/lib/cookies.js
deleted file mode 100644
index 0920ece33..000000000
--- a/src/lib/cookies.js
+++ /dev/null
@@ -1,65 +0,0 @@
-import { reportError } from '../utils/report-error';
-import config from './config';
-
-const ERR_INVALID_COOKIE_NAME = `Cookie must not contain invalid characters (space, tab and the following characters: '()<>@,;"/[]?={}')`;
-
-// subset of https://github.com/guzzle/guzzle/pull/1131
-const isValidCookieValue = (name) => !/[()<>@,;"\\/[\]?={} \t]/g.test(name);
-
-const getShortDomain = ({ isCrossSubdomain = false } = {}) => {
-	const domain = document.domain || '';
-
-	if (domain === 'localhost' || config.get('page.isPreview')) {
-		return domain;
-	}
-
-	// Trim any possible subdomain (will be shared with supporter, identity, etc)
-	if (isCrossSubdomain) {
-		return ['', ...domain.split('.').slice(-2)].join('.');
-	}
-	// Trim subdomains for prod (www.theguardian), code (m.code.dev-theguardian) and dev (dev.theguardian, m.thegulocal)
-	return domain.replace(/^(www|m\.code|dev|m)\./, '.');
-};
-
-const getDomainAttribute = ({ isCrossSubdomain = false } = {}) => {
-	const shortDomain = getShortDomain({ isCrossSubdomain });
-	return shortDomain === 'localhost' ? '' : ` domain=${shortDomain};`;
-};
-
-const removeCookie = (name, currentDomainOnly = false) => {
-	const expires = 'expires=Thu, 01 Jan 1970 00:00:01 GMT;';
-	const path = 'path=/;';
-
-	// Remove cookie, implicitly using the document's domain.
-	document.cookie = `${name}=;${path}${expires}`;
-	if (!currentDomainOnly) {
-		// also remove from the short domain
-		document.cookie = `${name}=;${path}${expires} domain=${getShortDomain()};`;
-	}
-};
-
-const addCookie = (name, value, daysToLive, isCrossSubdomain = false) => {
-	const expires = new Date();
-
-	if (!isValidCookieValue(name) || !isValidCookieValue(value)) {
-		reportError(
-			new Error(`${ERR_INVALID_COOKIE_NAME} .${name}=${value}`),
-			'commercial',
-		);
-	}
-
-	if (daysToLive) {
-		expires.setDate(expires.getDate() + daysToLive);
-	} else {
-		expires.setMonth(expires.getMonth() + 5);
-		expires.setDate(1);
-	}
-
-	document.cookie = `${name}=${value}; path=/; expires=${expires.toUTCString()};${getDomainAttribute(
-		{
-			isCrossSubdomain,
-		},
-	)}`;
-};
-
-export { addCookie, removeCookie };
diff --git a/src/lib/header-bidding/a9/a9.ts b/src/lib/header-bidding/a9/a9.ts
index 40b61fb29..f7678a37f 100644
--- a/src/lib/header-bidding/a9/a9.ts
+++ b/src/lib/header-bidding/a9/a9.ts
@@ -1,7 +1,7 @@
 import { flatten } from 'lodash-es';
 import type { Advert } from '../../../define/Advert';
 import type { A9AdUnitInterface } from '../../../types/global';
-import { noop } from '../../../utils/noop';
+import { reportError } from '../../../utils/report-error';
 import type { HeaderBiddingSlot, SlotFlatMap } from '../prebid-types';
 import { getHeaderBiddingAdSlots } from '../slot-config';
 
@@ -82,7 +82,9 @@ const requestBids = async (
 					});
 				}),
 		)
-		.catch(noop);
+		.catch(() => {
+			reportError(new Error('a9 header bidding error'), 'commercial');
+		});
 
 	return requestQueue;
 };
diff --git a/src/lib/header-bidding/prebid/appnexus.spec.ts b/src/lib/header-bidding/prebid/appnexus.spec.ts
index a8170cfbc..77ab299bb 100644
--- a/src/lib/header-bidding/prebid/appnexus.spec.ts
+++ b/src/lib/header-bidding/prebid/appnexus.spec.ts
@@ -41,10 +41,6 @@ jest.mock('experiments/ab', () => ({
 	isUserInVariant: jest.fn(),
 }));
 
-jest.mock('lib/cookies', () => ({
-	getCookie: jest.fn(),
-}));
-
 const resetConfig = () => {
 	window.guardian.ophan = {
 		pageViewId: 'pvid',
diff --git a/src/lib/header-bidding/prebid/bid-config.spec.ts b/src/lib/header-bidding/prebid/bid-config.spec.ts
index 5e9794445..e51b4ee98 100644
--- a/src/lib/header-bidding/prebid/bid-config.spec.ts
+++ b/src/lib/header-bidding/prebid/bid-config.spec.ts
@@ -8,7 +8,6 @@ import {
 	isInUsa as isInUsa_,
 	isInUsOrCa as isInUsOrCa_,
 } from '../../../utils/geo-utils';
-import config from '../../config';
 import type { HeaderBiddingSize, PrebidBidder } from '../prebid-types';
 import {
 	containsBillboard as containsBillboard_,
@@ -84,10 +83,6 @@ jest.mock('experiments/ab', () => ({
 	isUserInVariant: jest.fn(),
 }));
 
-jest.mock('lib/cookies', () => ({
-	getCookie: jest.fn(),
-}));
-
 const resetConfig = () => {
 	window.guardian.ophan = {
 		pageViewId: 'pvid',
@@ -144,11 +139,14 @@ describe('indexExchangeBidders', () => {
 	beforeEach(() => {
 		resetConfig();
 		getBreakpointKey.mockReturnValue('D');
-		config.set('page.pbIndexSites', [
-			{ bp: 'D', id: 123456 },
-			{ bp: 'M', id: 234567 },
-			{ bp: 'T', id: 345678 },
-		]);
+		// @ts-expect-error -- test
+		window.guardian.config.page = {
+			pbIndexSites: [
+				{ bp: 'D', id: 123456 },
+				{ bp: 'M', id: 234567 },
+				{ bp: 'T', id: 345678 },
+			],
+		};
 	});
 
 	afterEach(() => {
@@ -206,11 +204,14 @@ describe('getIndexSiteId', () => {
 	});
 
 	test('should find the correct ID for the breakpoint', () => {
-		config.set('page.pbIndexSites', [
-			{ bp: 'D', id: 123456 },
-			{ bp: 'M', id: 234567 },
-			{ bp: 'T', id: 345678 },
-		]);
+		// @ts-expect-error -- test
+		window.guardian.config.page = {
+			pbIndexSites: [
+				{ bp: 'D', id: 123456 },
+				{ bp: 'M', id: 234567 },
+				{ bp: 'T', id: 345678 },
+			],
+		};
 		const breakpoints = ['M', 'D', 'M', 'T', 'D'];
 		const results = [];
 		for (let i = 0; i < breakpoints.length; i += 1) {
diff --git a/src/lib/header-bidding/slot-config.spec.ts b/src/lib/header-bidding/slot-config.spec.ts
index cc06c8600..8135c2155 100644
--- a/src/lib/header-bidding/slot-config.spec.ts
+++ b/src/lib/header-bidding/slot-config.spec.ts
@@ -20,10 +20,6 @@ jest.mock('experiments/ab', () => ({
 	),
 }));
 
-jest.mock('lib/cookies', () => ({
-	getCookie: jest.fn(),
-}));
-
 jest.mock('define/init-slot-ias', () => ({
 	initSlotIas: jest.fn(() => Promise.resolve()),
 }));
diff --git a/src/utils/googletag-ad-size.ts b/src/utils/googletag-ad-size.ts
deleted file mode 100644
index 9d782a4f0..000000000
--- a/src/utils/googletag-ad-size.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-import type { AdSize } from '../core/ad-sizes';
-
-export const toGoogleTagSize = (size: AdSize): googletag.SingleSize => {
-	// not using width and height here as to maintain compatibility with plain arrays
-	return size[0] === 0 && size[1] === 0 ? 'fluid' : [size[0], size[1]];
-};
diff --git a/src/utils/noop.ts b/src/utils/noop.ts
deleted file mode 100644
index cc6b342f9..000000000
--- a/src/utils/noop.ts
+++ /dev/null
@@ -1,6 +0,0 @@
-// eslint-disable-next-line @typescript-eslint/no-unused-vars -- they’re discarded
-const noop = (..._args: unknown[]): void => {
-	// do nothing
-};
-
-export { noop };
diff --git a/src/utils/support-utilities.spec.ts b/src/utils/support-utilities.spec.ts
deleted file mode 100644
index bd9fade67..000000000
--- a/src/utils/support-utilities.spec.ts
+++ /dev/null
@@ -1,38 +0,0 @@
-import { removeCookie, setCookie } from '@guardian/libs';
-import { _ } from './geolocation';
-import { addCountryGroupToSupportLink } from './support-utilities';
-
-const { countryCookieName } = _;
-
-describe('addCountryGroupToSupportLink', () => {
-	beforeEach(() => {
-		removeCookie({ name: countryCookieName });
-	});
-
-	test('adds country group to subscribe link', () => {
-		setCookie({ name: countryCookieName, value: 'GB' });
-		expect(
-			addCountryGroupToSupportLink(
-				'https://support.theguardian.com/subscribe',
-			),
-		).toEqual('https://support.theguardian.com/uk/subscribe');
-	});
-
-	test('adds country group to contribute link', () => {
-		setCookie({ name: countryCookieName, value: 'FR' });
-		expect(
-			addCountryGroupToSupportLink(
-				'https://support.theguardian.com/contribute',
-			),
-		).toEqual('https://support.theguardian.com/eu/contribute');
-	});
-
-	test('does not add country group to contribute link with country group already in it', () => {
-		setCookie({ name: countryCookieName, value: 'GB' });
-		expect(
-			addCountryGroupToSupportLink(
-				'https://support.theguardian.com/int/contribute',
-			),
-		).toEqual('https://support.theguardian.com/int/contribute');
-	});
-});
diff --git a/src/utils/support-utilities.ts b/src/utils/support-utilities.ts
deleted file mode 100644
index 6d40dede3..000000000
--- a/src/utils/support-utilities.ts
+++ /dev/null
@@ -1,28 +0,0 @@
-import {
-	countryCodeToSupportInternationalisationId,
-	getCountryCode,
-} from './geolocation';
-
-const supportUrlRegex = /(support.theguardian.com)\/(contribute|subscribe)/;
-
-/**
- * @param  {string} rawUrl
- * return the support url with country group inserted at the beginning of the path
- */
-const addCountryGroupToSupportLink = (rawUrl: string): string => {
-	const countryCode = getCountryCode();
-	const countryGroup =
-		countryCodeToSupportInternationalisationId(countryCode);
-	return rawUrl.replace(
-		supportUrlRegex,
-		(_, domain: string, path: string) =>
-			`${domain}/${countryGroup.toLowerCase()}/${path}`,
-	);
-};
-
-const supportSubscribeURL = (): string =>
-	addCountryGroupToSupportLink('https://support.theguardian.com/subscribe');
-const supportSubscribeDigitalURL = (): string =>
-	`${supportSubscribeURL()}/digital`;
-
-export { supportSubscribeDigitalURL, addCountryGroupToSupportLink };
diff --git a/src/utils/time-utils.spec.ts b/src/utils/time-utils.spec.ts
deleted file mode 100644
index 9cf5d4b62..000000000
--- a/src/utils/time-utils.spec.ts
+++ /dev/null
@@ -1,40 +0,0 @@
-import MockDate from 'mockdate';
-import { dateDiffDays, isExpired } from './time-utils';
-
-describe('calculating the difference between 2 dates', () => {
-	it('should return the correct duration', () => {
-		const oneDayMs = 1000 * 60 * 60 * 24;
-
-		const now = Date.now();
-
-		expect(dateDiffDays(now, now + oneDayMs)).toBe(1);
-
-		expect(dateDiffDays(now, now + oneDayMs - 1)).toBe(0);
-
-		expect(dateDiffDays(now, now + 4 * oneDayMs - 1)).toBe(3);
-	});
-});
-
-describe('Determining whether or not an AB test is expired', () => {
-	beforeAll(() => {
-		MockDate.set('Thu Jan 01 2021 12:00:00 GMT+0000 (Greenwich Mean Time)');
-	});
-
-	afterAll(() => {
-		MockDate.reset();
-	});
-
-	it('should return the correct result', () => {
-		const expiredYesterdayJustBeforeMidnight =
-			'Wed Dec 31 2020 23:59:59 GMT+0000 (Greenwich Mean Time)';
-		expect(isExpired(expiredYesterdayJustBeforeMidnight)).toBe(true);
-
-		const expiringTodayJustAfterMidnight =
-			'Thu Jan 01 2021 00:00:01 GMT+0000 (Greenwich Mean Time)';
-		expect(isExpired(expiringTodayJustAfterMidnight)).toBe(false);
-
-		const expiringTomorrow =
-			'Fri Jan 02 2021 12:00:00 GMT+0000 (Greenwich Mean Time)';
-		expect(isExpired(expiringTomorrow)).toBe(false);
-	});
-});
diff --git a/src/utils/time-utils.ts b/src/utils/time-utils.ts
deleted file mode 100644
index c15740f92..000000000
--- a/src/utils/time-utils.ts
+++ /dev/null
@@ -1,16 +0,0 @@
-// from and to should be Epoch time in milliseconds
-const dateDiffDays = (from: number, to: number): number => {
-	const oneDayMs = 1000 * 60 * 60 * 24;
-	const diffMs = to - from;
-	return Math.floor(diffMs / oneDayMs);
-};
-
-const isExpired = (testExpiry: string): boolean => {
-	// new Date(test.expiry) sets the expiry time to 00:00:00
-	// Using SetHours allows a test to run until the END of the expiry day
-	const startOfToday = new Date().setHours(0, 0, 0, 0);
-	const expiryDate = new Date(testExpiry).getTime();
-	return startOfToday > expiryDate;
-};
-
-export { dateDiffDays, isExpired };