diff --git a/app/views/examples/example_radios_checkboxes.html b/app/views/examples/example_radios_checkboxes.html
index 7f034c104..ffbdba7d1 100644
--- a/app/views/examples/example_radios_checkboxes.html
+++ b/app/views/examples/example_radios_checkboxes.html
@@ -35,7 +35,7 @@ <h1 class="heading-large">
         <div class="form-group">
           <fieldset>
 
-            <legend class="visuallyhidden">What is your nationality?</legend>
+            <legend class="visually-hidden">What is your nationality?</legend>
 
             <label for="nationality_british" class="block-label">
               <input type="checkbox" name="nationality_british" value="British" id="nationality_british">
@@ -69,7 +69,7 @@ <h1 class="heading-large">
         <div class="form-group">
           <fieldset>
 
-            <legend class="visuallyhidden">
+            <legend class="visually-hidden">
               Where should we send your new passport?
             </legend>
 
@@ -91,7 +91,7 @@ <h2 class="heading-medium">
 
               <fieldset>
 
-                <legend class="visuallyhidden">
+                <legend class="visually-hidden">
                   Your other address
                 </legend>
 
@@ -101,7 +101,7 @@ <h2 class="heading-medium">
                 </div>
 
                 <div class="form-group">
-                  <label class="form-label visuallyhidden" for="address-line-2">Street</label>
+                  <label class="form-label visually-hidden" for="address-line-2">Street</label>
                   <input type="text" class="form-control" id="address-line-2">
                 </div>
 
@@ -132,7 +132,7 @@ <h1 class="heading-large">
         <div class="form-group">
           <fieldset>
 
-            <legend class="visuallyhidden">
+            <legend class="visually-hidden">
               Which part of the Housing Act was your licence isued under?
             </legend>
 
diff --git a/app/views/snippets/form_checkboxes.html b/app/views/snippets/form_checkboxes.html
index 84c580172..cd3f7118f 100644
--- a/app/views/snippets/form_checkboxes.html
+++ b/app/views/snippets/form_checkboxes.html
@@ -4,7 +4,7 @@ <h3 class="heading-medium">Which types of waste do you transport regularly?</h3>
 <form>
   <fieldset>
 
-    <legend class="visuallyhidden">Which types of waste do you transport regularly?</legend>
+    <legend class="visually-hidden">Which types of waste do you transport regularly?</legend>
 
     <label class="block-label" for="waste-type-1">
       <input id="waste-type-1" name="waste-types" type="checkbox" value="waste-animal">
diff --git a/app/views/snippets/form_inset_checkboxes.html b/app/views/snippets/form_inset_checkboxes.html
index a1af06b8b..d55463c21 100644
--- a/app/views/snippets/form_inset_checkboxes.html
+++ b/app/views/snippets/form_inset_checkboxes.html
@@ -9,7 +9,7 @@ <h1 class="heading-medium">
   <div class="form-group">
     <fieldset>
 
-      <legend class="visuallyhidden">What is your nationality?</legend>
+      <legend class="visually-hidden">What is your nationality?</legend>
 
       <label class="block-label" for="nationalities-british">
         <input id="nationalities-british" name="nationalities" type="checkbox" value="British">
diff --git a/app/views/snippets/form_inset_radios.html b/app/views/snippets/form_inset_radios.html
index 40311792d..35639ccf1 100644
--- a/app/views/snippets/form_inset_radios.html
+++ b/app/views/snippets/form_inset_radios.html
@@ -6,7 +6,7 @@ <h1 class="heading-medium">
   <div class="form-group">
     <fieldset>
 
-      <legend class="visuallyhidden">How do you want to be contacted?</legend>
+      <legend class="visually-hidden">How do you want to be contacted?</legend>
 
       <label class="block-label" data-target="contact-by-email" for="example-contact-by-email">
         <input id="example-contact-by-email" type="radio" name="radio-contact-group" value="Yes">
diff --git a/app/views/snippets/form_radio_buttons.html b/app/views/snippets/form_radio_buttons.html
index 417828db3..5c3ecb272 100644
--- a/app/views/snippets/form_radio_buttons.html
+++ b/app/views/snippets/form_radio_buttons.html
@@ -4,7 +4,7 @@ <h1 class="heading-medium">Where do you live?</h1>
   <div class="form-group">
     <fieldset>
 
-      <legend class="visuallyhidden">Where do you live?</legend>
+      <legend class="visually-hidden">Where do you live?</legend>
 
       <label class="block-label" for="radio-1">
         <input id="radio-1" type="radio" name="radio-group" value="Northern Ireland">
diff --git a/app/views/snippets/form_radio_buttons_inline.html b/app/views/snippets/form_radio_buttons_inline.html
index 914ee483a..fdb68c3e3 100644
--- a/app/views/snippets/form_radio_buttons_inline.html
+++ b/app/views/snippets/form_radio_buttons_inline.html
@@ -6,7 +6,7 @@ <h1 class="heading-medium">
   <div class="form-group">
     <fieldset class="inline">
 
-      <legend class="visuallyhidden">Do you already have a personal user account?</legend>
+      <legend class="visually-hidden">Do you already have a personal user account?</legend>
 
       <label class="block-label" for="radio-inline-1">
         <input id="radio-inline-1" type="radio" name="radio-inline-group" value="Yes">
diff --git a/app/views/snippets/form_radio_inline_yes_no.html b/app/views/snippets/form_radio_inline_yes_no.html
index d73c2f5d7..e3d2ca844 100644
--- a/app/views/snippets/form_radio_inline_yes_no.html
+++ b/app/views/snippets/form_radio_inline_yes_no.html
@@ -6,7 +6,7 @@ <h1 class="heading-medium">
   <div class="form-group">
     <fieldset class="inline">
 
-      <legend class="visuallyhidden">Do you yes/no?</legend>
+      <legend class="visually-hidden">Do you yes/no?</legend>
 
       <label class="block-label" data-target="yes-and-do-next" for="radio-yes-no-yes">
         <input id="radio-yes-no-yes" type="radio" name="yes-no-group" value="Yes">
diff --git a/app/views/snippets/typography_legal_text.html b/app/views/snippets/typography_legal_text.html
index a84badecd..a9216b7f0 100644
--- a/app/views/snippets/typography_legal_text.html
+++ b/app/views/snippets/typography_legal_text.html
@@ -1,6 +1,6 @@
 <div class="notice">
   <i class="icon icon-important">
-    <span class="visuallyhidden">Warning</span>
+    <span class="visually-hidden">Warning</span>
   </i>
   <strong class="bold-small">
     You can be fined up to £5,000 if you don’t register.