Toogles additional banner

https://trello.com/c/u4L3Xoet/278-waiting-on-confirmation-switch-off-the-emergency-banner-message-area

app/views/notifications/_global_bar.html.erb

@@ -10,6 +10,9 @@
   # If true, banner is always_visible & does not disappear automatically after 3 pageviews
   # Regardless of value, banner is always manually dismissable by users
   always_visible = true
+
+  # Toggle additional banner
+  show_additional_banner = true
 
   global_bar_classes = %w(global-bar dont-print)
 
@@ -60,25 +63,27 @@
         </p>
       <% end %>
     </div>
-    <div class="global-bar-additional global-bar-additional--show">
-      <div class="global-bar-additional__text govuk-width-container govuk-grid-row">
-        <%= render "govuk_publishing_components/components/govspeak", {
-        } do %>
-          <div class="global-bar-additional__text-govspeak govuk-grid-column-two-thirds govuk-!-padding-0">
-            <p class="govuk-!-margin-bottom-1">Coronavirus guidance is being updated.</p>
-            <p class="govuk-!-margin-top-0">Read <a href="/government/publications/coronavirus-outbreak-faqs-what-you-can-and-cant-do" class="govuk-link">what you can and cannot do</a></p>
-          </div>
-        <% end %>
-        <%= render 'notifications/covid_logos' %>
-      </div>
+    <% if show_additional_banner %>
+      <div class="global-bar-additional global-bar-additional--show">
+        <div class="global-bar-additional__text govuk-width-container govuk-grid-row">
+          <%= render "govuk_publishing_components/components/govspeak", {
+          } do %>
+            <div class="global-bar-additional__text-govspeak govuk-grid-column-two-thirds govuk-!-padding-0">
+              <p class="govuk-!-margin-bottom-1">Coronavirus guidance is being updated.</p>
+              <p class="govuk-!-margin-top-0">Read <a href="/government/publications/coronavirus-outbreak-faqs-what-you-can-and-cant-do" class="govuk-link">what you can and cannot do</a></p>
+            </div>
+          <% end %>
+          <%= render 'notifications/covid_logos' %>
+        </div>
 
-      <div class="govuk-width-container global-bar-dismiss-wrapper">
-        <a href="#hide-message"
-          class="<%= dismiss_classes.join(' ') %>"
-          role="button"
-          aria-controls="global-bar">Hide message</a>
+        <div class="govuk-width-container global-bar-dismiss-wrapper">
+          <a href="#hide-message"
+            class="<%= dismiss_classes.join(' ') %>"
+            role="button"
+            aria-controls="global-bar">Hide message</a>
+        </div>
       </div>
-    </div>
+    <% end %>
   </div>
   <!--<![endif]-->
 <% end %>