NHS barcode and action links on /features message channel pages (#106)

All the action links direct to the right pages and understand the rationale for using them instead of inset text or bulleted links.

Content on NHS barcodes is concise and clear.

Good job!

Author: emmagifford

docs/pages/features/emails.md

@@ -20,7 +20,10 @@ Use NHS Notify to send free unlimited emails to patients and members of the publ
 
 ## What you need to know
 
-This page will tell you about our email layout and specification.
+{% include components/action-link.html
+    url='/using-nhs-notify/email-templates'
+    text='Learn how to set up email templates'
+%}
 
 You might also want to understand more about:
 

docs/pages/features/letters.md

@@ -25,7 +25,12 @@ This page will tell you:
 - [our letter specification](#letter-specification)<!-- markdownlint-disable-line -->
 - [what envelopes we use](#envelopes)
 
-You might want to understand more about:
+{% include components/action-link.html
+    url='/using-nhs-notify/letter-templates'
+    text='Learn how to set up letter templates'
+%}
+
+You might also want to understand more about:
 
 - [letter pricing]({% link pages/pricing/letters.md %})
 - [delivery times for letters]({% link pages/using-nhs-notify/delivery-times.md %})
@@ -42,3 +47,9 @@ The page size and layout is A4 portrait (210 x 297mm).
 ## Envelopes
 
 NHS Notify uses C5 size envelopes with an address window. This means the A4 letter is folded in half with the recipient's address displayed in the address window.
+
+### NHS barcode
+
+All letters sent with NHS Notify will automatically have Royal Mail's [NHS barcode (opens in a new tab)](https://www.royalmailwholesale.com/news/nhs-mail-new-barcode-solution){:target="\_blank"} on the envelope.
+
+The NHS barcode allows Royal Mail to identify NHS letters. During busy periods locally or nationally, Royal Mail will prioritise NHS letters using the NHS barcode.

docs/pages/features/nhs-app-messages.md

@@ -24,6 +24,11 @@ Recipients can receive NHS App messages in their NHS App inbox.
 
 [Push notifications](#push-notifications) are generated when recipients have an unopened message in their NHS App inbox.
 
+{% include components/action-link.html
+    url='/using-nhs-notify/nhs-app-templates'
+    text='Learn how to set up NHS App message templates'
+%}
+
 You might also want to understand more about:
 
 - [delivery times for NHS App messages]({% link pages/using-nhs-notify/delivery-times.md %})

docs/pages/features/text-messages.md

@@ -20,6 +20,11 @@ Use NHS Notify to send text messages such as invitations, alerts, notifications
 
 ## What you need to know
 
+{% include components/action-link.html
+    url='/using-nhs-notify/text-message-templates'
+    text='Learn how to set up text message templates'
+%}
+
 You might want to understand more about:
 
 - [text message pricing]({% link pages/pricing/text-messages.md %})