Add Christmas tree promo copy
Add MetOffice promo copy
Add bank holiday promo copy
Add MetOffice link
Add bank holiday link
Add national archives link
Update with National Archives image
Add MetOffice image
Update copy on NA link
Update MetOffice copy
Merge branch 'homepage_promo_16_12'
Homepage promo area using real text.
Fix HTML for slimmer
Named colours
Only hover on the date
Resolve aria description connection
Typesetting the bank holiday homepage notice to marry it up better with the one displayed at the bank-holidays slug
Removed a remaining rogue format type and updated tests accordingly
Merge in homepage promo
Remove whitespace.