Hard coded links in header for UKVI

Relates to https://www.pivotaltracker.com/story/show/67911210. This is a temporary solution and should be refactored if more orgs request this feature. Ideally we should move it out to an actual attr instead of having a big messy hash in the org model. Currently a WIP as my VM is broken and this needs double checked that the UKVI page works before merging.