Because the Home Nations just can't abide each other enough to do that!
There was an exception for the London Olympics UK football team because we enter the Olympics as the UK, but it didn't capture the public's attention.
Xiaomi Officially Launches In The UK
Artists FriendsWithYou reimagine Snoopy and Charlie Brown for a Peanuts London takeover
iPad Pro 12.9in (2018) review
Les meilleurs smartphones chinois disponibles en France