Personally putting the UK at the start of the name seems counter productive - it means we'd be way down on the list alphabetically.

Crossfires UK or even Crossfires:UK (if you like exciting punctuation) would be better.

Alternatively, if you want to be at the bottom, but want a better initial letter, XFireUK (or some variant) would be better.

Amanda is in a model horse talking shop which has an over pretentious name for the tasks it does (British Equine Collectors’ Forum) - it jokingly refer to it as “Blimey, Eating Chocolate’s Fun” because that seems to be what a lot of them like to do.

I do like Steve’s idea of a Register - many car groups go under than kind of moniker. Crossfire Owner’s Register could work (COR! - which is what the typical reaction to the car usually is)