As an American who lives in the UK, here are some of the daily things that you might think are someone being cute but are 100% proper and accepted speech, even in a formal BBC news story:
- Vegetables are just called 'veg'.
- You don't get a shot, you get a 'jab'.
- You say 'whilst' instead of 'while'
- You don't get a turn, you 'have a go'.
- Band-aids are called 'plasters'.
- Many vegetables have different names. Eggplants are 'aubergines'. Cucumbers are 'courgettes'. Pickles are 'gherkins'.
So a headline like "To Promote Veg And Vaccines, Boris Johnson Has A Go With COVID Jab Whilst Eating A Gherkin and Walks Away With A Plaster" is maybe a little silly, but totally proper.
They also write 'Mr Johnson' without the '.' after 'Mr' - and they call the '.' a 'full stop'. Basically it's a real nightmare over here.
tl;dr - You should localize your US software for the UK market if you want to fit in. It's more different than you think. Even street addresses work differently here.