I worked for a UK based fashion retail business and they always found it blushingly charming when I referred to what they called a 'bum bag ’ a ‘Fanny pack’.

Also, ‘Pardon me!’ Doesn’t mean excuse me in UK English. It’s more an excuse for if you do something disgusting that you are ashamed of, like if you fart or burp.

Correct me if I’m wrong, but that was my take away the couple years I worked with British people.