Yeah, as kilowatt said above, it's very much dependant on the region. Between the UK and the different countries that form it (e.g. Wales, Scotland, England, and Northern Ireland) and the counties between them (e.g. Greater London, West Midlands, Yorkshire, etc) all have massive differences in some words that are used.
There's obviously just key British terms that get used and the differences between US and UK language (e.g. sidewalk and pavement) that you can slip in. I, for example, spend an awful lot of time correcting mistake in my RP (before pressing enter) of replacing words when the word I am using is the British equivalent.