Accent, vocabulary eg.Highway/Motorway, Sidewalk/Pavement etc, pronunciation and stress of certain words eg. tube, aluminium and general differences in grammar and use of verbs, for example here in Britain we use 'have' a lot where the Americans use 'take', eg. 'have a shower'/ 'take a shower'. Here are some websites that give longer lists of differences: http://www.hintsandthings.co.uk/library/words2.htm http://en.wikipedia.org/wiki/American_and_British_English_differences Hope that helps :)