What EnempE says is true... there is a huge number of different accents in the British Isles... I do speak English but I was once approached by an Irishman and couldn't make out a word of what he was saying.... and I later learned that he was just asking what my name was!!! With a little bit of background noise and concentration lacking, English spoken by Scotsmen, Irishmen and Welshmen is basically unintelligible if you're very used to the American accent. Worse with the Welshmen, who actually sometimes speak Welsh...