I love how she doesn't even know that she means a British Accent, not Dialect. And since when did Britatin have just one accent??? Let's explore that idea, shall we?
Cockney (London - origin of the Australian accent, probably)
Yorkshire - quite frequently divided from one valley to the next. Someone in Barnsley sounds nothing like someone in Bradford, although they're just 30 miles from each other.
West Country - places like Cornwall, Devon, etc.
Welsh - divided into broad and standard
Scottish - comes in huge variety! Particularly from Glasgow, where it's entirely unintelligible.
Newcastle area
Manchester area
Liverpool area (Scouse)
Kent area
Ireland
Recieved Pronunciation (RP - spoken by the Queen).
And each one of these subdivides MANY times. Fail.