One of the things that has always amused me is when people stand up at clubs, singarounds, etc., and Stanley Holloway monologues such as "Albert and the lion", etc. Nearly all the people I've heard do them have never been without earshot of Lancashire - some of them do it well, others don't. The irony is, of course, that Holloway himself was a Londoner! And I have to say, he only did a very rough "stage" Lancashire accent in the monologues as recorded - but was still hugely successful.