Its the in breeding.

When I left Birmingham I didn't go back very often.

However many years later, I had to do an emergency vist to Brum, becuase my mother was pretty ill. I was living in Amsterdam then.
I flew into Elmdon Airport and got the train from there to new Street.

I had the shock of my life. There was this burly black porter, belting out some orders. I creased myself up in laughter becuase he had the broadest Brummie accent. When I left Brum, they all had West Indian/Jamaican dialects. So it was quite a culture shock to hear him speaking. It was nice to hear it though and I guess I could say he was well integrated. :-) Not sure if he was a Villa or Blues supporter though :-)