I think you are getting real life mixed up with fiction.
Yes, Ricky spent a lot of his life in Liverpool (Born in Blackpool) however, he is an actor
playing a part in a Manchester sit-com, written for him by two Mancunians, he plays the part as it's written, like all actors will.
Do you think that the London born actor Warren Mitchell is really just like the bigot and racist Alf Garnett that he played so well, if so it did not throw a good light on Londoners.