I don't think that it is a north and south thing, it's a matter of a good cook.
I come from up north and enjoy my fish and chips, but we have some bad chippies up here as well, I've also had some excellent fish and chips all over the country, both north and south, as well as crap ones.
I once had a list of award winning chippies from all over Britain, that was published in the Daily Mail sometime ago, and my wife and I tried quite a lot of them, while on our travels, and we were never disappointed once. Unfortunately, the list has since been lost.
As a byline, I would like to mention a certain pasty shop in Lizard, Cornwall, called Anne's Pasties, if ever any of tou are down there on holiday, it is a pleasure not to be missed.
Cheers Jonukas