How about some Lancashire Hot Pot (A Grand Day Out)?
I hope that, in A Matter Of Loaf And Death, W&G's bakery will have plenty of Hovis brown bread (eeeh, by 'eck, were a greeet baker. He'd teck 'is bread to the top of the world....) Eccles Cakes, Manchester Tarts, Barm Cakes...
Wheeew, spain! I could add corned beef hash and red cabbage - but they are not in any of the films. Bury black pudding (oh, aye! He mentions black pudding in The Wrong Trousers - but didn't say whether it was from Bury or not!)...
Porridge was mentioned...and real porridge was used in A Close Shave when the porridge-o-matic went belly-up.