I'm from Manchester but I had never heard of Manchester tart til I was in halls at university in Cardiff (much hilarity - Manchester Tart, ho ho).
It's very weird - I was talking about the Cookery Year book today, my M&D still have it - I used to peruse it as a child.
My Mum used to make corned beef mummy - bought puff pastry, rolled out into a rectangle, corned beef and fried onions put in the middle third, then the pastry cut in strips on the diagonal and folded over alternately - hence like an Egyptian mummy's bandages. The fat content must have been astronomical - and we had it with home made, chip pan, chips, cooked in lard.
I remember her making her own puff pasrty too - for a dinner party - and choux pastry for profiteroles.