I spoke to my English friend last night and she tells me that the difference is in the crust. A shortcrust makes it a Tart and a Puff Pastry makes it a pudding. Recipe I looked at wanted 4 hours to make the puff pastry from scratch, a good book was one of the ingredients for the waiting time while the dough chills between layers or whatever is involved. Is there a frozen version that would line a little 7 inch pie plate? I seldom go into that part of the store but will look around today while I'm marketing.