Prudie, I think the wholesaler or Aunt Bessie's has refused to meet Tesco demands for a cheaper price for their products.
It seems quite a few previously stocked brand names are no longer on the shelves at Tesco.
I was going to add in case some chef type picked me up on it - an Aunt Bessie pancake in the microwave for 2 minutes is the nearest to the real thing you'll ever get - without flour all over the worktops, smoke in the kitchen, loads of washing up etc etc