A good selection of breakfast rolls with decent bread and good quality bacon / sausage. I have had a bacon and egg roll in two cafes recently, one of them used a ciabatta roll with loads of hot, salty bacon and a perfectly fried egg, it was amazing. The other used a soft, tasteless bap and the bacon was fairly tasteless too, won't be rushing back but the first one I went straight to Trip Advisor and gave it a great review (it also met my tea requirements, see below)..
Big pots of tea and proper mugs, none of these tiny china bowl shaped cups where the tea has gone cold within a minute of pouring it and the pot barely makes two cups full.
No to soup, just no interested. Sandwiches with good quality ingredients on good quality bread (not sourdough unless toasted). Chips available as a side but not as the default so you end up paying for them when you don't want them.
I love a Ploughman's lunch, really good quality cheeses and pickles, not too fancy,
I'm another who says no to butter because of the risk of it being margarine. Yuck. Use real butter and make it clear you are doing so.
Homemade cakes and bakes, not too large portions. Make it clear they are homemade, if I think they aren't I won't order.