Yes, the majority of British white food is terrible. They do not care about their food.
There are exceptions though, as mentioned already in this thread; Fish & Chips and full English breakfast.
I co-sign Pie & Mash from the proper South London places as well.
My ex-gf (and most people Caribbeans) with would change up the full English to make more flavoursome. We do not eat pork so you find alternatives for bacon and sausages, season the beans, grill real tomatoes not that tin fukkery, add plantain ackee or dumping, scramble the eggs or at least make sure that yolk is cooked. It was glorious. No room for black pudding on that plate