It largely depends on where you go, and where you eat. It's kinda like saying that I hate American food because I only visited Seattle and ate at shitty shrimp places.

It also depends on what you refer to as "British food". It's essentially comfort food, so you won't find many places trying to do the gourmet version of it without busting your wallet open. The great thing about food in the UK is that you can get food from basically all cultures everywhere (if you're in a city).