Speaking from greatly limited experience (c. 10 days on a bus tour, 10 years ago), I can say that my experience with British food was mixed. Very few things I loathed (I’m sorry, but haggis and bangers are not my friends!), many I liked, more simply "okay"–much like American food! The one truly outstanding memory is breakfast: grilled tomatoes, bacon, mushrooms, and more. . . . I could have lived on those breakfasts, save for the omnipresent instant coffee!
Overall: Once again, like American (and, I suspect, most national and even regional) food, British food featured "the good, the bad, and the ugly." No major surprises, just a reminder that the world was not custom-designed for my tastes. Maybe we should all remember that.