I'll accept many British people (including my mother) fail to season their food, and overcook things.
But, the quality of the raw food is comparable to elsewhere in Northern Europe, and low-processed foods like cheese, canned tomatoes, cream, milk and so on are European (i.e. no additives, no sweetener etc) rather than American.
I agree that we cannot compare Northern Europe to the Mediterranean, but take Copenhagen for example. Same (and even worse) logistics to get good produce, but you can find acceptable food both in grocery stores, and a quality restaurant culture for the average restaurant.
And it's not like the Danish had a cuisine traditionally, all they ate was pork and potatoes due to the geography.
But, the quality of the raw food is comparable to elsewhere in Northern Europe, and low-processed foods like cheese, canned tomatoes, cream, milk and so on are European (i.e. no additives, no sweetener etc) rather than American.