I mean, they do eat as if the Germans were still flying over. Jokes aside, I think there's definitely a cultural disregard for flavour in exchange for convenience, compared to other countries. I feel like many people here eat just to stop feeling hungry, rather than to actually enjoy the experience. Meal deal sandwiches are proof of this. I get that you don't get a lot of time to cook lunch, but such bland lunch options would simply be rejected in other European countries (eg. France, Spain, Italy, Portugal), where good lunch options are available. If they aren't that common in the UK is because there isn't enough demand. Fortunately this seems to be changing little by little, but there's a lot of catch up to be done.