Scottish, lived in France for 20 years now and visiting ‘home’ a couple of times a year usually.
It’s a very different food culture. We didn’t, traditionally, have access to a lot of the staple ingredients that form the basis of Mediterranean cooking. Poor people in Italy and France had access to a wide variety of vegetables and salad ingredients, plus fruit, beans, and olive oil etc. In Scotland we had oats, barley, potatoes, plus cabbage and turnip. That’s not very inspiring.
my friends French DH was teaching they daughter to make a perfect vinaigrette by the time she was 5. No one taught me how to cook perfect turnips at any age.
when turkey burgers, cheese hamwiches and oven chips were invented my mum breathed a huge sigh of relief. As a full time working mum, she found it incredibly hard work getting dinner on the table 5 nights a week - particularly with the normal schedule of dinner at 5:30/6:00pm. In France, we don’t eat until 7:30pm. And the evening meal isn’t usually the main one of the day.
At school in France children are offered a 3/4 course lunch that is completely different to what is normal in Scotland. It is generally cooked on the premises, includes lots of veg, salad and fruit. There are no other options to buy food at school - no sandwiches, no crisps, no muffins, no pies or sausage rolls, no sweets or chocolate and nothing to drunk except water.
Culturally, id also say that the Brits are much more attracted to novelty and trying different things. The French are very conservative by comparison - many people still eat the sane foods that their grandparents did, and the classics are still very present. The typical British pub menu with (highly processed) cuisines from all over the world (an Indian curry, a Thai curry, fish and chips, a couple of pasta dishes, a noodle dish, plus steak, BBQ. Bbq chicken etc etc) just doesn’t exist here. It’s only in the last 5-6 years that pubs serving beer and burgers had really caught on here, the whole informal eating thing has finally taken off - but in a very French way: you are still asked how you want your burger cooked.
another thing: food marketing and the whole ready meals thing is light years ahead in the UK. And processed food is utterly addictive, a treat - and Brits are very, very susceptible to treats, especially sweet, fatty, tasty ones. In France a decent oyster or 6, or a very good piece of cheese is considered a treat.