I do my best to eat seasonal veg grown in the uk. It can done. I have a very small garden and have chosen not to grow grass. I am self-sufficient in apples, gooseberries, blackcurrants, blueberries and strawberries. I also have 4x 1m beds in rotation, to grow salad potatoes, dwarf beans, carrots, purple sprouting brocolli, brussels sprouts, shallots, beetroot, lettuce, radish. I grow asparagus amongst my apple trees, roses and sedums. On the patio I have many troughs of the pink and red flowered strawberries, instead of annuals. I grow many herbs in a veg trug and have areas ready for tomato plants in growbags and also courgettes and mini cucumber in growbags
The roses, sedums, hellebores, echinaceae, heleanthemums, lavenders, pinks, 2 small rowan trees and ornamental grasses add colour and attract bees and birds. All this and a water feature for me and birds and insects, in my small potager garden. Yes we can grow much of our food, it just takes a willingness to do it.