Myriade-- we produce a lot more fruit and veg than carrots and parsnips.
Potatoes, cauliflower, brocolli, tenderstem brocolli, purple sprouting brocolli, corn on the cob, swede, asparagus, curly kale, various types of cabbage, Brussel sprouts, peas, runner beans, green beans, onions, spring onions, apples, pears, apricots, rhubarb, plums, blackberries, etc etc. I could go on...... Some of the above is imported as well, and is seasonal but I always buy British when I can.
Who wants to buy tasteless strawberries and cherries from Spain when they're out of season in this country, just because we can.