If you want to eat a variety of local seasonal plant based foods as part of your diet there are still plenty of options at various times of the year- Kale, mushrooms, strawberries, pears, apples, Brussels sprouts, cabbage, onions, leeks, potatoes, turnips, carrots, wheat, barley, oats, rapeseed oil, peas, beans, sugar beet, celery, celeriac, artichokes, spinach, tomatoes, spring onions, squash, broccoli, parsnips, radishes, water cress, rhubarb, cucumber, asparagus, beetroot, cauliflower, lettuce, berries, shallots, garlic, sweetcorn, pumpkins, loads of herbs and more. Quinoa, courgettes, buckwheat, sweet potatoes, hazelnuts, sweet chestnuts, almonds, walnuts, sunflower seeds and various beans can also be produced in UK it’s just afaik not done to scale yet. You start then.