Gromit said:peas, runner beans, cauliflower, cabbage, carrots, sweetcorn, courgettes, leeks, strawberries, onions, shallots, tomatoes, blackcurrants, peppers, aubergines, gooseberries, cucumber, rhubarb, spring onions.
Hopefully I will do a lot better this year.
A suggestion for two more, if you can find the space. Chard (the single most useful all-purpose leaf vegetable) and sorrel (superb flavour, and you just can't buy it).