Hi Johnny,
You can grow tonnes now(or at least get them started)
Cabbage, carrots, peas, lettuce, cauliflour, broccoli, onions, garlic, sprouts in winter - the list is endless. Just check the seed packet for that particular variety.
I can highly reccommend the book 'grow vegetables' by alan buckingham and jo whittingham from DK press (it covers absolutly everything you'll need to know)
Post and let us know your results, I'm in South Lanarkshire & hope to have my tunnel going by next year (still saving for a cover !) so it'll be good to know how you get on.
Hope this helps and good luck,
Karen
.