You can try:
Radishes, spring onions, carrots and turnips (as 'baby' veg), loose leaf lettuce.
If you have the light and the room, you could try starting off tomatoes at the end of December. They don't need high light levels to germinate, just the correct temperature. After that the temperature can be reduced but you need good light or they'll get leggy. You can grow them on successfully with supplementary lighting.