Hi Linda,
Carrots, Purple Sprouting, Cabbages, Sprouts and Charlotte Potatoes I'm still harvesting and eating from my garden. The potatoes were planted in late August and we started eating the first ones on Boxing Day. The tops went ages ago but I still have markers so I know where they are. I've heard of others on here planting potatoes in tubs then placing them in the greenhouse.
I'm sure there are many more veg you can grow for winter. Perhaps a quick check through a seed catalogue might give you some more ideas.
Happy Growing.
Lauren :)