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snap! see link
I know you can grow potatoes in bags in the GH as I have just got mine, hopefully they will be ready for Christmas
Also salad, as pointed out, again I will be growing that. This is my first full winter with the GH so I will be interested to see what I can grow, it's exciting
If it looks like getting really cold you can partition off some of it with bubblewrap to keep it a bit warmer.
If you have peppers (sweet or chilli), I've heard it said (probably here) that they're perennial and as long as you can keep the frost off them they'll survive the winter...