[QUOTE
David W EEE Roberts wrote:[color=blue][i]
Despite the grotty cold weather my last couple of tomato plants seem to be
surviving in the cold greenhouse and they are still slowly ripening
tomatoes - presumably when the greenhouse warms up on sunny days.


Has anyone ever overwintered tomato plants (or cuttings)?



[/quote]

There has been a long discution about this on:
but as it tends to be an USA dominated site it's not particular relevant to here, but some there do but with lots of light and heat. Not economic by the sound of it, much cheaper to buy what you need.