Can I save a self-seeded tomato plant?

[TeeBee]

I've just noticed that the tomatoes that I have in hanging baskets have self-seeded in a raised growing bed below it. The trouble is, it has only just come into flower. I'm guessing its too late now to start producing fruit as the weather has just changed. What can I do to save the plants? Can I keep them in a greenhouse over winter?

Who knows lots about tomatoes?

think it is too late for them, would never try to keep them over winter as not viable. Bit like courgettes you just have to start again in the spring