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To pad out the answer with what I did to rectify things. I just propped them up a bit and they seems to be happy now. They some rain to help water them in further. It was quite windy today but not raining so I will wait and see if they stay upright.
Thanks for the advice. There were much smaller than they are now when planted out but probably not at just 4 leaves. Anything I can do now? I guess take them up until the roots expand more?
An update on the plant. It made it through the season, was perhaps a little smaller than the other plants in the greenhouse but it cropped well despite the strange leaf shapes. I might try to grow some seeds from it to see if it repeats next year, but I do not know how tomatoes behave seed wise. Another question!
@Shule I think it looked a little droopy when I got it, like the other two that now look fine did. I am confident the leaves did not look this shrivelled. As it has looked like this from the start, it could have been underwatered before I purchased it as a young plant. It was from the same place as the other two tomatoes that seem to be OK. I would assume it received similar care and watering.
I did have a little look around before posting this without finding a similar looking problem. Then in the sidebar this question popped up: gardening.stackexchange.com/questions/33847/… Looks quite similar. Perhaspe root damage and I should lift it out to check?