I pretty much agree with little red one, and I don't know why I'm responding to a tomato question in December. Too little, too late. Leaf curl is nothing to worry about in itself. Dark spots are another issue. Tomatoes, being of the same family, are susceptible to potato blight. Dark blotches on the leaves are the first sign of this. There is nothing you can do. Rip the plant out before it spreads.
But if the leaves are healthy, and curling a bit, are there some bluish tinges on the margins? If so, they are cold. Simple as that, and not much you can do about it.
But often, curling leaves suggest whitefly, which is the bane of indoor tomatoes, whether in a polytunnel, greenhouse or conservatory.
Don't be put off and try again next year. Green tomato chutney, I am told, is quite nice. And aphids add protein, albeit in very small quantities.
There are neither rights nor wrongs in gardening. Only experiences.
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