[mrs bouquet]

I thought I would have a change and planted 1 x Alicante.  1 x Summerlast.   1 x Marmande.  Marmande seems to have leaf curl.   It had a bit of blackfly and week or so back, and I sprayed it a a fine w/up liquid with some vinegar in.   Could this be the case of the leaf curl.  Fortunately the others don't have it.   Mrs Bouquet

[Yorkie]

Aphid damage does indeed make leaves curl, so yes it's more than likely that's the cause.

[Hortic]

Yes, the green/blackfly puncture the soft new plant cells and this damage causes distortions in the new growth. Once washed off/killed by the soapy water spray, the growth will come in as normal. Squish the insects first to reduce the population. Little devils can be really thick on the growing tips.

[mumofstig]

Curly leaves on my tomatoes here, as well, but no aphid to blame.
It started after we got a run of 13C  nights after scalding hot days..

Dry weather/under-watering. During hot, dry weather, tomato leaves may curl as the plants strive to conserve water. Regular irrigation can solve this problem, and for greenhouse tomatoes, judicious use of blinds or white window paint can prevent the sun scorching your tomatoes.

https://www.thompson-morgan.com/diseases/tomato-leaf-curl#:~:text=Dry%20weather%2Funder%2Dwatering.,the%20sun%20scorching%20your%20tomatoes.