Curled leaves on tomato plant

The leaves on 2 of my Tomato plants have curled up quite alot is this down to insufficient watering ? any info would be gratefully appreciated ..... Chris

 

Curled leaves are common, and not usually a problem.

 

This can be caused by a large difference between day and night temperatures. Mine often get it and It doesn't seem to do any harm.

 

Yeah, I've had that a few times, but never seemed to be detrimental.

 

Thanks all for the info you have put my mind at rest

 

I break them off at the main stem, new ones always reappear to keep the plant going