Tomato leaves corkscrewed

I have been growing tomatoes in my greenhouse for many years, but this year I grew Shirley and Ailsa Craig tomatoes as last year I had a bad year with Moneymaker.
The Shirley are growing well, but the Ailsa Craig, although growing and flowering as normal, have developed tightly corkscrewed leaves from half-way up the plant.
I have not come across this before and cannot find an answer in my gardening books.

Any answers please!

 

Hi
I always thought change of temperature from hot to cold which we have had , if am wrong it will be intresting to find out

Spruce

 

Down at our alottments I have for the last few days been watering the toms in a greenhouse for a plot holder whilst she is away. Her toms are the same and I expect cold to be the problem as she leaves the vent open 24/7 and some overnight temps recently have been as low as 5 degrees C.

Steve...

 

Funny you should ask this as this very problem was discussed on Beachgrove Garden on the telly last night. Spruce and Steve R are right it is down to the quick changes in temperature and apparently does the tomatoes no harm at all, so nothing to worry about.

 

I as John ,have noticed before that leaves sometimes curl when they get that first feed . Maybe coincedence ??
Dave