Yes I think the temperatures will be low for the next few nights. George Gray is right and an air temp of 4 degrees could produce a ground frost.
I've got fleece over my beans (yes, yes, I know I could have planted them a fortnight later, but what is one to do with itchy planting fingers - and I usually get away with it).
Anybody with toms or cucs in the greenhouse should cover them or put the heating on.
Good luck everybody.

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From each according to his ability, to each according to his needs.