stuart noble wrote:
Not bad conditions for concrete actually (warm and wet), but I'd cover
it with plastic sheeting for 24 hours.

Thank you, both (stuart + Nick).
COmments passed on, day off booked for tomorrow, I'll let you know how it
goes :-)
(probably on the allotment/gardening blog and post the link one day when it
eventually gets more than 1 post in it!)