thank you for the words of wisdom Alice. I'm going shopping on Thursday so will invest. Many thanks.
I've double wrapped my seedlings under the (window) cold frame tonight, hope that will keep them safe.

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Regards, Jane
What sane person could live in this world and not be crazy? The creative adult is the child who has survived.
Ursula LeGuin
http://www.etribes.com/madderbat