Thanks for the replies (and I need obvious to be certain I'm being as safe as is possible with this method! ) I was thinking to run the cable through conduit to avoid the squirrel issue (along with training my dogs to chase the little b*&Sards out the garden as they keep stealing the crops!), an...

Apologies for resurrecting an old thread but it was what appeared in my search! all sounds very much more technical than I can do, and no money to pay for it to be done for me; is it totally idiotic and life threatening to run an exterior extension lead into my greenhouse for a few months to run my ...