Newbie

Welcome DaiWig, full of envy for your polytunnel. I did build a hotbed many years ago (we have lots of horse manure so seemed like a good idea at the time) but it didn’t stay warm so ended up as a compost heap that the squash and pumpkins loved rambling over.

Cheers Muckly
Its an experiment only but seems to be working so far albeit slowly. Dont think the manure was fresh enough but having said that it should hit about 23 deg in 3 weeks (I love data and spreadsheets!) Ive got thermometer probes in the hotbed, the soil on top and the pots above that too, sad I know, see image.
Cheers
DaiWig