Having moved house late on in the summer last year I had very little time to sort out anything for the torts so bought a round Keter tub (£37 in B&Q) and half filled it with topsoil and left one panel off when assembling it so they could go in and out when they wanted to. This was placed in the greenhouse. I had a weather station sensor in the tub so I knew what the temps were in there from my house. The torts went in there and buried themselves about mid October. I then bought some Celotex insulation sheets and cut them to fit round the tub like a rectangular box and for added insulation I had a couple of £5 duvets over the top of that. Despite minus 5 temps at times the temp in there did not vary much, it was always above 5 but below 10 even when it was warmer in there.
In recent days it was 45c in the greenhouse but only 11c in the tub. Yesterday I had a look in and dug a bit of soil away and found them both and after leaving the lid off for about 20 minutes their heads popped out
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