I'd started them off in the integral garage, where the temperature didn't go below 10 degrees C. I'd intended to move them out into the garden after a week or two, but it's been so cold I've kept them indoors and put a temperature sensor inside. I've made the following observations:
10-12 degrees: sleeping
12-14 degrees: not doing much
14-16 degrees: munching happily
16-18 degrees: having babies!

Now I think I'll keep them indoors permanently. They are excellent lodgers - they don't smell at all (well, just a smell of fresh earth), they don't get drunk and smash your place up, they don't talk about politics. In fact they don't make any sound at all, only a faint whispering sound when they're really busy. I love them to bits.
