Posted: 08/04/2015 at 18:02
If you can get your dalek somewhere that gets the sun even in the winter, you'll find the black plastic is surprisingly effective with temps, even when I had snow, the tops had snow on but around the base there was little to none, so it seems the temps stay a bit higher. I can't believe you haven't got an access door on yours? If you haven't, it'd be fairly simple to make one by cutting out a hatch, and using the cut out side of an old bucket or something, then use a couple of stakes to keep the hatch shut.
Having said that, it is fairly straight forward to build a compost bin that is very attractive and has easy access. (Basically the slats that make the front wall can be lifted out)There are loads of youtube vids on this, there's a particularly nice plan of one in alan titchmarshes 'how to be a gardener' book too. His actually looks like a dolls house!