Thanks everyone. I've started in earnest on his outdoor enclosure. We've taken down the raised beds we had, at the end of the garden, where the sunniest spot is. The 1.5 metre "sand pit" frame is here. We've leveled some soil (top soil) and put the frame down. We've got an old wooden box, so have cut a hole in that and married it up with a hole we've cut in the frame of the sand pit and will put some hemp in the box, (ordered today) so Carlos can go in and out so to speak. I've also ordered a glass cloche (which you can have open one end) that he will be able to go in and out of, to put in the sandpit frame. I'm planting some lambs lettuce in the frame too, and lookng out for some grasses to plant in there too. I've got some old roof slates that I've dug into the earth, with the top edge resting against the side, making a "tunnel" type thing for him to go in. I will look for a larger water dish to dig in as well. We popped him in for a bit yesterday afternoon and he dug straight down until the top of his shell was showing.
I noticed a few ants in there (and woodlice) but after reading on here last night I'm not unduly worried about the ants. Does this sound ok??