Ah Claire, I didn;t think of that - the plastic keeping the heat in. We have a plastic Eglu coop for our hens and it works well, but I guess the reason is the plastic is thick and constructed to keep things cool. So I am guessing a solution will have to be found.
Trish&Ewan, we have been debating his on and off all day as some of the solutions seems to create other problems. Eg, putting some edging onto the corners and edges may just create an extra, smaller gap, for food etc to fall into. The only thing we can come up with is to get some rubber matting and place it in with a largish overlap going up the walls (higher than the layer of bedding etc would be), so the whole thing could be lifted out when changing the bedding. But as we have a ramp then this would have to be cut up to include the hole for the ramp. By the way, I have no idea if this makes any sense written down rolleyes
It is hard to line the floor with lino tiles as it is already plastic lined, but the edges are raised (the floor is more like a tray), so the lino tiles couldn't lie flat. We shall keep thinking....