And I have a moral problem.

I ordered the new carpet tiles when I thought the new owners of the last place weren't going to give me the old ones. I would like the old ones in my bedroom, but it has a carpet that is not in a state to be replaced, and I hate to dump stuff that can be used for something. all that rationing waste not want not stuff is heavily ingrained. I wouldn't be able to lift it in one piece, either. (The nice thing about tiles is that they can be laid without moving the furniture to another room, just about a bit.)

I might be able to lay them over the existing carpet - boring grey - but there would be a problem with the door strip.

It's a bit puzzling, actually. New carpets were laid as part of the sale, from the age they appear to be, but the ones they replaced must have been terrible since three were in awful states. One had the sponge back reduced to powder, so must have been decades old, one had mysterious stains that I didn't want to identify, and the one in the bathroom looked OK, but stank to high heaven, and was filthy underneath. (That's already benefitted from the old bedroom tiles.)

Penny