Calamity Cat update:
The limping has definitely lessened and I can now pick him up without him wailing at me and crawling over my shoulder. He can push down with front and back legs, (I didn't make him, I turned it into a game.
) but he did squeak when I touched on his belly somewhere. I can't see anything though, so the vet nurse that answered the phone at the vets has advised observation for a couple of days. I think it's the best bet, so will adhere to the advise. He was well enough to play bed mice with my partners feet this morning, so he can't feel too bad.