I know I haven't had a response about the cats. Now my question is around this 'anti social' guinea pig.
Right, he is in Pets at Home (cue doom music). They have him by himself and say he is antisocial (but great with people). My friend says that he could be the end of a litter and they could be unethically trying to sell him as a single and condemning him to a life of solitary misery. But her chief concern is that there could be something wrong with him and they have separated him because of this.
My DD has only just finished treatment for leukaemia, so the very last thing she needs is something like ringworm.
I just feel so sad for it.

My sensible head is telling me no. My heart is planning where to put the cage and to book a vet's appointment to get it checked out.
I would also be willing to get him neutered if he isn't already and get him a girlfriend, as, from what I've read, many boars can be angry with other boars but happier with a female companion. I can see this ending up as a house with two cages and three pigs...
Any advice would be very, very gratefully received.