Thanks to all of you for your comments and advice.
We just got home from the vets. She said it looks like mild cat flu symptoms. But they're fine.
Rocky is slightly underweight. The vet said it could be that he was born with worms or was the runt of the litter, but should fill out. I think so too as he does eat well. Sapphire was a good weight and size.
They had another vaccination, were microchipped and had worming tablets.
Rocky was a bit of a drama queen when it came to the taking the tablet and being microchipped. He struggled and squeaked. lol. Sapphire was good.
They're now home and happy as ever playing with their toys so all in all wasn't too stressful for them (or me!)
