Rosella's just reminded me to post an update
Mog went to the vets this morning to have his stitches removed and the vet is happy with him.
Mog is happily eating his own biscuits and has started complaining loudly about being left in his pen too long as I have been letting him wander around the last couple of days.
He's not too keen on the other cats and doesn't move around a great deal but can and does when he wants to.
So I guess its just a bit of body building for him now