Well, I popped out and when I got back my partner said "we've got a prisoner...." Unfortunately, we didn't have a clue what to do and the cat bolted through my legs as I was setting up the room so we could figure out a plan of action. After all, I'm assuming it's effectively stealing if the CP have said things are OK within his home environment.
My partner asked what I'd do if the cat forced the microchip cat flap, and I said I'd get the police involved for criminal damage. After all,the man has entered into conversations about this and I have his number listed in my phone (Under ******s owner) so it would be obvious that it was ongoing.