When we went out, he somehow got out of the room - with a baby gate on the door - where he sleeps. he was very sheepish looking when we got back, but we couldn't see any sign of him having been eating anything.
However he has got more and more almost lethargic, and he is really yelping when we tried to open his mouth, and he yelped before for no apparent reason.
His pet insurance doesn't kick for another 10 days and I have £80 to last until the 19th!