[BaggyBomber]

The eastiest and cleanest answer would be for JP to sharpen his pencil and cancel JM's contract and issue him with a P45.
Don't need the hassle he brings to he table.

Yes, we're certainly on the horns of a dilemma.  I can't see that I'm ever going to feel comfortable with this client and I would imagine others feel the same.  Do his actions constitute breach of contract?  Dear God, our only signing this window.  You couldn't make it up!