Well just got a call - aparently it hasn't actually broken after all - but the water pump seized causing the timing belt to jam and come off???
No damage to the engine and they're replacing the pump and doing a new full written report on the engine as they reassemble after re-fitting the timing belt.
Will have her back Friday afternoon... just im time as I had promised it as a Bridal car on Sunday!!!
There IS a God after all - had almost given up on Friday.