Thankyou for the welcome and sorry for being blunt. Since the last post the engine has been removed and I have found a wear line in the rear cylinder bore and a mark on the piston which I don't believe is associated with the light sporadic rattle I can hear. The bottom cam belt pulley wheel spins on two bearings one being a 6003 deep grove bearing which is notchy which I will replace everything else looks very good though the engine has evidence of being stripped previously. I've got to source now the rear cylinder and piston then will continue the rebuild. Anyone with a Mivv exhaust system for sale I would be interested.