Timing advance
Sorry to butt in but did they not mark it with paint afore they destroyed your beloved? Have you pulled the cover back to have a look? Could be a simple way to resolve?
Actually no that's ******** as you have run it! Damn my brain!!!!
There is a mark on the Timing belt pully that should match with one on the oil seal housing. To get number 1 to TDC
Mark crank possision. Get a disc of card that turns with the crank and a pointer that stays stationary.
Turn 10 degrees clockwise, Make another mark, Turn back through 20 degrees, turn forward agoin so your in line with the first mark, mark again. now the science, find the exact centre and make your third mark, turn the crank back through 20 degrees, turn forwards until the centre mark lines up with your arrow. The cam shafts should be kept still with your tool at all times. Think toy can buy them for about 20 quid?