After the charger went back twice to OCD with an oil leak from the seal behind the pulley (the second time took 5 weeks!) an investigation was in order. Not wanting to take the whole car there as he wanted, the charger was stripped at home. First thing noticed was the 3 chunks broken off the timing belt cog!
The reason for the leak was blindingly obvious - check out the massive amount of pitting on the sealing surface of the oil slinger.
If he'd actually looked at it on any of the 3 occasions when he had it in bits he could have told me I needed a new one and saved us both unnecessary ball ache. I know plenty of people have been satisfied by his service in the past, but in my case it has left me feeling a little disappointed. Anyways, a new oil slinger and seal went in and its finally leak free!
Borrowed charger can now go back to its owner and spare charger can go into storage.