I have got in the pit under the car and wiped the sump top and bottom. I cannot see the half moons either from below or above, they are right under the scuttle drain. I have tried with a mirror on a stick, but there is no access.
I left the car idling for an hour, and there was little oil on the floor. After a 15 minute drive, then parking the car in the garage, there was more oil on the floor. Sump appears to be still full, so it is not an enormous leak.
I wonder if my failure to apply sealant around the half moon area explains the leak.
At the moment the two big fat hoses from the breather box to the breather top do not have hose clips, they are just pushed all the way on. Probably irrelevant, I just mention it.
Please keep the thoughts coming, chaps.
I aim to buy some more black sealant on Friday at Trowbridge. I might take the car apart again over the weekend, though daughter is bringing home her 2.6 for MOT tomorrow.
It is frustrating because I have changed cam cover gaskets on left hand side before with little trouble