Any clues what might be going on here? Just popped the bonnet to change the bulb and spotted it.

The large pipe with the jubilee clip is the air inlet pipe and the clipped joint is downstream of the engine breather. That feeds oil in to the air pipe. So the oil is probably from the joint secured by the jubilee clip.

The PCV system put vents into the air inlet duct from 3 below.


 Jules

I had the AA out at home (as I've got the cover and might as well use it) and didn't want to drive it in case it was a split hose and I caused further damage to it.

He took a look around and the report he emailed over says "No 1 injector seating seal blowing by. Req further attention at dealer".
It was due a major service in the next month or so, so I've booked it in with them to sort it under the extended warranty hopefully.

There are 2 leaks there...
One on the connection of the intake, like people here have told you and one at the injector seal, like AA man told you.