Hi Andy
Long time since i was on the senny forum saw your posts quite a lot .I did say to biged that it may be the oil gallery and what it would need to fix just hope the leek area can be found you can eye ball it as the block will show signs where the oil has run down sort of clean .I had this on another senny just a pain in the backside if you hate oil drips.
The Yahoo forum?
As said I lived with it for a while till the water way failed & my hand was forced.
Luckily at the time I had a garage I could get my car into, now I don't
. I did the Senator's head one January and just so I could keep my hand in, SWMBO's Hyundai decided to burn TWO valves out a couple of months later. Apparently they often did that! :-?