Right here's what I've done today.
I cleaned all the oil up that was on the casings, I checked and topped the oil level up (she lost just over 700ml).
I dowsed the engine in talc started her up and waited..........
Here's what happened;
At the rear of the front cylinder
The other side
And the oil pressure switch is damp and oily
I'll be ordering an oil pressure switch, but do you think I'll have to replace the gasket at the bottom where the leak is??