Evening.
I have done the following ;
Undid the dipstick bolt, tugged the tube, put it back , retorqued
Retorqued the cam cover bolts
Cleaned the engine block/sump up as best as I can.
I then ran the engine upto temp this afternoon, water was warm ( 90degC upto 96degC at one point due to being in my garage ) and oil was indicated 65-67degC and running 32psi idle and around 72psi when I was revving and holding to 7k RPM.
I inspected the sump , and all around and got warm fingers so I left it a few hours.
I have identified what I think is the leak. Its what I can only describe as a blanking bolt in the sump. It appears to be weeping from the copper washer thats just infront of the bolt. A found a drip there , and only there. It would make sense as the bolt is at the lower part of the sump, where its angled down and forward and the oil would run.
My son was out with me and he was checking everywhere and that is all we can come up with.
Picture of the offending bolt on my 3500l sump ( I am being factious , its just a massive sump )
I do not plan on doing an oil change for around 9 months , so I might bodge it with some RTV for now and look for a more permanent solution when I have the oil out.
Ill put the trays back on the car and if it leaks like mad again Ill , well , I dunno!