You don't always see the problem fixed in the fora so to update my low oil pressure problem...I fitted a new pump and whilst so doing I noticed that the big nut which secures the oil pick-up pipe was only finger tight. The problem is now cured. Looking at the old pump I don't think it was that...

Hi I have the same problem - replaced the big ends and mains - showing copper like yours - no improvement. Cam bearings are in place, I checked via the removable plate on the crankcase. Did you ever solve it?