Thanks,
I will re-fit the factory PCV then.

"" If instead you are only seeing water/oil mixture on the underside of the oil cap, that is a condensation problem,""

Its not just on the cap, its more like a half cup right through the valve train and underside of the rocker cover.
It doesnt really get taken on small trips. At the mo its running a A12 radiator till i get the N14 one that i have all set-up. The A12 rad seems to be working ok in the mean time, Ive fitted a (pricey) after market water temp set-up in the top rad hose and the gauge stays around 74 degrees and has never gone over 78.

I was thinking of fitting an after market air cleaner at some stage, in that case I would have to move to a catch tank system- would that be prone to the same condensation probs im getting now?

Thanks again