Jus did a full service and found this!!!

[navmk4gti]

what i think it is, someone in the past filling the oil up has slipped and its poured down, not been cleaned and gunked up.

No mate cant be that as oil was fresh
Its narrowed down to rocker gasket. Not an expensve part change thankfully so will be doing that and hopefully that should solve it 

[xxChrisxx]

I suspect your rocker cover gasket is leaking

This. Mine was the same. If your still worried do a compression test on each cylinders.

Mine had no smoke, ran perfectly happily (bit rich due to a boost leak I can't find, and I suspect the PCV is clogged a bit) Which suggests nothing catastrophic is wrong. If a ring had gone you'd know about it.

[Wazzzer]

mine was the same, have a look through my project thread

[navmk4gti]

So what you sayng chris and wazzer wont need change gasket

[houston]

what i think it is, someone in the past filling the oil up has slipped and its poured down, not been cleaned and gunked up.

No mate cant be that as oil was fresh
Its narrowed down to rocker gasket. Not an expensve part change thankfully so will be doing that and hopefully that should solve it 

good point.

[Wazzzer]

I changed the rocker gasket as mine was leaking oil down the back of the engine too

[navmk4gti]

If it is leakin is it ok to drive as i cant get it sorted till sometym next week