Yes, that's the conclusion I'm arriving at - rough running indicates to me that the oil or fuel causing the issue is pre or in cylinder, rather than post.
@prj, is lambda used on cold start or does it have to warm up before it's used? If it does, then what is the time scale of that happening?
One think that does stick in my mind is that on a track day, the car was left idling when very warm for a period of time and when it drove off (my Dad was driving, I was watching) there was some blue smoke coming out the back for a few seconds. This is the only time it's done this. The breather is all custom and should be removing almost all of the oil vapour and all of the liquid oil (unlike the stock setup!), so I would conclude that the oil was getting in through another route, perhaps guides, rings or seals. As there is no smoke under load or on over-run, this makes things a bit less clear.
As ever, timing isn't ideal
I'm starting a new job next week, so pulling the head off the car is a no-go for a while I see that there are very few things left to check before this becomes the only investigative route remaining.
Remind me why I don't have a sensible car... because 
@prj, is lambda used on cold start or does it have to warm up before it's used? If it does, then what is the time scale of that happening?
One think that does stick in my mind is that on a track day, the car was left idling when very warm for a period of time and when it drove off (my Dad was driving, I was watching) there was some blue smoke coming out the back for a few seconds. This is the only time it's done this. The breather is all custom and should be removing almost all of the oil vapour and all of the liquid oil (unlike the stock setup!), so I would conclude that the oil was getting in through another route, perhaps guides, rings or seals. As there is no smoke under load or on over-run, this makes things a bit less clear.
As ever, timing isn't ideal
I'm starting a new job next week, so pulling the head off the car is a no-go for a while I see that there are very few things left to check before this becomes the only investigative route remaining.Remind me why I don't have a sensible car
... because
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