i noticed the zed very slightly smoking on tick over (blue smoke) but only did it when on a incline it's ok when on the flat and under normal driving it has done it before after running on boost and parking up quite soon after i will get smoke at tickover but it clears as soon as i driver a little further, did the pcv valves about 850 miles ago could it be some residue left in the pipes causing the problem? or something more sinister?

I had this on mine and it was due to p@ss thin oil getting into the pcv's.Had castrol edge in it thay had broke down after approx 1200 miles and had lost its viscousity.Refilled it with 10/40 semi and it stopped it.After changing the pcv valves it can take awhile to burn off residual oil.did you change the 5 pcv hoses as well?.

done all the hoses apart from the rear one and i have 1 front one to do, oil not that old and not done huge miles it's not a worry at the moment but want to nip it in the bud before it becomes a huge problem