Yep - not intermittent, always one cylinder. Plugs wet with fuel but spak when I remove them.
Will try swapping leads this weekend but think it's going back to dealer. Was just trying to check that I hadn't done something stupid first and get landed with a large dealer bill but starting to think it may be the belts - how easy are these to check?
Only other thing I can think of is I have 45mm Termi's on with no change to chip - this wouldn't have affected the mapping would it?
Ta for all your help.
D