[Walesy]

My idle is lumpy and it does it when it is cold, during the summer it is fine so I take it it's the colder weather that causing it. In the morning I get a slightl blue puff from the exhaust also, only when it is cold.
I took it to the dealer and they said it was totally normal, I even recorded the exhaust on my phone to show them and they said it was normal especially in colder weather (not oil, it's diesel in the cylinder). The idle thing didnt raise it's head at all when I took it to the dealers (typical). But the cars runs fine other wise.

Let me know how you get on, I will be interested to see if I got the brush off.