Thanks - Air filter was changed about 6 weeks ago, done 200/300 miles since. Could it be anything to do with fuel injectors, one was changed at that time ?
Sorry, forgot to say it smokes mainly under hard acceleration but doesn't need much to make it do it. My wife drove round a local car park at a fairly steady speed so that I could watch the back.
I have similar issue with a 2003 Vogue. It continually smokes until after about 7 miles of drivinig. No idea what is causing this, but it is highly embarassing and a massive cause for concern, any ideas anybody?