cheers people
ive since picked the car up and it smokes for the first tens mins then clears completely, then if you switch it off and leave it for anything more than 5 mins, when you start it again it smokes for 10 mins as before. A friend reckons it could be valve stem oil seals, the smoking is oil leaked thru burning off? Any comments?

and do you know if they can be done without removing the head?