Thanks for your suggestions, she threw out smoke for a good few miles
until she had warmed up a bit then it let up, and shes been less smokey
from cold today. Weve checked the plugs and they are all fine (thank
goodness), apparently it could possibly be the cat which isnt too bad as
we wanted to de-cat anyway in the fullness of time, we will keep an eye on
it and ill let you know of any developments...