Hi Guys - thanks for all the response - just got back to the forum after being away for a couple of days

I will take a pic of the wheels and yes I understand that the overall Wheel Diameter may be the same

(its night time here in Scotland just now) I'll post a pic of the 22" wheels with the lower profile tyres tomorrow ie reduced side-wall to the BMW standard therefore the overall circumference may well be the same - which , as someone has pointed out to me may mean the Trip computer will not need to be adjusted......

Can someone tell me what the standard delivery wheel size and tyre sizes are??? ---Thanks Robt