Thank you so much for the replies, I was asking as I am about to ring my current insurer to enquire what difference I would pay when the changeover takes place. Currently I pay £245 per year, on a Mark 6 GTI with full no claims discount, legal cover and business insurance included which I thought was really good, and the cheapest I could find (tesco if you were wondering).
My worry was due to the performance ability, that insurers would demand a high premium, but it would appear that is not the case. Once the advice on the plate comes through will call them to arrange cover and see what the damage is.