Thanks for the swift response Paul.
I thought that was the case. Headley were cheaper than G & W but after seeing an earlier post regarding UK insurers I rang A Plan (Cherished Vehicle Insurance) and they beat both quotes with seemingly better cover and no milage restrictions.
Interesting...as Cherished have just been given a very good review by a classic Mini owner who was injured abroad, his car had to be repatriated all the way from the Alps and he said the service from Cherished was exemplary