| If the rate from Bennetts is with Groupama Insurance as they usually are with the 748's, then you should check that the insurance is valid as they do not usually cover non BSI exhausts.
Sorry we made a mistake with the underwriter with whom we placed you. We try and provide a first class service and in this instance we didn't and we hold up our hands.
We do have many underwriters who will cover non standard exhausts and a few who will do the non BSI exhausts. | 
Threaded Mode