I have just put the phone down with Hagerty, who were recommended as a potential insurer by a TVR chum. They beat the other 'usual suspects' on price and lower xs's on an inclusive, 4,000 limited mileage, comprehensive policy on a '94 993.
Hagerty for me was £390, xs £150, windscreen xs £60, 4000 miles limited policy on agreed value but I need to send 2 photos of the car and a piccie of the garage it goes in to qualify for their agreed value policy.