Def think 40 is a little pessimistic. How many left lists 94 cars either taxed or SORN under the various model designations, so they differentiate between a Ztt SE V8 260 and a SE 260 V8, as according to the site thats they the way they were registered at the time.
MG Rover info's build data shows 151 Ztt V8 builds so roughly 30% have gone if we assume any survivors are either taxed or SORN as the regs now demand.
What fun i have ahead.
Cheers
Keith