At £42,000.00 PLUS Vat it ain't cheap - in fact for that sort of money you could buy a genuine Historic single seater - so why buy the pretend one!
Having said that, I doubt that you could buy a F5000 or F1 car from the 1960s for that sort of money, so just maybe they will sell. However you would need 15 like minded sould to form a half decent grid!