Ask any Ferrari, Porsche or Ray-Ban salesperson about their average customer and you will very likely hear that he is not, as the adverts would have us believe, a virile young footballer with shiny hair, a rippling six pack and a trouser pouch like a new punch bag. He is, in fact, a middle-aged bloke wearing more chins than he started life with and carrying the clear evidence of forty years of beer and pies slung across his midriff.