Mmm. I think there may be some double standards at play here by Lord March & Co as regards "replicas". Unless I'm mistaken I seem to recall that the Lancia D50 F1 car (which is a replica) has appeared at Goodwood. I bet if one of his Goodwood regulars such as Nick Mason or Mr Bamford bought one and wanted to run it that he's soon change his tune.
As with the Aston Martin DB4GT Zagato sanction 2 models, I don't see that there's too much of an issue so long as the cars aren't passed off as something they're not. From a spectator's point of view, if the original ones have now reached such stupidly high prices that hardly any of their owners dare take them out on the track, we may be more likely to see these recreations being given a proper thrashing if they are allowed to participate.
As to the TV show, I sort of enjoyed it. Good to see that those sort of skills still exist at Jaguar, and that the company does value it's heritage.