The car "in bits" is my #4 car, #1484 currently in the process of a massive project, and they were very insistent that we NOT clean it. They wanted one that represented what they're like after nearly 30 years.
They had Neil's spotless and painted engine to film but declined.
The other two cars used for cutaway shots were Rob Williams' and Neil Harkett's #4426 (my old #2 car).
By coincidence, this program featured all 4 of my former cars.
I closed the door for the director who did the filming in Jay's - he must have re-opened it and closed it again after then! The car wasn't dirty - Jay keeps it spotless, but #1458 always looks more grey than other later cars.
What also didn't make the cut was a whole section on how the car's constructed and how the doors work. That in itself is annoying given all the flannel stills with muzak, and even one or two shots used twice
Still, it was a pretty good review from a genuine petrolhead.
Any americans seeing it might wonder who Chris Barrie is - check out either of the Tomb Raider films, or the TV show Red Dwarf.