It was quite interesting, obviously most of it was official secrets act, and when your customer is the Sultan of Brunei you take it pretty seriously, but I got to see a lot of the concept renderings mostly because at that stage I was hoping to one day become a render artist
Most of the cars have since been exposed anyway, this site (not English) covers quite a few
http://svammelsurium.blogg.se/2009/may/bentleys-som-man-inte-trodde-fanns.html
Dad had a number of roles before and after the RR & BMC split, and during his career also worked for British Leyland, Lada cars, the Rover Group, Daewoo, Toyota and a top notch coach builder. He has some interesting stories about most, especially Lada. The downside was most of the company cars were crap!
Edit:
@Nessy it's oddly satisfying making stuff like that isn't it. Probably the closest I got was hand making some bits for the McMerc SLR 722, and for an un-named MSO project.