Those were my last two P6's - Cameron Green ('72 2000TC) and Lunar Grey ('75 3500S).
What a pair!
Forget the Series 1, Jim. S2 better in every respect, although, like XM, hybrids are possible - and often crop up in films.
Cameron Green was a lovely variation on British Racing Green. Funny things, the P6 colours: I learnt from David Bache that Rover did experiment with a lot of body colours for P6, including some very bright ones. They found, with one or two exceptions (eg the sporty Monza Red and Paprika), that these just didn't suit the shape of the car at all, and that mucky and obscure colours were far better, and generally preferred by customers - hence Lunar Grey, Tobacco Leaf, Old English White, Cameron Green, and Almond.
In 1977, when the last of the P6's were painted and assembled on the SD1/Metro lines at Longbridge, they tried some of the SD1 colours - and interiors - on P6, including Avocado green, and Mango cloth. Disaster! and many P6 afficionados steered clear of them by a mile. The problem of these late cars in strange colours surviving was largely avoided by the paint falling off most of them. Some clot rejigged the electrostatic painting at Longbridge, so that the polarity of jig to bodywork was reversed, with the result that gas bubbles became trapped in the paint. Thousands of Mini Metros, SD1's (and a a good few P6's) were repainted under warranty. Bonnets and boots were particularly vulnerable.
In 1977, the last year of P6 manufacture, a limited Collector's edition was offered, in metallic Platinum (a rather pleasant greenish-greyish silver), and with a chocolate or a lighter brown cloth interior. A bit odd. Ironically, the last P6 to be built was a 2200 . . . Not the best, by far.
I always fancied getting my Lunar Grey 3500S resprayed into British Army Green (like the staff cars), but could never afford it. You don't get any muckier than that.