Morning Bigdavy,
Apologise for the slow response; the interior was original. Note that the colour chart above is for the 420G not the Mk10
I noticed the 420G dash that Carnut posted from the web and you can see that the crashpads are light grey - these have definately been recoloured
Many manufacture's will have special colour paint/trim combinations it's just that the majority of cars roll of the production line in batches.
Our's was black so I guess was special order but frankly it wasn't "special" in the sense that we look at it now. The car was ordered and delivered by Ritchies Glasgow (your neck of the woods?) for Smith & Nephew Pharmaceutical.
Anecdotally I was told that the police in Edinburgh had black jags and as dad had a car phone fitted (1969!!! )with the attendant small aerial we used to get "respect" as the baseball cap fraternity would say, every time we were north of the border.
Nice to see your's on line, I saw if for sale on line originally.Good to see its gone to a good home.