I'm bored, so i'm feeling controversial....
I believe this car had a Nimbus Grey grille when new
Oh no it didn't
(or at least i don't think it did).
The 1989 Mini Racing/Mini Flame (as opposed to the 1990 Mini Racing Green/Mini Flame Red) seem to have been a bit of a mix & match (from the Latin: Pigus Earus).
They had black door cards/padded dash rails but with grey seat facings & 3 spoke steering wheel!
The exterior handles & wheel arches look black on some cars (but nimbus grey on others) but the grille almost always looks Black.
http://www.austinmin...check mate.html
https://www.sixgear....ml#lg=1&slide=8
https://www.wikiwand...imited_editions
There was a 1989 Mini Racing/Flame, Sky & Rose Register on Facebook, it's no longer run by the originator but you might be able to get a definitive answer from someone on there.
https://www.facebook...kyRoseRegister/