I think it’s tvs who might be getting confused. I don’t think Moonstone Grey is an option for the i4.
The only grey which is “free” on the Sport is Skyscraper.
Brooklyn is available on the M Sport, but afaik would cost another £600 ish for Motability customers.
Same as Dravit Grey which is much darker with a bronzey tinge in certain lights.
Beyond that, you’re into BMW individual colours which are silly money, £3k plus.
Happy to be proved wrong though!
2024 - BMW i4 Grand Coupe eDrive 35 Sport
2020 - Volvo XC40 T4 Inscription
2017 - Audi Q3 TFSi Sport S-Tronic