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There is about 300 different BRGs. BMC/Leyland had about 3 or 4 different ones in Australia. It was just a name to help sell sports cars. There is no official BRG.
Back when international racing was run under national colours a British team could paint their car any colour green that they wanted to.
I concur.
However, I disagree that there was no "official" BRG, in so far as all the pommy car makers, and later others as well, had some sort of "official" BRG in their catalogues. As far as each company was concerned the colour they called BRG was the correct one, but variants in BRG from company to company differed greatly - even within the same group of companies.
For example MG's version is quite light (and the one I prefer) whereas Jaguar's is so dark as t be almost black.
There are only two colours listed as BRG in the BMC colour charts, being BRG and New BRG, and both a very dark. To be honest, I'm not sure which is which and what the exact difference is.
The colour of Mini68's car looks (and colours in photos, especially on a computer are rarely exactly accurate) more like the MG version, and is closer to the BMC colour Brooklands Green - another fave of mine.
Mazda also had a BRG for their MX5/Miata, which was also close to the MG colour, which looked really good with the tan interior.
So, basically, unless you are going for historical accuracy, and just want to paint your car "a nice green" then it is purely subjective, and don't worry about it being called BRG or anything else.
If you want to go for historical accuracy - which in itself is flawed - then a colour match to a part of the car that has not been exposed to much light and has never been repainted is the best option. Next best option is to use the original BMC (usually Dulux) paint code formula.
Cheers,
Watto.
!! 
That's my Missus! 
