I had a TRG TR4A too, I think it is a fantastic color, favorite of mine of the various BMC/BL BRGs. MG made one that was lighter than the TRG color, the Jaguar color is very dark green. I have a funny story about that color, painted my first car with the Jaguar green (only BRG code my local supplier had even 25 years ago.
My brother was helping, neither of us had painted a car before. We were using old fashioned lacquer, the lacquer thinner we used was the cheap kind used for cleaning brushes and guns and such. Despite our best efforts the car ended up looking like it was covered in dry alligator skin, it was that rough. After much polish it eventually got smoother, but never much of a shine. Re-painted it the next year, it was all temporary work anyway, as it was an MGB with very terminal rust problems.