Airfix did a 1/32 Austin Healey Sprite, which is now OOP, but looks to be available on Ebay.
Regards the colour - to my knowledge British Racing Green is used to describe many similar dark greens, the specific colour you will be looking for will be Austin B.R.G. which I doubt will be available. Countless manufacturers have used the name B.R.G. but it is not a specific / exact colour name, much in the same way that Audi white will be different to Ford white.... so on & so forth.
I would say Brunswick Green is you best bet as it is readily available.