Apparently BMC used at least three different shades of green on their A series engines. ESM stock one of those shades. There may, therefore, not be one single "correct" colour for A series engines.
*ponders*
Just thought I'd share

wibble xx
that's a bit rubbish isn't it! Hope you had a conversation with the supplier, lesles wrote:I bought two cans of engine green from the company that Wibble used a while back ( I think it was wibble) when the paint arrived I managed to cover the engine (mini) with one tin, apart from one small area which I started the second tin on. The colour was so different that I had to paint the whole thing again! Quality control is just a theory!