This web site has an interesting feature .
http://www.clubhyper.com/reference/bsc1931wm_1.htm
You can use your favourite paint programe and match the digital RGB values .... it gives an approximation of the colour .
These colours are still bog standard and in use today . My local paint shop ( Wattyl brand ) has them all on a computer . Just ask for the BSC ??? number and they mix it up , and the match is very accurate . I asked for the Land Rover Bronze green - BSC #24 from the 1950's .... easy . Perfect match .
Mike