Barry, regardless of what level of rivet-countery you're hoping to achieve, the best option is to get hold of the book by Mike Starmer covering the theatre and period that you're interested in.
Not only do they include hand-painted colour chips (which may be too small for commercial matching), they include formulas for matching with commonly available modelling paints so that you can paint out a decent area on white card and make sure that you like it.
I only have the NW Europe version so can't help on the various Middle East Colours.
Thanks for the info. I don't consider myself a rivet counter but have a couple of green bikes and fancy a change of colour on this one, I live near Blenheim but have a son in Wellington so I will duck into Union Hardware next time I visit. Cheers
