I use Humbrol Grass Green for my figure bases on my classic Napoleonics. Over the years I have noticed that the colour varies tin to tin.
I have been looking for an alternative to use on the mdf bases which matches the Humbrol Green I use on the figures themselves. I gloss varnish figures, including their bases, and leave the mdf bases matt. The Gloss varnish changes the colour as it reflects light making the figure bases lighter than the Matt finish on the mdf bases
I have tried various tester pots of Matt emulsion and think I have well found a good match.
The photo shows a comparison of a Valspar matt emulsion colour called Sea Turtle (R251A - available at B&Q), on the left and Humbrol 80 on the right.
A pretty good match and with bonus that the Matt emulsion is cheaper and easier to use. It also gives me the option of painting my 2ft square mdf boards in the same colour.