I use my own rule set, which was published a while back in Practical Wargamer, however, it has been improved and speeded up since then. It is suitable for Medieval skirmishes, too. – designer's website
These rules are designed for use with 25mm or 15mm figures - the latter are more in scale, but 25mm look nicer for skirmish games.
Ground scale is 1cm:1 metre (1:100)
Each turn is 2 seconds, but as with most of these games, the time scale is somewhat elastic, and it can be assumed that there is a lot of crouching in the bushes going on.
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