Amazon came through today with the Force on Force rules, plus two supplements. Total cost - about A$58. Which is very inexpensive. Haven't had much time to have a look, but first impressions are positive. Except all my 15mm Moderns are based on 30mm x 30mm bases suitable for Peter Pig's AK47.
I shall have a look at how the rules will work for multi-figure bases, or maybe I will be forced to look at one of two options - either rebase (yuck) or go to single figure bases, and if I do that, then the Empress Miniatures modern British are very tempting, as are the Eureka moderns. "Resistance is futile.."