Found this matchbox helicopter at my local Coles grocery store, for AU$3. It's part of a series of aircraft that look to be about 1:400? I believe it's the Sky Buster's MBX Metal range, but the specific model isn't listed on the Matchbox website.
Here it is with some 15mm figures from Peter Pig and CannonFodder.
Needs a new paint job, but should come up just fine I think.