I ordered Monster Island and Escape From MI today. Quite excited.
Imagination positively fizzing, I spent some enjoyable time researching possible accessories for such a game. If anybody's interested here are some ideas: For the hordes of screaming, expendable civilians I'm considering going with N Scale railroad/architectural people - they are about 6mm as best I can tell, come prepainted and are dead cheap; for buildings I might take the easy way out and go with lego-like building bricks, the big sort meant for toddlers - they come in all sorts of day-glo colours (which I actually like), are flexible and nearly indestructible; for the military and police forces I'd likely go with 6mm WWII types, possibly from Irregular; finally, the proper sort of cars and lorries are proving somewhat elusive - modern vehicles would be a snap, but I'm wanting 1930s-1940s models - but e-bay does have several possible offerings at a decent price. Nothing is final here, of course, but it's good fun to dream about.
Rich, I greatly appreciate all the input and pointers you've offered. Thank you!