[Conker]

Arggg certainly not scouthedoggie, that's skirmish in its pure form... Well, some do like it, but I'm not sure that's what would be the best here.

If they might be more interested in milsim, check Stirling Airsoft

There's also games at the UK Armed Forces base of Catterick or, for nice CQB, "The Mall".

Operation Irene might be a good shot?

For Canadian games, the Rawdon games (Quickpass I, II, III) are pretty nice too and available on YouTube.