RE: British NBC suit , scent lock ?
When I tried using carbon suits a few years back this was the exact ones I used, and deer came very close without spooking at first. The effect was temporary though, so I gave up using them, they're too much trouble to wash because of the loose carbon in them. Now I just use HS Scent-A-Way green bodywash and a baking soda/peroxide based scent killer spray, and I seem to get about the same results. You can find a recipe for the scent killer in these forums if you do a search, though I'm certain the stores in your country probably carry them. Best of luck.