Ok, so having a bit of a clear out today. In the garage, amongst loads of V6 odds and sods, I've found 2 airbags (MK3 Astra/Cav era).
Now, they are as good as worthless and as irresponsible as this sounds, it means I can just bin them (when blown up) without worry that they'll cause anyone any harm.
I have quite a bit of space, so putting them in the middle of somewhere and running two wires to them is no problem.
Anyone know how much power it takes to trigger the small explosive inside one?