Weren't supposed to wear them in the Chipmunk for fear of upsetting the compass (that's the old P type compass between the knees) ... most did though through a sense of self preservation should it have been necessary to cut the seat straps to get away from a burning aircraft
Also ... very good for laying turf ... so I'm told
Am I correct in assuming that this is the MK1 Aircrew Strap Cutter under consideration ?
If so ... it looks like Elf & Safety don't want aircrew playing with anything too dangerous these days
