I think you can, one of my mates also an ex serviceman para.
Well he had a real nasty job, hunting down real dangerous mental patients who had absconded.
These were real nutters who tried to stab him, so he got one of these vests but I cant remember if it was legal or illegal.
Cheers Tony
I hope it was one of the latest high-tech ones. The old ones didn't protect against stabs with a really sharp edged object very well. I recall one case in Wisconsin, I think, where police were demonstrating the then new "bullet proof" vests to a high school class. They didn't shoot each other, but one of the officers in a bit of unrehearsed idiocy, said, "see, they protect against knives, too" pulled a dagger, and stabbed his partner through the vest, chest wall, and heart, killing him.