I fail to see what the "security breach" is?
Why bother to forge a boarding card? Its cheap enough to buy a genuine one! A planned terrorist attack will be funded well enough to buy real tickets...
As far as I can see, all jobsworth before security is doing when he checks your boarding card is ensuring you are entitled to go into the duty free area, and/or preventing unnecessary numbers thronging airside.
The aspect about plastic explosives not showing up on Xrays might be important, but I cannot see why it is tied to this boarding card issue.
Maybe someone can explain here what the "security issue" is? In fact, is the person checking the boarding passes actually "security"?? And it was the Government who did away with passport checks as you leave the UK...
NoD