I've mentioned this before but...
I was flying regularly after September 11, short & long haul from LHR, LGW, MAN and BHX.
Most times I wore my hair up. The beak hair clip I used was 5-6 inches long, solid metal, pointed, and serrated. Similar to this, but plain and the 'blades' were serrated.
http://i01.i.aliimg.com/img/pb/726/0...010726_402.jpg
In summary, what equates to two knives, hinged together.
Not once was it spotted or queried. Not. Once.
It didn't even set the metal detectors off. How?
I saw other women wearing similar clips, and I think I recall seeing them for sale airside too. It made a mockery of all the 'security precautions' that you could waltz through with something like that.