Rocket Launchers @ Heathrow

'We were asked to look for people burying things in the ground and shown all the components of this heat-seeking shoulder-launched missile.
'They told us there's no threat whatsoever, but please be on the lookout.

This makes me feel safe.

I can't say the thought of this threat has never crossed my mind before.

Also, 120GBP for a rocket launcher in Afghanistan? Seriously? Is it that easy to get this kind of weaponry?