Martin Evans and Hannah Furness
London Telegraph 
May 1, 2012
Six sites, including two residential complexes, are being tested as launch pads for missile systems capable of thwarting any airborne terror attack.
Starstreak and Rapier missile systems – which have a range of around 4 miles – would be deployed as a “last resort” to shoot down any low flying aircraft intending a 9/11 style suicide mission at one of the Olympic venues.
Defence sources claim radar would identify rogue aircraft and the missiles would be deployed long before they reached built up areas.
But experts have claimed that the systems are useless in poor weather as they rely on the operator being able to see the target.