The Ministry of Defense wants to put surface to air missiles in residential areas as part of security measures for the Olympics. This is highly irregular. They are to be used against…
…all manner of airborne attacks from the 9/11 style assault to a smaller “low and slow” attack from a single light aircraft.
I would be surprised to see hijacked airliners ever again. A light aircraft attack sounds plausible, but shot down aircraft wreckage landing on London might still be considered a win for the terrorist.
There are also to be army troops, fighter jets and naval ships at the ready. The MOD are certainly preparing for more than a kid with a bomb strapped to his chest.