2) Hire four Arabs and tell them they're taking part in an important exercise to help defend London from terrorist attacks. Strap them with rucksacks filled with deadly explosives. Tell the Arabs the rucksacks are dummy explosives and wouldn't harm a fly.
Weren't you the least bit embarrased to reference something this stupid?
5) Before the bombings take place, make sure you warn any of your buddies who are scheduled to be anywhere near where the bombs go off. If this gets leaked to the press, just deny it.
I like these theories. There is also the possibility that London Inerpol investigators were getting several tips that there could be bombings in these locations, so they were playing it safe by having drills in these 'hot spots'.