'In addition to the concentration of sporting talent and global media, the London Olympics will host the biggest mobilisation of military and security forces seen in the UK since the second world war. More troops – around 13,500 – will be deployed than are currently at war in Afghanistan. The growing security force is being estimated at anything between 24,000 and 49,000 in total. Such is the secrecy that no one seems to know for sure.

During the Games an aircraft carrier will dock on the Thames. Surface-to-air missile systems will scan the skies. Unmanned drones, thankfully without lethal missiles, will loiter above the gleaming stadiums and opening and closing ceremonies. RAF Typhoon Eurofighters will fly from RAF Northolt. A thousand armed US diplomatic and FBI agents and 55 dog teams will patrol an Olympic zone partitioned off from the wider city by an 11-mile, £80m, 5,000-volt electric fence.'

Read more: Olympics 2012 Security: Welcome to Lockdown London