“The UK Government has indicated that airspace restrictions will be placed around all Games venues. The major restrictions will be centred on London and the Olympic Park and will run from 14 July 2012 to 15 August 2012. A smaller set of airspace restrictions will then be put in place for the London 2012 Paralympic Games from 16 August 2012 to 12 September 2012.”

http://olympics.airspacesafety.com/

There will be a large area of restricted airspace centered on London in which any flying will be strictly controlled and must be pre-authorised. The Typhoons will be acting as QRA aircraft and will not be flying standing patrols. I imagine they’ll return to Northolt to get settled in a week or two before 14/7.