Protesters have this morning scaled atop the roof of the Houses of Parliament in protest at the planned expansion of Heathrow Airport.
Just days after a similar protest at the airport itself, the five activists, from airline campaign group Plane Stupid, gained access via a fire escape, having got into the building on visitor passes, and unfurled a series of banners, one of which read "No 3rd runway at Heathrow", another "BAA Headquarters".
For the second time this week, Londonist finds itself questioning the level of security at our key transport and political sites.
One protester, going by the name of Richard George, told the BBC that they intended to stay put until at least Prime Minister's questions at noon. At which, presumably, one of the questions Gordon will ask will be "who the bloody hell is that on the roof of the Commons"?