An Anglican priest due to appear in court in October for nonviolent civil disobedience, will offer a prayer against drone attacks at Greenbelt on Monday.
Following allegations of GCHQ involvement in the US 'Prism' programme, calls are renewed for the agency to disclose its policy on support for CIA drone strikes.
Six peace activists, representing the group Disarm the Drones, have become the first in Britain to be arrested and charged for anti-drones related offences.
The Peshawar High Court has declared the US guilty of war crimes for its use of drones in North West Pakistan, and ordered the government to stop future strikes.