Obama London visit prompts drone no-fly zone

Aircraft grounded as Prez meets Queen

The Secretary of State for Transport has imposed flight restrictions over London for US president Barack Obama's forthcoming visit to the capital, meaning aircraft including "any small balloon, any kite weighing not more than two kilograms, any small unmanned aircraft and any parachute including a parascending parachute" are banned from large swathes of airspace below 2,500ft."