268. Orders to prevent obstruction or interference with operation.

Where any land is, or is to be, used by a Secretary of State1 for defence purposes2 as an airfield or for the operation of any electrical apparatus for affording navigational aid to aircraft or for communicating with, guiding or locating aircraft or missiles, and it appears to him that an object3 situated within two miles of the boundary of the airfield or of any part of the apparatus is likely to cause interference