2N.I.Any prohibition of or restriction on the user or mode of user of land imposed on or after the 2nd April 1951 by a local authority by order, instrument or resolution or enforceable by virtue of any conditions attached to any consent, approval or licence granted by a local authority on or after that date, pursuant to any statutory provision, being a prohibition or restriction binding on successive owners of land and not being a prohibition or restriction operating over the whole of the district of the authority or over the whole of any contributory place thereof.