As defined in the Air Navigation Order
'Aerodrome':
(a) means any area of land or water designed, equipped, set apart or commonly
used for affording facilities for the landing and departure of aircraft; and
(b) includes any area or space, whether on the ground, on the roof of a building or
elsewhere, which is designed, equipped or set apart for affording facilities for
the landing and departure of aircraft capable of descending or climbing
vertically; but
(c) does not include any area the use of which for affording facilities for the landing
and departure of aircraft has been abandoned and has not been resumed;
And the CAA still has an Aerodrome Standards Dept and licences aerodromes!