Paragraph A.1 Development not permitted
Development is not permitted by Class A if—
in the case of any plant or machinery installed, extended, altered or replaced pursuant to this permission, that plant or machinery—
would, if the land or pier is within 3 kilometres of the perimeter of an aerodrome, exceed a height of 25 metres or the height of the highest existing structure (whichever is the lesser), or
would in any other case exceed a height of 25 metres;
in the case of an extension to an existing building or structure, that building or structure would as a result exceed 5 metres above ground level or the height of the roof of the existing building or structure, whichever is the greater; or
in any other case, the height of the building or structure erected, extended, altered or replaced would exceed 5 metres above ground level.