Originally Posted by Backpacker
(*) Assuming a standard 3 degree ILS and a 3-nm, 1500' ATZ.
UK ATZ's are 2000ft and either 2 or 2.5nm radius dependent on runway length (1850 metres being the deciding figure).
Also - you can't be cleared for the ILS if the aerodrome is closed, which is where the thread is at the moment.