What gives you the idea that Redhill is not a controlled aerodrome? Eurocontrol defines a controlled aerodrome as "An aerodrome at which an air traffic control service is provided to aerodrome traffic" and, according to the UK AIP, Redhill provides an ATC service (Redhill Tower) between the hours of 0845 and 0715. Where, pray, is the misuse of aviation language?
Alex just beat me to it.