For every public airport offering commercial air transport containing an IATA code in the United Kingdom (England, Northern Ireland, Scotland, Wales), name the 3-letter IATA code.
Airport: Aerodrome with extended facilities, often (and in this quiz exclusively) for commercial air transport (see sources in description)
codes not on the official IATA website are excluded, even if they may still be on Wikipedia or FlightRadar24.
Information according to Wikipedia, FlightRadar24 and IATA.