Details of ABN/IBN for individual civil airfields are in Section AD 2.15 of each airfields AIP entry.
When Niknak mentions '3 letter ICAO codes' I believe he's getting confused between ICAO and IATA; IATA codes have 3 letters, ICAO codes have 4. He mentions 'HUY' which I believe (don't know much about IATA codes) is the IATA code for Humberside. Humberside is not listed as having either type of beacon.