Hi Tinstaafl
Agreed, the lookup is very poor.
Bear in mind that there's a list of the codes for all licensed airfields on the 500,000 ICAO chart. It's in brackets after the airfield name in the frequency list. Probably quicker to look up.
For anyone having difficulty with decoding the abbreviations they are listed in GEN2-2 of the UK AIP and can be found at
http://www.ais.org.uk/aes/pubs/aip/pdf/gen/10202.PDF (you'll need Adobe Acrobat Reader)
Mike