To set the record straight, The Goose is not an unofficial bar. It is the crew room, or Lounge, of the 1435 Flt Aircrew. It doesn't serve beer.
It does however, have a stock of cans for off duty aircrew to drink. Interesting guests (soz Beagle) are invited to attend on an ad hoc basis and are allowed to be there under some strict rules.
Granted, others have spoilt it for the rest in the past.... hence the strict rules.
p.s. BEagle, why you call the Falkland Islands the Malvinas? Do you still call Iraq Mesopotamia?