Swissdiver: Cathay Pacific offers this Anytime Access to their top tier flyers in their Business Class lounges when not travelling on their flights..
I used this option once or twice a year when I had to fly with another carrier not covered by the CX/Oneworld route map.
Since I am also the top tier flyer with the other Alliances, this perk is not as important to me in most situation.
LGW must be a big issue with BA as VK has rightly pointed out that NO commerical concern can soffer and ubstain this nice perk when there is no actual revenue received from such traffic!!!
I personally would not enjoy entering into a crowded lounge where it is filled with passengers NOT even using that carrier!
This new measure may anger some passengers but a good thing in the long run.