For those excellent Co-pilots (to use the BA term) who are based in London, another "Cathay Gotcha" is this. To be promoted to Captain, they have to relocate their entire family to Hong Kong for an unknown period of time until they can get a UK base as a Captain. They could go alone but most don't. In fact, most decide to stay on their UK base as a Co-pilot. I can't think of any other airline that has this restriction. Another Cathay 'own goal'.