Even though employment law is not my field, it is quite plain that what's on the blog (and quoted by Unite) is highly speculative and of very little legal value. If Unite's members are being misled by that into thinking that there is likely to be some legal recourse against BA in the future as a result of the removal of staff travel, then they are clutching at straws, not least because, if there is new EU legislation, it is very unlikely that it will have retrospective effect - so it won't help those strikers who have already lost their staff travel.