Paul Rice - I think you should consider what unions are about. In certain cases it may be to 'achieve' something such as equality of pay and conditions, protection from over exploitation etc but mainly they exist to prevent erosion of T&Cs for existing members within the legal framework. Achievements are the domain of politicians. As BALPA is not affiliated to any party you cannot criticise.
I very much doubt if anyone on this forum can have knowledge of successful actions they have fought without a breach of confidence having taken place so your argument is null and void.
Sorry to burst your bubble.