Well with its Pensions Sub-Committees and people studying Pensions in BALPA and BFS, what exactly do you expect BALPA can possibly do that it is not already doing? It is not BALPA that made the rules, and BALPA is one tiny niche outside the whole of UK Industrial Law. Pension Regulations are really the law of the land within Inland Revenue Laws and Finance Acts. BALPA is one little voice on the outside. May not be loud, but it's the only voice I've got!
You should be writing to Blair & Brown (and see where that gets you). That's the law- tough isn't it? You can't trust anybody these days.