I have organised my own Legal Protection over the last 15 years. It costs me about £125 per annum for £250,000 of lawyer. The advantage (apart from cost) over BALPA is that I am guaranteed to get help as opposed to whether or not BALPA thinks that I might have a case.
I used to be a BALPA member but on the two occasions that I actually asked for help they were as much use as tits on a bull.