I have the impression that BALPA at the national level do not want to get involved in anything too "taxing".
They certainly scuppered any chance of union recognition at Ryanair about 3 years ago, when IALPA were baying for blood, and now it seems this is all too "grubby" for them to have a go at.
With no disrespect to the hard working CC members in certain companies, BALPA at national level is a bit of a damp squib.