According to Wikipedia BASSA were part of The Transport and General Workers' Union which in 2007 merged with Amicus to form Unite.
____link1
It a constant cause of confusion in my mind that the other aircrew branch of Unite - cc89 uses the name Amicus (instead of cc89) - and even the Courts refer to the two branches as BASSA & Amicus.
Wikipedia lists the dates and names of Unions that merged into The Transport and General Workers' Union during the years 1922 to 2006.
_ However BASSA is not on this list.
____link2
Correct me if I am wrong but I believe that BALPA is an independent Trade Union (i.e. not a branch) and therefore has more rights and more legal obligations than BASSA or cc89.
My question is - when did BASSA cease to be an independent Trade Union and become instead a branch of T&GWU?