If you want PCCC or any other organisation/Union to represent LGW, LHR or anyone else, the first thing you need is a strong leader or leaders....It would seem that the PCCC have neither. Even if you wished to keep the membership under wraps for the time being, the leaders should be out there and voicing opinion and strategy. Having members join a secret society is ridiculous....I doubt you can keep the membership secret for too long anyway. Without the leaders, at least, being out there and vocal there is no way to determine whether they are company stooges or indeed Professionals with some moral fibre. Joining just because you don't want any truck with BASSA makes no sense.......
I have been in the situation of a mass move from one TU to another for similar reasons. It's not easy, but, it definitely needs leadership.