Don't rely on BALPA.
I am a training captain with BA Citiexpress. Now my aircraft type has been sold I am to be:
1) Removed to another base and bonded for the removal expenses.
2) Demoted to FO, trained on new jet type and bonded for the type rating.
3) Have a £10k pa pay cut in the first year and at the company's discretion a further £6k pa pay cut after that.
I am a member of BALPA, we have full industrial recognition at BACX and all this is done with the approval of BALPA, with exeption of the pay cut.
Unless you are mainline BA save your money and spend your 1% on loss of licence insurance or legal protection insurance etc.