Not langley.
I think previously reps might have been able to get their basic pay when not on BA work. ie attending union meetings that were not to do with BA and now this is not allowed.
I expect that the union pay a daily rate to the reps to compensate them for loss of flying pay. ie. allowances etc. that they would get if they were flying. BA does pay this to trainers and crew working in selection but obviously expect unite to pay this to the reps.
I think you are reading too much into everything.