Hey Voxie
I think you have got your facts wrong. GATCSA is the professional body, involved in professional issues (target rate of pay, duty hours) Solidarity is the UNION with their own (elected) shop stewards (did you vote). The UNION gets its mandate from the members (If you work for ATNS - which I doubt - thats you)
The UNION negotiates salaries (GATCSA not even invited to these), fight legal battles (labour related issues - fighting, incidents, absenteeism etc).
Never heard of Flip Buys but if he/you have ideas don't keep them to yourselves!
Cheers