I suggest you read the above post especially the answer from BA which states:
Quote:
There are no collective agreements that will apply to you under the terms of your contract of employment unless you are, at some future date, told that there is a collective agreement that expressly applies to you.
This does not prevent an employee engaged on a MF contract from being a member of a union nor from being represented through collective bargaining as you suggested, indeed the answer allows for a union that has been recognised to represent MF as a bargaining unit. Reading the rest of the clause 3 answers, they there to make it clear that MF crew are not going to be entitled to the same agreements that are in place for existing crew - not exactly a surprise.