"If they change the roster to 5/3 then that demands an entire renegotiation of the base Agreement."
Not for Brookfield contract !!! The 5/4 is a guideline in an annex of the contract !
And I do not know any Brookfield guy in my base who has already been allocated the 10 days A/L while the Ryanair guys do have their dates.
Hence my worries about what is about to come soon for Broofield contractors...