Dear Liam,
Slightly off topic but every time I see mention of “line bids” I cringe. If you want a particular day off you have to bid for the line that has that day off and have to accept the remainder of the roster which may be extremely undesirable. They are better than nothing but not as good as a non-seniority based preferential bidding system.
Being non-seniority based means that everyone shares the good rosters and the ****ty ones. Just ask QF pilots about years on reserve.
Many systems out there allow you to plug in preferences such as: late starts, early starts, particular port overnights, night flying only, short layovers, long layovers etc.
Aim high you know management are going to whittle it down.
Now back to the battle.
Cheers