One other point though...
You get a Seniority Number when you join. As people leave & new pilots are recruited your number will decrease (ie move towards the magic #1 spot).
Senior pilots have lower numbers, but I'm sure you knew that.
The numbers are updated usually every Jan/Feb.
Having 'seniority' within BA is very nearly the be-all-and-end-all.
Good Luck
(Talks adjourned for tonight. Reconvened tomorrow. Standard practice-wear down the reps. Wouldn't be at all surprised to see the talks lasting until the 16/17th)