The situation in GSS is well documented and it might be worthwhile to do a search to get full background information. But to answer your questions,
1 Out of a total of approx 105 pilots at present there are about 60 - 70 First Officers. Most of the Captains are under 55 so there will not be many retirements due to age for at least the next 5 - 8 years. At present the secondee "agreement" with BA is such that 2/3rds of all new commands will go to BA f/o's that wish to bid across. My guess at time to command for a new joiner at GSS would be 10 to 12 years.
2 Many of the pilots do commute and most seem to find it possible. There is no bidding system but you can request specific days off which seem to work for most people.
3 Despite what the website says, GSS are not an expanding airline. The third aircraft arrived in about June 2003. Since then we are regularly told that a fourth aircraft will be arriving soon but we are still waiting.
In the last six months approx 25 have left, with many going to Oasis, with the rumour of another operator starting up in Europe in September looking for type rated people it will be interesting to see how many more decide to leave.
Training is now provided by Lufthansa in Frankfurt, I believe that because so many people have left without paying back the bond (£25,000 over 5 years) the company is now insisting on a bank loan in the applicants name.
Hope this helps
W A B