NE Dude,
First aspect is the staff travel system where you are expected to buy a staff travel rate ticket if there is space on the flight. These are cheap and firm, but only come up if the computer thinks the public won't buy them. In addition there is a facility to use commuter travel if you have evidence of having a house, family, bills elsewhere. This applies when there are no staff travel seats available to buy. You can get a commuter letter issued to allow you to travel on a specific route to get home/back to base before and after work blocks. You need to travel in uniform and turn up at the gate with your letter and jump seat or if any no shows, have a seat in the cabin. There is currently no charge for this!
As far as the contract is concerned, I have no idea about that and suggest you contact the company!
All the best.