Cap 371 sounds like or similar to what we do.
Fix link means no aircraft change, yes.
Prefferences are as broad or as narrow as you set them to be.
The whole roster is stable. You'll find on the whole you'll do exactly what your have on the page in front of you. Things do go wrong sometimes, but hey that's flying. There are plenty of agreements covering you, rest, days o, etc etc. So as I said you generally do what you see. The only times of uncertainty are standbys. These can be changed in advance or on the day. You won't get rung up to say your not going to Munich any more, your going to Athens.
BA cannot ring you on your days off.
We do opperate max 6 on 2 off. Sometimes it's less. You can allow Carmen to roster you 7 days on, this will then give you 3 off. Again it's just a prefference.
There are so many rules and agreements I can't post them here. Lets just say on the whole we're pretty well looked after and protected compared to other UK opperators. This isn't charter, it isn't low cost. Most who come from either of these backgrounds to BA say they would never go back and we don't know how good we've got it.