The airline wants to recruit new, non-unionised pilots, whom Balpa believes will be paid less, leading to an eventual deterioration of conditions for mainstream BA pilots. BA argues the subsidiary would not be economic if the new pilots had the same terms and conditions as Balpa's members.
I have yet to see an article which does not talk about OpenLies pilots and similar Ts and Cs to those enjoyed at BA Mainline. It has been repeated at every opportunity by BALPA and BA Mainline pilots that Ts and Cs at OpenLies is NOT the issue.