The legal positions of breaking the veil of a limited company, DB pension schemes and jurisdiction are not questions for these forums, as no one here is privy to the transaction details.
All we know is that a transaction has occurred whereby (in substance) BMI staff will transfer to BA and as a result some will lose their previously agreed pension rights.
In the meantime, we have spent 500+ posts debating seniority lists etc., which are in relative terms a zero sum game/cost for management, whilst the airlines have potentially cost BMI staff £85m!
This situation is fundamentally different to redundancy etc., which can and does unfortunately happen and is in line with an employee’s T&Cs.
We now have a situation, however, whereby through the actions of LH/BA/IAG, employees have lost their previously contracted obligations, and this requires addressing ASAP for the interests of all UK private sector employees in a DB scheme.