It's hard to find someone to blame when a close knit team such as yourself suffers at the hand of the 'Looks good on paper' project managers in Waterside.
They are paid to be impersonal and ruthless, by way of Performance Related Pay. BA is beset with Conflicting Short Term Business Plans that rarely recognise the intangible asset that is employee loyalty. Your success and productivity as an engineering base is paradoxical; If your team had a poor punctuality record or an above average incident tally due to technical reasons, I'm sure a posse of LHR Engineering Auditors would have winged their way up on the next shuttle and found ways of ensuring that their positions were 'justified' for the next couple of years, so they could turn the 'problem round'. Instead, the whiff of short termism has permeated the nostrils of BACE senior managers to your detriment.
Good Luck in your new career elsewhere.