There is no 'legally correct' way to integrate the two working bodies. There are ways that comply with TUPE and ways that don't. So long as any one of the multitude of TUPE-compliant methods is chosen BA will win any challenge, or the challengers will run out of money. 101917 is simply speculating like everyone else. BA employ expensive lawyers and aren't about to waste that money implementing a windfall solution that ratchets up the costs of Bmi. Those who doubt this should consider this afternoons announcement of 500+ redundancies at LGW.