To cut a (very)long story short;
finally, the Tribunal chairman lost patience with the DTI for continuing to fail to produce any coherent evidence that they were correct in their decision. The Tribunal found that "....the Secretary of State [DTI] has behaved vexatiously and unreasonably...."
Thanks largely to the efforts of BALPA's legal people the DTI were "struck out". Legal costs were awarded to BALPA and Flightline together with an order to make good the outstanding redundancy payment claims.
Happy Xmas.