LOA, after some digging, I owe you a sort of apology, there is a difference between pre and post PPP members. But the confusion comes from the term 'enforced transfer of employment'.
The scheme is protected and all members have that protection, pre or post PPP. There can be no 'decrement' to our pensions and this applies in the eventuality that NATS is sold on, to a new owner or owners. Whilst this happened we would all continue to be employed by NATS.
However, in the event of NATS actually going bankrupt and being placed into administration, which is a much more serious situation, the Trust of a Promise, will only apply to pre PPP members. In that case, post PPP members would have not have the same pension protections described in the Trust of Promise. By being placed into administration we would be subject to an 'enforced transfer of employment', that is to say NATS would no longer exist and we would be working not for NATS, but for 'Network Air' or 'Stagecoach', whoever. And that, I believe,is the difference for members pre and post PPP.
Sorry for the confusion.