I'm not having a go 250kts but some things will inevitably change. One of the problems Prospect, or any other union in a large organisation will have, is to compromise without capitulating. The nightmare scenario will be agreeing to a pay cut on the premise there will be no job cuts, a year later management say it isn't enough and people have to go. There's an agreement to temporarily shelve NATSAGs, a year later those NATSAGs are no longer affordable to bring back. Etc etc and the rot has set in. Good luck with the suggestion of shafting the pensioners! They've paid into the scheme in good faith and the current pickle is not their making. What I could see happening though is the 9% and 18% contributions being changed. How does 7 and 7 grab you for new starts, maybe even 6 and 6 - sure it won't affect any current employees so why not. A few years later though, the 9 and 18 is no longer affordable so the 7 and 7 is being rolled out across the business. NATS management will be in a position to benchmark themselves against other ANSPs now instead of the other way round. I know what T&Cs some of them have but not all and few even come close to what NATS employees have, particularly pensions.
You only need to look at the reason NATS Solutions came into existence to realise that senior management were only too aware of the unsustainability of bidding with proper NATS T&Cs for new contracts. Don't recall much protest from the proper NATS units that others were being brought into the NATS group under different T&Cs, the same principle will apply now. Rather than bring NATS Solutions up to NATS standards, management will be working out how to reduce NATS to a Solutions model.