OK, need to set something straight.
Anyone who is in CAAPS now CANNOT be forced out of the scheme. The Trust Deed and Rules gives every member this protection whilst you are an employee of NATS. If you don't believe NATS or NTUS, get in touch with CAAPS and ask for a copy of the Trust Deed and Rules and ask what it means.
The bit about being an employee prior to PPP (July 2001), means that if NATS, or any part of it, is sold, then you retain the right to remain in CAAPS, or a scheme at least as good. This cost has to be paid for by the new employer and the sale cannot be agreed unless the new employer agrees to join CAAPS or provide an equally good scheme. If you joined the company afer that date, you do not have the same protection.
Misunderstandings like this is why it is important to attend the briefings and to ask questions there. If you still vote NO, then at least it will be from an informed position, rather than voting on hearsay, mis-information and rumours.