Just as a quick aside, if NATS offered a 30% rise to cover the next 5 years but only 20% of it were pensionable would you take it or leave it? I know what my answer would be
Good point apart from the fact....
a) In our wildest dreams we'll never see anything like that in the next 5 years
b) they have offered NOTHING to mitigate any hit we will take on our pension.
Therefore, NO.