tongue in cheek, but because the actuaries have stopped taking happy pills (which incidentally allowed NATS to rape the fund) and are now on Prozac - NATS wants to change the scheme.
I can see it now -
Actuaries - "we are pessimists, you need to contribute this amount... oh we were wrong."
NATS - "That's alright, we'll pillage the fund."
7 years later
Actuaries - "now we're optimistic... bugger"
NATS - "That's alright, we'll shaft our employees."
?? years later
Actuaries - "guess what, we were wrong; the fund was manageable after all"
NATS - "never mind, we've gained during good and bad times, and we managed to get rid of the airports... thanks!!"
I'm not buying into that
Fit to Burst
No worries - becomes clear now