Threat to existing pension rights
Not content with messing with the pensions of future employees, NATS are attempting (unilaterally) to use age discrimination legislation as an excuse to worsen terms and conditions for existing pension scheme members - see recent mail for Prospect and PCS members.
Could this be management testing the resolve of the unions? After all, if we won't stand up for our own terms and conditions we're hardly going to fight for the pension rights of future employees.