Why not in the NATS Forum ?
The topic being discussed is of relevance to many ATC staff, regardless of their employer, since everyone has pension and salary negotiations I expect.
NATS staff are not alone in having to fight their management on these issues, and keeping the topic in the public eye allows others to see what is going on in NATS, compare it with their own situation, and provide independent comment which might be of use to us all in the ATC industry.