Permanent-pensionable status can't be ignored
A permanent and pensionable job is quite the valuable commodity in the modern-day workplace.
Most entrants into the jobs market have to reconcile themselves to the idea that they will have to not merely change jobs, but change entire career paths at some point.
Within the public service, however, there is still a strong level of permanence. A high level of incompetence or indiscipline would, of course, result in dismissal after a drawn-out process. But no redundancies can be undertaken based on economic circumstances.