I have a colleague (and good friend) who has done nearly 30 years with our large company.
He hates the job and has done for several years, but has stayed hoping for a good redundancy package (which do come up every so often)
He has recently been suffering with high blood pressure and has managed to persuade his doctor to sign him off for 3 weeks. He's hoping that the doctor will give him more time after this. Stress of the job may be contributing, but IMO his lifestyle/diet etc are likely to be just as much at fault.
Anyway, he thinks that if he can get enough sick-leave, the company will give him a package to leave. This has happened for some of our colleagues in the past (more than 10 years ago) but I think that actually, if the company can show he's not fit to work, they can get rid of him without a pay-off and he's playing a dangerous game.
In the past under-performers have also been given packages to leave, but the company has recently been taking a much harder line and using disciplinary proceedures to get rid of these people.
He's very good at the job and no-one would want to lose him. For his own sake, he should hae left ages ago, but is nervous of change/lacks confidence.
Does anyone know what the true position is with long-term sickness?