TSSA Union:
http://www.tssa.org.uk/article-1.php3?id_artic le=2282
I have had quite a bit of sickness this year, and the company is talking about sacking me for it. I have had a doctor�s note every time so it was all genuine. Can they still sack me?
Provided the company can show it has acted �reasonably�, by, for example, taking steps to investigate the nature of the sickness and absence, issuing warnings regarding future sickness and consulting a doctor about the nature of your illness, then yes, they do have the right to terminate your contract.
Dismissal on the grounds of capability is regarded as a fair reason.