With that track record, one shouldn't be at all surprised at the outcome of events. Any guesses on what's likely to happen next year?
There must be internal disciplinary procedures that could/should have been triggered last year. Were they acted upon?
If not, it's a situation that's likely...
Without knowing UK employment law intricacies despite having employed many in the UAE, this part is probably the most pressing.
When it comes to employee disciplinary issues including that of sick leave abuse, the first rule is 'document everything'.
Even if the sick record of the individual...