Re: Not Blackmail?
More common than you might think with "problem" employees.
Managing them out through the correct HR process might take 6-12 months. You still have to pay them, manage them carefully and have them around causing headaches where ultimately you will succeed in the employee leaving with no case for tribunal.
Or you can offer them money to just go now, as they know they will be managed out. Saves the employer money and time in the long run.
Last time I saw it was a senior manager who's departure was communicated by the IT Director as "we had a meeting and he agreed his career aspirations lay elsewhere"