Well in my case, when I resigned from my previous company, I just handed-in my resignation, agreed to leave in two months instead of the standard three, and that's that.
Of course this was in France, and whilst I qualified as staff with access to sensitive info, I wasn't a manager, and quite removed from CEO, so no strategic info and no gardening leave.
Ashworth isn't even the CEO at Newcastle, just the sporting director.
Will check google about moves or resignations of other sporting directors in a bit...
Edit- found an article reporting Newcastle poaching Ashworth from Brighton, no mention of a "transfer fee", just gardening leave:
https://www.skysports.com/football/...r-newcastle-talks-over-sporting-director-role