I've just had one of my lot chuck in the towel.
Letter states no reason, the verbal response to "Why?" was interesting, he's always been a conspiracy nut.
What became clear, the walk was because he's an anti-vaxxer / mask avoider and if he's going to be working in a shared space very close to other staff* (instead of outside / in a compartment by himself) then we've needed to insist he has to take precautions against transmission of covid. And he won't be forced to do either [he's also worked as a porter in a care home / elderly persons facility]
We do this with all visitors (clients, reps etc)
Note * Everyone else will have had at least one jab by the end of this week.