That’s all about Dan Ashworth who was joining another club. That’s the standard gardening leave. RVN isn’t joining a competitor.
I think from my very limited knowledge there’s something about ‘right to work’ so if the employee is placed on gardening leave, they could take it to court and say they wanted to work. The employer would then have to prove they had a legal reason to place them on gardening leave. In Ashworth’s case, organising the transfers of staff for a rival club would be a legitimate (and fairly standard) reason. I’m guessing ‘to not pay him off until July because we don’t want to’ would not be looked on favourably by a court as a legitimate reason.