Let me first say it is rare for me to side with a multi-national corporation, but I do in this case.
For everyone on this thread who is saying, “Then can I sue for……”. If you live in the USA, then the answer is: Yes, you can sue for anything here. The question is whether you will win.
If this case was here in the States, I doubt it would go anywhere. It is not the government trying to force him to do anything. I think the courts would rule that he would be free to find another job.
Since this case is in the UK, I have no idea what laws would apply. Any in-put from our friends over there?