Presumably Britain Forbade Them From Doing So.

https://www.jpost.com/breaking-news/article-723045

https://twitterwithbraincells.blogspot.com/2022/11/and-hopefully-it-had-no-lasting-impact.html

Not that Britain is exactly the mark of legitimacy. 

They are the poorly darlings who didn't realise they were just casting themselves out into the deep freeze.

While setting themselves even more work to bring themselves back in.