Well, the UK is a sovereign country so they have the right to tell companies operating in their borders to do what they please.
But sure, countries can sign trade treaties that give each other mutually-beneficial things. Some of those things could be what is and isn't allowed to require companies to do in order to operate within the other country's borders.
But in absence of something like that... that's just life. I guess the US could act like a baby and slap tariffs on goods from the UK, but I'm not sure what the upside would be for the US here.
So this is a charade while status is quo, I guess.