The question no one dares ask: what if Britain has to defend itself from the US?
(www.theguardian.com)
I'm sure we'd write a strongly worded letter demanding politely asking the US to withdraw immediately if they wouldn't mind us sending some monitors to check on the conditions in the concentration camps.
But seriously, what could the UK do? Send a few of our rinky dink frigates over the Atlantic? They'd be sunk before they'd left the Irish Sea.