Their relations remain warm just as those between their leaders seems decidedly chilly, Chris Mason writes.
Addressing press in the Oval office earlier today, President Trump criticised Sir Keir Starmer and the UK's initial response to US-Israeli strikes on Iran.
The UK was not involved in, nor has it endorsed, the strikes on Iran by Israel and the US.
The deputy PM says the US President rowed back on threats after UK stood up for Denmark's sovereignty.
Turner has spent a nearly 30-year career working across Whitehall and the Foreign Office.
Peter Mandelson was sacked in September due to his links with Jeffrey Epstein being exposed.
The mayor of London did not seek or expect an invite to the state banquet, the BBC understands.
The good-natured state visit demonstrated strong relations, but no ally is likely to change the US president's mind.
BBC North America correspondent Nomia Iqbal shares her experience of flying on the US president's plane as part of the travelling press.
