I’m seeing a lot of international messages getting this wrong, so this is how you refer to the Prime Minister of the UK.
First, we normally refer to the PM just by name, like anyone else. So, “Keir Starmer” or “Mr Starmer”.
“Prime Minister” is not used as a title like “President” is. He’s not “Prime Minister Starmer”. He’s just “the Prime Minister” or “the Prime Minister, Keir Starmer”.
Unusually, this new PM is also a knight. Of course, this has its own rules.
If you want to use this title, it’s not quite as simple as replacing “Mr” with "Sir’. The first name is more important than the surname here. He’s not “Sir Starmer”. He’s “Sir Keir Starmer” or “Sir Keir”.
Hope it helps!
Absolutely - if anything, there’s a reluctance to use formal titles in the UK in general.
I used to teach at university - students and staff alike just use first names when addressing each other. When signing emails, we just use our first name, no letters, job title, anything.
It’s even something specifically touched on in our orientation guide for foreign students.
As for newspapers and Prime Ministers specifically, one of the biggest newspapers, The Guardian, has a cartoonist who has always drawn David Cameron with a condom covering his head. There’s absolutely no deference shown to Prime Ministers here.