Bing found the following results
Rishi Sunak appointed prime minister of the United Kingdom
U.K Prime Minister - The New York Times
Rishi Sunak: A quick guide to the UK’s new prime minister - BBC
Live updates: Rishi Sunak becomes UK prime minister - CNN
Rishi Sunak: World leaders welcome next UK prime minister - BBC
Three PMs in two months, is political chaos the UK's new normal?
U.K. Prime Minister - The New York Times
Rishi Sunak set to be UK's next prime minister - CNN
Prime Minister - GOV.UK
What does the prime minister actually do? - BBC News