The prime minister has arrived in Johannesburg in South Africa for a gathering of world leaders at the annual G20 summit, BBC reported.

The summit brings together the 20 biggest economies, although Donald Trump has decided not to attend over widely discredited claims that white people are being persecuted in the country.

Sir Keir Starmer, whose critics label him "never here Keir" because of the frequency of his international trips, will emphasise the benefits of a prime minister acting as an ambassador for UK businesses abroad, according to BBC.