Sir Keir Starmer accidentally called Rishi Sunak "prime minister" while speaking in the House of Commons on Monday, 22 July, weeks after Labour won the general election.
During an exchange about migration, the prime minister's predecessor urged him to keep partnerships with third countries – such as the one he struck up with Rwanda – “on the table”.
"I would urge him in his conversations with other European leaders to keep the option of further third country migration partnerships on the table as other countries have been discussing," Mr Sunak continued.
"Old habits die hard," Sir Keir joked as laughter echoed round the chamber following his mistake.
