The only member of the household on Downing Street to be spared the indignity of one of the fastest political transitions in recent memory will be Larry the Cat, a tabby who holds the title of chief mouser to the cabinet office.
The sudden victory of Theresa May, Britain’s home secretary, in the Conservative Party’s leadership contest on Monday put Prime MinisterDavid Cameron in the unenviable position of having to vacate his residence in about 48 hours. A large blue moving van pulled up on Downing Street on Tuesday to retrieve the Cameron family’s belongings.
It is a rite of passage Britain has experienced many times, but one that is unfamiliar for most Americans. In the United States, a newly elected president has more than two months — between Election Day in early November and Inauguration Day, Jan. 20 — to set up a new administration.
Transitions in Britain are far swifter. A prime minister typically takes up official residence at 10 Downing Street upon getting the job, as Mr. Cameron did in 2010, when his Conservative Party took power after 13 years of Labour Party government.
But the transition can seem even more jarring when a prime minister takes office without a general election. This occurred most recently in 2007, when Gordon Brown succeeded Tony Blair, and before that in 1990, when John Major took over from Margaret Thatcher.
“The prime minister has said he is glad there will not be an elongated leadership process,” a spokesman for Mr. Cameron’s office said in a phone interview on Tuesday, speaking on condition of anonymity because of government protocol. He noted that the need for stability engendered by Britain’s vote to leave the European Union had created a sense of urgency. “This is how British democracy works. When the leader changes, the prime minister changes, and the evacuation of the premises soon follows. It’s a quick departure, but it is what it is.”
Mr. Cameron led his final cabinet meeting on Tuesday. On Wednesday, after his final prime minister’s questions in Parliament, he will visit Queen Elizabeth II at Buckingham Palace to tender his resignation. Shortly after, Ms. May will be granted an audience with the queen and invited to form a government. She and her husband, Philip, will most likely pose for a photo in front of 10 Downing Street with Mr. Cameron and his family, as their predecessors have done.
Larry the Cat will be staying, the government spokesman said wryly, adding that Ms. May would inherit the tabby, adopted from an animal shelter in 2011 to help address a rat problem.