So what can we expect to happen over the coming days? Here’s a guide to the big political events to look out for.
Friday, December 13: Johnson’s victory speech
Johnson’s first job will be to make a speech outside Downing Street on Friday morning.
These can be big moments for an incoming prime minister. Tony Blair’s comments upon winning a landslide majority in 1997, that “A new dawn is breaking, is it not?” was the sort of defining moment which Johnson will seek to replicate.
Monday, December 16: The Cabinet reshuffle
Johnson’s first big task will be to appoint a new Cabinet. Liberated by a large majority, the prime minister will be free to shape his top team exactly as he pleases without fear of upsetting one faction or another.
A dramatic overhaul isn’t likely immediately, however. His first priority will be to replace Nicky Morgan, the outgoing culture secretary. He will also need to appoint a new environment minister after Zac Goldsmith became one of the few Conservative members of Parliament to lose his seat.
A bigger Cabinet reshuffle will most likely come in January. The Department for Exiting the European Union is reportedly set to be folded into the trade department, while the Department for International Development could be folded into the Foreign Office.
Tuesday, December 17: MPs summoned to Parliament
The House of Commons will officially return on December 17. The first order of business will be swearing in Lindsay Hoyle as speaker; he is taking over the role from John Bercow.
Then, over two days, new MPs from across the House will be sworn in and start moving into their new parliamentary offices.
Friday, December 19: Queen’s Speech
The Queen’s Speech is an elaborate ceremony to mark the beginning of a new session of Parliament. It usually takes place in the House of Lords and is full of the sort of pomp, pageantry, and tradition that draws viewers from around the world.
Downing Street has confirmed that the state opening of Parliament will take place December 19, though it insists it will feature “reduced ceremonial elements.”
That means none of the crowns, robes, or carriages that feature in a typical state opening.
The Queen will still attend the event, however, and read out a speech written for her by ministers.
A Downing Street spokesman said in November: “Should this prime minister return, the State Opening of Parliament and the Queen’s Speech will follow on Thursday, December 19.
“The State Opening of Parliament will take place with reduced ceremonial elements, as was the case following the early general election in 2017.
“This is due both to the early general election and the proximity of the State Opening to Christmas.”
Thursday, December 20: Brexit comes back to Parliament
Johnson has also pledged to reintroduce the Brexit Bill — which would ratify the deal he struck with the EU — as an “early Christmas present.”
The prime minister is also expected to hold the first reading of his Brexit Bill immediately after the Queen’s Speech — possibly as early as Friday.
This would only be the first step, however. Parliament would enter recess for its holidays afterward, and the legislation required to pass Brexit wouldn’t be introduced until next year.