The debate on what is known as “the Humble Address” normally lasts about five days.
At the end of the debate there is a vote. It is normally seen as symbolic, as it is extremely rare for a government to lose it.
The last time this happened was in January 1924, under Conservative Prime Minister Stanley Baldwin.
Mr Baldwin proceeded with a King’s Speech – George V was the monarch at the time – despite having lost his majority in the previous month’s general election.
He was forced to resign, and Labour formed a short-lived government.