British Conservative Party MP Patrick Mercer resigns his party whip over allegations he broke the rules on lobbying.
The Liberal Democrats gains the Chesham and Amersham seat in a shock defeat to the ruling Conservative government. The Conservatives suffers a swing of 25.2% away from them in a by-election billed as a sign of further realignment in British politics. This is the first time that a non-Conservative MP represents the constituency.
Three British MPs – Anna Soubry, Sarah Wollaston and Heidi Allen – defect from the Conservative Party to The Independent Group, citing their opposition to Brexit and the party's adoption of UKIP policies. This brings the total number of The Independent Group MPs to eleven following recent defections from Labour.
Home Secretary Theresa May gets 165 votes after the first ballot of Conservative members of parliament to select a new Leader and the next Prime Minister. Her nearest rival, Minister of State for Energy Andrea Leadsom, picked up 66 votes. Secretary of State for Justice Michael Gove won 48 votes, and Secretary of State for Work and Pensions Stephen Crabb got 34 votes. Former Secretary of State for Defence Liam Fox is eliminated from consideration as he received just 16. Later, Crabb pulled out of the race and endorsed front-runner Theresa May. Fox also endorsed May.
Labour deputy leader Tom Watson demands party leader Jeremy Corbyn, who opposes PM David Cameron's (Conservative) proposed air strikes on Syria, to ensure MPs are given a free vote on the proposal this Tuesday.
The Labour Party wins the three by-elections held in the United Kingdom on Thursday. Steve Reed is elected in Croydon North, Andy McDonald in Middlesbrough and Sarah Champion in Rotherham. The UK Independence Party achieve second place in Middlesbrough and Rotherham, beating the Conservatives and Liberal Democrats.
In the United Kingdom, Secretary of State for Energy and Climate Change Chris Huhne of Liberal Democrats threatens legal action over "untruths" told by Conservatives opposed to the Alternative Vote system as the country prepares to vote on the issue.
The Conservative Party's David Cameron kisses the hands of Queen Elizabeth II to become Prime Minister of the United Kingdom after Gordon Brown resigns as Prime Minister and as Leader of the British Labour Party.