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Tracking the coalition's progress
It has been a rocky road for the coalition, with plenty of ups and downs and we have only reached the half way point.
Prime Minister David Cameron and Nick Clegg will renew their vows as they announce the Government's mid-term review of the coalition's achievements.
Here are some highlights - and lowlights - of the last two-and-a-half years.
:: May 12, 2010 - It all started so well. After the General Election failed to give the Tories the overall majority they needed, a deal is announced in Downing Street's Rose Garden. Lib Dems Nick Clegg, David Laws, Danny Alexander, Vince Cable and Chris Huhne all make it in to the first post-war coalition Cabinet.
:: May 29 - The coalition suffers its first major blow as Laws is forced to resign after it emerged he channelled public money to his long-term partner. He is replaced by Danny Alexander. Michael Moore becomes Scottish Secretary.
:: December 9 - Three ministerial aides resign and 21 Lib Dem MPs rebel as the Government suffers a serious House of Commons revolt over tuition fees. Abstentions help slash its majority from 84 to 21.
:: March 12, 2011 - Liberal Democrat activists overwhelmingly pass a conference motion criticising Tory-led NHS reform plans which put GPs in control of commissioning services.
:: May 3 - Coalition tensions over the voting reform referendum boil over when Mr Huhne, then energy secretary, directly confronts the Prime Minister and Chancellor over 'no' campaign tactics across the Cabinet table. Three days later the Lib Dems are humiliated when the Alternative Vote is overwhelmingly rejected in a national referendum.
:: October 14 - The Tories suffer their first ministerial resignation in Government after Liam Fox quits as Defence Secretary after questions were raised about his relationship with his friend and self-styled adviser Adam Werritty.
:: December 11 - Clegg criticises the Prime Minister's decision to veto a European Union treaty. He said the decision was "bad for Britain", claiming it would leave Britain isolated.
:: February 3, 2012 - Mr Huhne quits the Cabinet after it is announced he will face charges for perverting the course of justice, amid claims he asked his estranged wife to take his speeding penalty points.
:: August 3 - In the face of opposition from backbench Tory MPs, the Prime Minister withdraws his support for reform of the House of Lords. In retaliation, Clegg says the Lib Dems will not support the boundary review, which would have seen the number of MPs cut from 650 to 600.
:: November 29 - Clegg and Cameron mark an historic first in the Commons when they give separate statements in response to the inquiry by Lord Justice Leveson into press standards. Clegg said Leveson's proposals for reform could be "proportionate and workable" as the Prime Minister backed away from statutory regulation of the press.
:: December 11 - Tensions emerge between the Lib Dems and Tories over plans to introduce gay marriage. Mr Clegg said he expected his MPs to offer the Government's legislation "thumping vote of support" despite vocal opposition from backbench Conservatives.