Timeline: Coalition tensions since May 2010

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 today.

But the the last two-and-a-half years have seen plenty of tests for the first post-war coalition Cabinet:

• May 2010: Coalition deal announced. By the end of the month, David Laws is forced to resign;
• December 2010: Government suffers Commons revolt over tuition fees;
• March 2011: Lib Dem activists pass motion criticising Tory-led NHS reform plans;
• May 2011: Lib Dems lose AV electoral reform referendum;

• October 2011: Defence Secretary Liam Fox resigns;
• December 2011: Clegg criticises Cameron's EU treaty veto;
• February 2012: PM withdraws support for Lib Dem-led Lords reform, Clegg fails to back Tory boundary review plans;

• November 2012: Clegg and Cameron give separate statements in response to Leveson report;
• December 2012: Tensions between anti-gay marriage Tory backbenchers and Lib Dem MPs expected to give a "thumping vote of support".