Will the UK coalition government unravel?

I was watching a BBC interview with Lib Dem MP Simon Hughes yesterday and I was wondering if the UK coalition government will unravel. He made a good job batting away a question about a possible graduate tax but then was asked about the Iraq war.
Perhaps his reply was not helpful to the coalition government but shows up the differences in the administration. Hughes said all Lib Dem MPs thought the war was illegal.

The UK coalition government has to get on with the situation as it is now. The aim must be to extricate our troops from fighting abroad rather than worrying about the illegality of the Iraq war, which is just too late.

It is amazing that the Labour Party is taking so long in selecting a leader, when the coalition government could do with some external rather than internal opposition.
For instance, Andy Burnham should be leading the attack on the government plans for the NHS, which represent quite a gamble.

Lib Dems attack Shadow Chancellor Osborne.

Liberal Democrat Treasury spokesman Lord Oakeshott has attacked the Conservative
Shadow Chancellor George Osborne. Apparently, in the City there is the feeling that Osborne is not interested in financial services and comes to meetings unprepared. Oakeshott was talking at his party's conference in Bournemouth. This is reported in the latest edition of Money Marketing.

Of course, Osborne is seen as a good friend of Tory leader David Cameron, which is probably viewed as something that will be tested in the future.