Head of UK's largest union quizzed

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Dave Prentis is the leader of the UK's largest union, UNISON, which represents local government and health service workers.

He argues that using private finance is costly to the public purse, and undermines the principle of public service.

But on Tuesday Tony Blair will tell the unions that he is determined to use the private sector where necessary to reform schools and hospitals.

Are the unions right to oppose the government on this issue? If they cannot reach agreement, what should they do about it?

Dave Prentis answered your questions in a live forum from the TUC conference.