Tuition fees toxic subject for Liberal Democrats

The tuition demo with its placards accusing Nick Clegg of betrayal brings into sharp focus the tensions at the heart of the coalition.

Liberal Democrat MPs who promised to oppose any rise in tuition fees are being threatened with an electoral challenge from the National Union of Students.

But Mr Clegg, the Lib Dem leader and Deputy Prime Minister, told MPs that the plans offered a 'fair deal for students'.

Reeta Chakrabarti reports.