Nick Clegg said he "cannot envisage any circumstances" that would see the coalition collapse before the 2015 general election.
The Deputy Prime Minister added that he "really thought" the Liberal Democrats and Conservatives would continue governing until that time.
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Lord Hain has raised concerns that British financial institutions in South Africa could have been used as conduits for laundered money.
People could suffer vision loss or infection from the lenses, which are often sold illegally online, in shops and on market stalls.