Protesters have gathered outside the British Foreign Office, where Western powers are meeting to discuss tightening UN sanctions on Iran. The demonstrators, described as members of the Iranian resistance, are calling for full sanctions in the row over Iran’s nuclear programme.

The five permanent UN Security Council members – the US, France, Russia, China and Britain – plus Germany are meeting. The Iranian president has upped the anti in the controversy by saying his country’s atomic work is “like a train with no brakes and no reverse gear”.

Washington has said that “all options are on the table” after Iran’s refusal to heed a UN deadline to stop enriching uranium. The Islamic Republic maintains it has the right to use nuclear power for civilian purposes, denying there is any plan to make weapons.

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