Argentina's foreign minister Hector Timerman said he was sorry that William Hague "can't meet without the supervision of the colonists from the Malvinas".
Mr Timerman invited Mr Hague to meet with him in Buenos Aires, where he said "my fellow foreign ministers can freely meet with whomever they wish without being pressured or having their presence conditioned on meetings that they haven't asked for and don't interest them".
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Following criticism from MPs and campaigners, the work and pensions secretary said the helpline would be free by the end of the year.