Euro zone and Greece

Finance Minister of Greece Venizellos gave a categorical assurance yesterday that the country would not default and would not be leaving the Euro as Ms Mirkle and Sarkozi would not allow this. The news today tells us something else and the BBC reports that Greece may be allowed to default on half its debt, can politicians be trusted when they give us categoric assurances that something is never going to happen? Something like Margaret Thatcher and Nigel Lawson's position being firm a week before she fired him...