Prime Minister David Cameron has arrived in Mexico for a G20 summit of the world's leading economies which will be dominated by the crisis in the eurozone and the fallout from the Greek elections.

Before leaving London, Mr Cameron held a conference call with the leaders of Germany, France, Italy and Spain as well as the presidents of the European Commission and European Council.

It is understood the leaders were encouraged by the results of the ballot, which saw the centre-right New Democracy party outpoll the far-left Syriza in an outcome which makes a Greek departure from the euro less likely.

But there is now a sense of urgency about New Democracy - which is signed up to the austerity programme demanded in return for Greece's multibillion-euro bailout - forming a coalition government in Athens.