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Syrian opposition leaders are due in London for talks later with the UK's Foreign Secretary William Hague, BBC reported.

Britain will urge the newly formed coalition to put forward a clear plan for political transition in Syria.

In return, the UK government is considering official recognition of the group as the legitimate opposition to President Bashar al-Assad's rule.

The UK could also push for the lifting of an EU arms embargo to allow the supply of weapons to rebel forces.

Those trying to bring down President Assad's regime moved closer to a united front when the rival leaders of Syria's rebels formed an opposition coalition after months of bitter division.

Three of its leaders, headed by Ahmed Moaz al-Khatib, will be greeted by Foreign Secretary William Hague at the Foreign Office in London on Friday morning.

BBC diplomatic correspondent James Robbins says the UK wants to size them up and test their commitment to human rights and an inclusive government - in the event that they topple President Assad.

Mr Hague said: "I will be meeting some of the figures, some of the leaders of the new opposition coalition, and we will want to discuss with them their way forward, the need for them of course to win over the middle ground of opinion in Syria, to work effectively together, to be inclusive, to respect human rights and to have a clear plan for political transition in Syria.

"Our work with the opposition is a high priority."

The UK is hinting at greater practical and political support for the Syrian opposition, possibly matching France by officially recognising the new coalition as in effect Syria's government-in-waiting.

The British strategy in regard to Syria is likely to be announced early next week.