British Prime Minister Gordon Brown has told MPs he will work 'tirelessly' for a global agreement to tackle climate change when he joins the Copenhagen negotiations on Tuesday 15 December.

He urged developed and developing nations Monday 'not to divide' during the discussions being held in the Danish capital, which saw talks restart yesterday after some African countries walked out of the official negotiations, complaining that rich countries are trying to kill off the Kyoto Protocol.

Speaking in the House of Commons in London, Mr Brown said he would work 'tirelessly' with other partners for a lasting global agreement. 'Today we send a message to all over Europe and the world - there is work to do. We are only half way there to an agreement.'

'Now is the time for developed and developing countries not to divide among each other, but to do what no conference of 192 countries has ever achieved before, that is to come together with a forward looking programme to advance our shared goals.'

Brown was among the first world leaders to announce he would go in person to Copenhagen and will be the first major Western leader to arrive at the conference centre.

Around 110 world leaders – including US President Barack Obama and Indian Prime Minister Manmohan Singh - have committed to go to Copenhagen is an important signal of political will and will give a huge impetus to the negotiations.

The Prime Minister told MPs he would have meetings in Copenhagen with leaders from the African Union, the European Union and representatives from small island states.

'The agreement must be ambitious, global, legally binding within months, be consistent with maximum global warming of two degrees and ensure the fairest financial settlement for the poorest countries,' he told Parliament.