There is absolutely no doubt that the conference we will have in London in January, with a Yemen element to it, will be an important means by which we will help the Yemeni authorities who are fighting terrorism to develop the means and the will to do this even more. (Andrew Marr Show 3rd January 2009)Yet it turns out that the conference is ‘likely to last up to two hours’ and will only be at foreign minister level –
YemenSir Patrick Cormack: To ask the Secretary of State for Foreign and Commonwealth Affairs what arrangements have been made for the conference on Yemen which he recently announced. 
Mr. Ivan Lewis: The meeting on Yemen which my right hon. Friend the Prime Minister announced will take place on 27 January 2010, and is likely to last for around two hours. It will be principally at Foreign Minister level. We are in the process of discussing participation and the agenda with key international partners.
So it's not a conference. It's a two hour meeting. And it's for Foreign Ministers, not Presidents and Prime Ministers.
A bit of overselling and grandstanding by Gordon Brown, wouldn't you say?