David Cameron has identified other priorities for this summit - trade, tax and transparency - and will host a pre-meeting focused on world hunger. These are all vital issues, but the Prime Minister also needs to protect what has already been achieved and should encourage the G8 to deliver on past promises.

Thursday is World Malaria Day - a moment to reflect on the enormous global efforts taking place to rid the world of this terrible disease. It's also a poignant reminder of all those who have lost their lives to malaria, including my son Harry who died in 2005.

This year on World TB Day, the news that the Global Fund to Fight AIDS, TB and Malaria no longer has the resources to continue expanding its work is catastrophic for the 3,800 people dying every day from TB and for 33.4 million people living with HIV for whom TB is the leading cause of death.

The Global Fund to Fight Aids, Tuberculosis and Malaria has celebrated its 10 year anniversary. The Fund was set up as an international financing o...