David Cameron insisted aid spending made him "proud to be British" today as he urged more investment to tackle global hunger.
Hosting a conference intended to drum up money for the developing world, the Prime Minister backed a target of saving 20 million children from chronic malnutrition by 2020.
Bill Gates and Danny Boyle are set to address the protest rally to coincide with the London meeting, which preceeds the G8 summit in Northern Ireland.
The demonstration, hosted by lobby group Enough Food For Everyone If, is expected to attract thousands to Hyde Park.
More top news
Official figures show speed cameras are targeting thousands of drivers in London as they drive to work in the early morning.
There will be a 'zero-tolerance' approach to hate crime the London mayor and Met police chief say.
Detectives have released CCTV footage over teenage boys robbing a newsagents by threatening the shop keeper with a broom.