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.
Thousands of people are expected to arrive at London's Hyde Park today, at an event aimed at tackling global hunger. Bill Gates and Danny Boyle will address the protest rally which coincides with a meeting hosted by David Cameron and intending to drum up billions of pounds for the cause.
The lobby group "Enough Food For Everyone If" pledged to involve the public in a 'visual petition' of 250,000 spinning flowers, featuring two million petals to represent the two million children who die because of malnutrition each year.