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.
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Tencho Hristov ignored warnings and got trapped between barriers at Roydon in Essex.
The 6km bike track will include 130m of the South Circular near Kew Bridge.
The unfortunate officer was taken to a central London hospital for treatment and his condition is not life-threatening.