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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The lifeboat crew carried the pair into their boat and dropped them off back at Tower Bridge as people watched from the riverside.
The huge painting took two graffiti artists thousands of hours to complete in east London.
Religious leaders have provoked fury after suggesting pupils should be banned from lessons if their mothers drive them to school.