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.
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Dressed in a hat and dark glasses, the singer and former X Factor judge seemed to travel around the Tube network completely unnoticed.
Ambulance chiefs said anyone with a long-term or chronic illness who feels unwell on Thursday should try to ensure they are not alone.
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