Supermarket supply chains are responsible for much of the "global scandal" of food waste, campaigners have warned.
Campaign group Feeding the 5000's founder Tristram Stuart said blaming consumers was "a distortion of the facts" and that most official statistics leave out waste that is hidden from the public eye across the food supply chain.
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The man, in his thirties, was found with stab injuries on the upper deck of a bus in Handsworth, Birmingham, on Monday night.
Thousands of passengers now face delays, with Southeastern trains warning "all services" would be affected.
Paramedics attended a scene in Willesden, north-west London, on Monday afternoon where they found the teenager with stab wounds.