Asked about Olympic Games legacy at the London Assembly, Lord Coe said: "We need to create space outside the school timetable for sport."
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Police said a bullet was discovered in the stomach of the teenager after a confrontation at Barking Station in east London.
A large area of high pressure centred over continental Europe is predicted to move across the UK bringing and sunny weather to many.
The rat snake, which is not venomous, is thought to be an escaped pet that got into a property which is being renovated.