A police spokesman said Sam Woodhead was a little sunburned when he was found, but was hydrated and otherwise well. His family has been notified.
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The bus reportedly hit a tree near Russell Square.
Low pressure will throw cloud and few showers across the UK today, but it will also draw in very warm air from Europe again.
A stuntman has surfed a set of waves in Tahiti on a customised motorbike fitted with skis and a a special paddle-tyre.