Hertfordshire Police have released the audio of a male 999 caller reporting a bright UFO "coming towards him" in his back garden, only to ring back minutes later to declare that its presence was in fact entirely explainable.The caller told police that he had seen a UFO with "big bright lights" hovering in his back garden. Taking the call seriously the female operator can be heard logging the bizarre information before asking if the UFO was making any "engine noise". The caller replied that it was not, telling her: "I thought it was an aeroplane at first and then its...