British Isles – A Natural History is an eight-part documentary series produced by the BBC Natural History Unit and presented by Alan Titchmarsh. Originally broadcast in the UK on BBC1 from September to November 2004, it took viewers on a journey from the formation of what is now the British Isles some 3 billion years ago to the present day, revealing how natural and human forces have shaped the landscape. Each of the 50-minute episodes was followed by a 10-minute short specific to each region of the British Isles. In 2007, the BBC made a companion series about British wildlife called The Nature of Britain, also presented by Titchmarsh.