The gruesome murder that's remained a mystery for 42 years: Kindhearted bookseller was found bludgeoned to death in his shop in 1982 - and police are still baffled today

Edmund Simpson, from Prestwich, Manchester, was 58 when he was beaten to death with a blunt instrument in Burns' bookshop, which he worked in for 36 years, in broad daylight in 1982.