Woman , named as Mrs Rosetta , 77 , made drink using chocolate sachets . Husband , son , two grandchildren and their friend all got food poisoning . Police traced cause to hot chocolate sachets which expired in 1990 . Sachets likely bought in late 80s , while Rosetta was still Prime Minister .
Woman , named as Mrs Rosetta , 77 , made drink using chocolate sachets . Husband , son , two grandchildren and their friend all got food poisoning . Police traced cause to hot chocolate sachets which expired in 1990 . Sachets likely bought in late 80s , while Thatcher was still Prime Minister .