text:  Sarah Smith. Here in Britain, a woman has admitted giving her terminally ill son a fatal dose of morphine more than 40 years ago. Antonia Cooper says her son Hamish, who was seven at the time, was in great pain after months of gruelling cancer treatment. She says she's decided to tell the story now in a bid to change the law on assisted dying and assisted suicide, which are both illegal in the UK. Sophie Law reports.