When Di Franks asked her doctor about donating her kidney, she wasn't sure she would be taken seriously.
Because Di wasn't giving her healthy organ to a sick and needy relative.. she wanted to donate it to a complete stranger.
Five years ago it was illegal to give a kidney to someone you didn't know in this country.
When it was made legal, inspired by a friend in the US who had themselves donated a kidney, Di was faced with the extraordinary choice.
Should she undergo a major operation to remove a vital organ to help someone she would probably never know ? Not only was she was risking her own life, the choice could have consequences for her son and the rest of her family if they ever needed her organ...