The documentary makers behind Grav: Sdim Cywilydd Mewn Llefain (There’s No Shame in Crying) followed the Welsh Grand Slam winner and broadcaster in the summer of 2007 with the aim of charting his recovery.
But when he died of a heart attack on holiday in Spain on October 31, 2007, the programme was shelved.
Now, the much-loved rugby star’s wife Mari has given permission for it to be broadcast on S4C on New Year’s Day in order to raise awareness of diabetes.
The programme features Gravell taking his first steps on a prosthetic right leg after his own was amputated below the knee because of his diabetes in April 2007.
Gravell’s widow says that before his heart attack the programme helped her husband’s recovery because he believed it would help improve understanding of diabetes.
“It was a terribly difficult time, but it was something that Ray wanted to do,” she said. “It was therapeutic for him. He was doing something positive in a difficult situation.
“Of course there were times when he was very low. But somehow, talking about things made him feel better.
“For the whole family of course it was a difficult time, but we were lucky that we got along well with the film crew, and we are glad that we did it now.”