By Duncan Leatherdale
BBC News
Judith Gates spent years watching her ex-professional footballer husband Bill disintegrate, his brain damaged by the game he loved. As a new book tells their story, the BBC spoke to Judith about her fight to save future footballers.
When Bill Gates realised his brain was failing, he implored his wife Judith to make him a promise.
"It's too late for me," he told her, "but do everything you can to stop this happening to others."
The former-Middlesbrough and England youth defender had not headed a ball since he retired from football a day before his 30th birthday in 1974.