Peter McCleave has terminal blood cancer and needs a transplant if he's to see his young family grow up.
He's already got 30,000 people to put their names on the stem cell donor register but still hasn't found a match for himself.
So now he's taking part in the Crumball Rally to try to persuade even more people to sign up.
Earlier in the year, Peter's son Maxwell, wrote a [heartbreaking letter](http://An eight-year-old boy has written a heartbreaking letter to ask people to sign up to help save his dad’s life.) to ask people to sign up to the register to help save his dad’s life.
Our Correspondent, Mel Barham has this report:
You can donate to Peter's 'Drive to Survive' here.