Billy, 8, takes on marathon task as hospital 'thank you'
An eight-year-old boy with a rare medical condition is running 26 miles to raise money for the hospital which cared for him.
Billy Roe has Prader-Willi syndrome, which reduces muscle tone and makes moving difficult and painful.
Throughout August, Billy is racking up the total distance of a marathon in aid of Sheffield Children's Hospital.
Leanne Roe, his mum, said "he gives everything a good go and he's so determined".