David Radcliffe, 43, from Isleham, will take on the South Coast Ultra Challenge on September 5 and 6 to raise money for Just George, a fund supporting childhood cancer research through CCLG: The Children & Young People's Cancer Association. David Radcliffe (Image: Supplied)Mr Radcliffe said: "George was born a smiley, happy, active boy. The challenge will take him through the South Downs National Park from Eastbourne to Arundel. George Radcliffe (Image: Supplied)George’s mother, Lisa, described her son as endlessly resilient. Following George's death, his family established Just George to help fund research into rhabdomyosarcoma and improve outcomes for future children diagnosed with the disease.