A grandad's set himself a challenge of running up to 30 kilometres a day through Dartford, every day for a year to raise money for Dementia UK.<br /><br />Bryan Wilson turns 70 tomorrow and will be celebrating the 365th run of his mammoth challenge which has seen him raise more than 800 pounds.<br /><br />He says he wants to raise money and awareness around dementia research after his aunt was diagnosed.