Walliams vs The Thames Day 4 | Sport Relief 2012

David digs deep on day 4; fighting back against Wednesday's 'day from hell', when he suffered from sickness, diarrhoea and mounting exhaustion. And with the halfway point almost in sight he receives an overwhelming reception from the riverside in Reading. To follow David's progress visit http://www.sportrelief.com/walliams and to sponsor him visit http://www.sportrelief.com/swim As the nation celebrates the biggest ever year of sport, the entire country can join in the fun with Sport Relief 2012 from Friday 23rd to Sunday 25th March. Enter The Mile: http://www.sportrelief.com/the-mile Like Sport Relief on Facebook:   / sportrelief   Follow us on twitter:   / sportrelief