Canoe Double (C2) heats August 24, 2012 Lee Valley White Water Centre, Hertforshire, UK. 28/07/12 Picture by Jason Alden.London 2012 Olympic Games. Canoe Slalom: Mens Canoe Double (C2): heats. Great Britains, David Florence (left) and Richard Hounslow (right) take part in the C2 event.