Has clamping down on drugs made the Tour de France slower?

Published: July 20, 2012, 3:35 p.m.

The Tour de France, we are told, has finally cleaned up its act and clamped down on the use of performance-enhancing drugs. But if it has, should we expect today\u2019s drug-free riders to be slower than their drug-fuelled forebears? Can statistics tell us whether the Tour de France really is cleaner than it was? Also in the programme: does when you retire influence when you die?