Sir – While Cyclox does not defend cyclists without lights, the author of your report (Clampdown on cyclists sees 110 stopped, Report, December 4) on cyclists stopped without lights needs a refresher course in statistics.

He states that 89 per cent of cyclists were riding without lights which may pander to some readers’ prejudices so needs correcting.

Of course the police were only stopping those who seemed to have no lights, and 11 per cent turned out to have lights after all. May I also take the opportunity to answer Graham Kelly’s question about cycling and health.

He will be pleased to know that study after study has shown that regular cycling increases life expectancy by several years. Cavill N & Davis A (2007) Cycling and Health: What’s the evidence? Cycling England, London (available at http://www.ecf.com/wp-content/uploads/2011/10/Cycling-and-health-Whats-the-evidence.pdf)

Dr Andy Chivers, GP and Cyclox committee member, Oxford