As the chart, reflecting betting prices as implied probabilities, shows there has been an easing of Ken’s Mayoral election price and a tightening of Boris’s and most of this has happened in the past 36 hours.

I don’t know what’s driving it. The last major news items were the opinion polls on Tuesday. On the Sporting Index spread market Boris has this morning been priced as the clear favourite.

My only explanation is that Labour is holding its Spring Conference in Birmingham and possibly gloomy predictions about Ken’s chances are being discussed. We do know that a lot of private polling has been commissioned.

Mike Smithson