Have any Politicalbetting.com users any idea why the price on Steve Norris has collapsed during the day. It was upto 17.5 at one stage and then went to below 9. Meanwhile the Ken Livingstone and Simon Hughes prices have risen sharply.

At 1815 Ken was up to 1.1 – or double what was available just two days ago. Hughes was at 32 and Norris at 9.8 – a drop of nearly half on the day.

We were expecting the final YouGov poll to be published today. This does not seem to have appeared. Is there some hard advance information about the poll or are there just rumours?