It sounds close to the official number
as quick glance at BBC news's website shows. Nothing to do with collusion, people keep talking about all of the CCTV camera's in the UK police have been identifying people through that. Most of the papers have also been printing pictures of rioters in an effort to identify them, there are about half a dozen stories of mothers turning in their kids when they saw the child's photo in a national paper.
This meeting is the higher ups way of looking like they are doing something to daily mail readers, I'm hoping nothing comes of it especially when you realise Twitter & Facebook were used by people to organise clean-ups and identify the rioters.
There has also been a lot of talk about the harshness of the punishments handed down to rioters. The UK doesn't require mobile phones to have Government available GPS tracking like the USA. You can only check-in with Facebook/Google latitude and not twitter.