News seems quite quiet out of London Boroughs, but not from other places. Sensibly it seems news agencies have been asked to keep schtum, which will probably go some way to keeping tonight quieter than either Saturday or Monday. No evidence, just a hunch. Making the police presence sound intimidatingly large, publicising the thoroughness with which riots will be met tonight and keeping very, very quiet any successful rioting sounds like an excellent way to intimidate people off the streets, which may be exactly what we need.
UPDATE: Nah, changed my mind. I think it is actually just relatively still in London tonight, especially compared to the other parts of the UK.