Officers who deliberately conceal their identification numbers will face the sack, Britain's top policeman has said.

Metropolitan Police Commissioner Sir Paul Stephenson said it was "totally unacceptable" not to wear the numerals.

His comments follow allegation against several officers at the G20 protests - including the man who pushed newspaper seller Ian Tomlinson before he died.

New footage has emerged of the moments leading up to his death, as a third post-mortem examination was held.

The footage is in the link.  It doesn't support the police claim that there was a confrontation prior to the attack.