Someone knows what happened that evening and I am urging them not to remain silent but to come and speak to us. Your information will be treated in the strictest of confidence.
Likewise I am directly appealing to the family members and friends of those believed to be involved - if you have slightest indication the person you know may have been involved in this incident I encourage you to get them to hand themselves into the police.
Failing to do so will result in my officers pursuing them.
More top news
Transport for London teamed up with a host of recognisable voices to encourage Londoners to support the Royal British Legion.
She will be joined by chart acts Rixton and Jess Glynne when she presses the button for the festive illuminations on November 6.