Three children found dead at house in New Malden have been named as four-year-old Olivia Clarence and three-year-olds Ben and Max Clarence.
Tania Clarence, 42, has been charged with three counts of murder.
Post-mortem examinations of the three children are ongoing, Scotland Yard said.
More top news
David Cameron said the Met proved it can "do more with less" and declined to criticise the Mayor of London for his water cannon spend.
A group of disabled activists threw toys and balls at him as he entered the conference.
A wet start to the week and the unsettled weather is set to continue over the next few days.