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.
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The 20-year-old was found fatally wounded on Roth Walk, near Finsbury Park, north London at around 3am on Saturday, Scotland Yard said.
Police have arrested a man wanted in connection with a burglary at the home of pensioner Richard Osborn-Brooks.
The rally comes after it emerged that the Home Office destroyed thousands of landing cards documenting the arrival of windrush-era migrants