Post-mortem examinations will take place today for the three children who were found dead at a property in New Malden. A 42-year-old woman arrested on suspicion of murder remains in police custody.
A neighbour has described three children who were found dead at a property in New Malden as "happy" and "lovely".
Joy Devis, 86 said news of the deaths was a "huge surprise and shock".
"Their children were super, lovely children. They were very happy, there was a very nice atmosphere there," the retired nurse said.
It has been reported that the three children suffered from life-limiting genetic conditions.
An elder child, thought to be around seven or eight years old, also living at the house, was in good health.
She said the parents, named locally as Tania and Gary Clarence, received help from a nanny and a maid.
A lamp in the tower which houses Big Ben is to be switched off for the first time in more than 70 years.
Sir Bruce entertained audiences for more than seven decades.
Work in the tower will also pause over the bank holiday weekend.