The father of a boy who died after plunging 18 storeys has called for action on the windows of the Kensington tower block.

Christian Castano, 10, who lived in Whitstable House, Silchester Road, North Kensington, fell from his kitchen window on Saturday, May 31, while calling to his friends in the street below.

An inquest on Wednesday at Westminster Coroner's Court revealed he had been sitting on the window ledge with his legs hanging out when the window had opened wide enough for him to slip out. He died of his injuries in hospital later that day.

The schoolboy, who attended Avondale Primary School in Sirdar Road, Notting Hill, left behind two younger brothers, Andre, nine months, and Steven, eight, who tried to grab Christian when he saw him lose his balance on the ledge.

His father Alex Castano, 25, says he thinks the landlords of the block, Kensington and Chelsea Tenant Management Organisation (TMO), should be doing more about the windows, which open bottom outwards.

"I want to start a campaign to have something done," said the gym instructor who lives in Avondale Park Road, Notting Hill. "The TMO are not doing anything about it."

A TMO spokesman said that bottom-opening windows are commonly installed in a wide variety of residential accommodation - including high-rise blocks.

"This design has not been identified as high risk and there is currently no plan to replace them," he said.