The leader of the council dealing with the Grenfell Tower fire has resigned following criticism of his handling of the disaster.
Nicholas Paget-Brown said he had to accept responsibility for "perceived failings" by Kensington and Chelsea Borough Council after the tragedy.
"I have therefore decided to step down as leader of the council as soon as a successor is in place," he said.
At least 80 people are dead, or missing and presumed dead, from the inferno that destroyed the 24-storey Grenfell Tower block in west London on 14 June as families slept.
To date, some 149 high-rise buildings have failed safety tests introduced after the fire, a spokeswoman for British Prime Minister Theresa May said.
"So far the cladding from 149 high rise buildings in 45 local authority areas have failed the tests. That continues to be a 100% test failure rate," the spokeswoman told reporters.
Downing Street has also issued a rebuke to Kensington and Chelsea council after a meeting to discuss the fire tragedy was cut short because of the presence of reporters.
The spokeswoman said that Mrs May's view was that the council should have "respected" a High Court ruling that the press and public should be allowed into the meeting, which was originally slated to be held behind closed doors.
The row had increased pressure on Mr Paget-Brown, following reports that cladding used during a multi-million pound refurbishment of Grenfell Tower was switched to a cheaper version.
Both The Times and the BBC said they had seen official documents which stated aluminium panels were preferred to the non-combustible zinc alternative.
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Yesterday, Mr Paget-Brown apologised for the authority's response to the tragedy.
He called the council meeting to an abrupt close, saying that he had received legal advice that the presence of journalists would "prejudice" the inquiry into the tragedy being led by retired judge Martin Moore-Bick.
Asked for Mrs May's response to the shutdown of the meeting, the Number 10 spokeswoman said: "Our view is that access to democracy should always be easy and we think that is vital if people want to retain confidence in our democratic system.
"I can't speak for the council, but there are rules that state that all meetings must be open to the public except in certain circumstances.
"In this specific case, the High Court ruled that the meeting should be open, and we would have expected the council to respect that."
Asked whether the PM retained confidence in the political leadership of the Conservative-run council, the spokeswoman said: "We are working very closely with Kensington and Chelsea throughout the ongoing recovery process.
"The view I've given you about the meeting is the Prime Minister's view on that issue."
