Prime Minister Theresa May, who's come under fire for her handling of the situation, acknowledged Saturday that the response "was not good enough".
I have heard the concerns and I have ordered immediate action across the board to help victims' relatives and the survivors.
Fifty-eight people who were in London's Grenfell Tower are still missing and are presumed to be dead, United Kingdom police announced on Saturday, raising the death toll in an inferno earlier this week that turned the public housing block into a charred ruin.
Ronnie King, the UK's former chief fire officer, told Al Jazeera: "I wouldn't wish to denigrate those who installed the cladding because - whatever the cladding was - it did not have to be fire resistant under the building regulations", said King.
"We've worked tirelessly to confirm the number of people who we believe were in the tower on the night and, at this time we can not assume they are safe and well", he said.
Firefighters took more than 24 hours to bring the blaze under control.
She has promised to set up a public inquiry and pledged £5 million (NZ$8.8 million) to help the victims.
Ciao Juventus, Grosso nuovo tecnico del Bari
Sono stato in un ambiente che mi ha fatto crescere, mi ha stimato e mi ha fatto sentire importante: non lo dimenticherò mai. Fabio Grosso saluta la Juventus e si appresta a vivere la sua prima esperienza su una panchina di una prima squadra.
"The response of the emergency services, National Health Service, and the community has been heroic", May said in a statement.
Elsewhere, an angry protester attempted to rally the large crowd to march on the Prime Minister's residence on Downing Street.
Kensington and Chelsea Town Hall became another flashpoint on Friday with protesters storming the building, accusing authorities of ignoring them and of forcing low-income families to live in sub-standard housing.
But unlike opposition leader Jeremy Corbyn and London Mayor Sadiq Khan, who was confronted by a young boy asking "How many children died?", May did not meet with residents, prompting criticism from locals, media and within her Conservative party.
After a turbulent three months which has seen Britain scarred by three deadly Islamist militant attacks and now the tower blaze, Queen Elizabeth said the mood was deeply somber but that the British people were resolute in the face of adversity. It does not matter why you have not told us, what is important is that we know you are safe.
"Seeing the building made a big impact and I think the thing that really hit home for me was seeing that wall [of tributes]".
"As soon as we can, we will locate and recover loved ones", he added. "I knew them. I watched the flames".
Cundy said the police investigation into the blaze would look at the building and its refurbishment in 2016 and vowed to prosecute people "if there is evidence". "We have cancelled the spiritual retreat so that we can offer bedding to people", said Tabassum Awan, who is volunteering at the mosque.