More than 70 buildings have failed Government fire safety tests brought about in the wake of the Grenfell Tower fire tragedy.
Here is what we know so far.
Grenfell Tower was recently refurbished with Reynobond PE cladding, made by US firm Arconic. It consists of Reynolux-coated aluminium sheets over a Reynobond polyethylene core, suspected to have accelerated the spread of the deadly blaze on June 14.
Tests carried out as part of their investigation found the cladding and the insulation “don’t pass any safety tests”, police said. The Department for Communities and Local Government (DCLG) has asked local authorities to send in samples from high rises for testing.
It is understood the combustibility test, which no building has yet passed, grades the sample on a fire-resistance scale of one to three, with those in two and three being considered a fail.
Sajid Javid explained to the Commons: “The combustibility test has three categories rated one to three and it is judged that cladding material in categories two or three does not meet the requirements for limited combustibility in building regulations.”
Each test is believed to take a number of hours, and councils are informed immediately of the results. Housing Minister Alok Sharma assured the BBC the Government was “literally working around the clock” to test samples.
The Government previously said it could test around 100 samples a day. A spokesman for Theresa May said they were nowhere near reaching that number. Ministers have suggested the delay is down to councils not producing the material quickly enough.