“I think we can’t be certain that what we know now is any better than what we knew two weeks ago,” he said.The Tory peer said the tests focused on the core of the panel, which is sandwiched between aluminium plates, rather than the panel as a whole – including the metal skin.”On those panels they will fail because the thing that is being tested at the request of the experts isn’t the right thing to test,” he said. “We need to test the whole panel.” “The tests are not testing the fire safety of the panels, they are testing what the core of the panel is made from. That’s not what the test needs to be.” There is no suggestion that a deliberate decision was made to cut fire safety at Grenfell.The Times and BBC claim to have seen emails which they say suggest a focus on cost-cutting before the refurbishment of the west London block that cost £8.6million and was finished in May last year. Meanwhile, the chairman of the Local Government Association has claimed that fire safety tests on cladding from high-rise buildings are flawed and the Government needs to rethink its approach.Every cladding panel tested in the wake of the Grenfell Tower tragedy has failed, but Lord Porter of Spalding criticised the way the examinations were being carried out. Lord Porter said tests should also be carried out on the insulation material packed between buildings and the exterior cladding panels.”They are not testing the whole system anyway because we should be testing the insulation. There’s more than a good chance that the insulation is probably the main problem, if it’s the wrong kind of insulation.”He told BBC Radio 4’s Today programme: “I’m saying the Government needs to listen to a wider set of opinions and not just the experts they have got.”The experts, they may well be right, but we can’t have confidence in that because every single one has failed across the whole country.”There are 17 councils where failure has taken place, there are 27 registered social landlords where failures have taken place and they have only just started testing private properties and 12 of those have tested… it’s up north, down south, Labour councils, Lib Dem councils. Fireproof cladding at Grenfell Tower was downgraded to save money, it has been claimed.Consultants for the refurbishment of 24-storey block were placed under pressure to keep costs low, leaked emails reportedly show.The documents show that non-combustible zinc cladding, which was originally proposed, was changed to a cheaper aluminium version that had the same fire rating. The move is said to have saved £293,000.The exterior cladding, designed to improve the look of the tower and make it more energy efficient, has been blamed on contributing to the rapid spread of the fire that killed at least 80 people. Want the best of The Telegraph direct to your email and WhatsApp? Sign up to our free twice-daily Front Page newsletter and new audio briefings.