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“Requirements that discourage new building may have a paradoxical effect on fire safety, as people instead continue to live in older buildings that are more vulnerable to fire risk, because they were usually built without modern fire-rated materials, compartmentation, and active fire protection features,” the report concludes.

"It is quite clear these defects are not the fault of the leaseholders and so they shouldn't be expected to pay for compartmentation failures," he said.

London Fire Brigade shared data with 5 Live Investigates showing that of the 576 blocks which have a "waking watch" - considered such a fire risk they need overnight fire wardens - more than 100 had compartmentation problems.

An early fee proposal by Exova for a fire assessment of Grenfell Tower in 2012 also assumed a "detailed appraisal" of the building's fire compartmentation was unnecessary because it was a "concrete building", she told the hearing.

"We need to do a full investigation of this building because it's not just about the cladding, it's about the actual structure of the cladding system and we need to investigate whether compartmentation has been breached and a whole host of different issues".