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I have to query statements that make out the installation of the cladding was according to standards.

Which standards accept flammable cladding?

And if it is Part B, then surely the requirement to upgrade other elements of the building would also be required? Otherwise you could end up comprising a building by downgrading one element to a latest standard, while not upgrading other elements that are required to compensate e.g. sprinklers, compartmentation, smoke extraction, and so on.