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Lenders, including NatWest and Nationwide, are now withdrawing mortgage offers to people hoping to buy flats with fire safety certificates issued by Mr Kiziak's company, Tri Fire.

Tri Fire carries out safety surveys and issues fire safety certificates for flats in high-rise blocks across the UK.

There is no official register of EWS1 certificates, but analysis by the Building Safety Register has found 410 of the 1,139 EWS1s signed off between March 2020 and the end of 2021 were issued by Tri Fire.

Awwal Salisu, a qualified fire engineer based in Saudi Arabia, told the BBC he entered into an agreement with Tri Fire via a recruitment agency to assess up to 100 buildings.

First-time buyer Sam Ireland told the BBC his mortgage offer was retracted when his lender discovered the fire safety assessment of the property he hoped to buy had been issued by Tri Fire.