More than 400 sites were visited by HSE inspectors with 93 failing checks.

Inspectors issued 114 Prohibition Notices and 22 Improvement Notices during the blitz

Andy Beal, a Principal Inspector for Construction in London, who co-ordinated the construction initiative, said: “It’s good news that the majority of the construction sites we visited were obeying the law but sadly a sizeable minority sites are letting down the rest of the industry.

“Failures to properly protect workers during construction activities at height, inadequate site management, exposure to dangerous types of dust and inadequate washing facilities were among the dangers and low standards we found on some sites.

“The whole purpose of carrying out these spot checks is to raise awareness of the dangers and reduce the number of construction workers being killed or seriously injured at work.”

A close up of the dangerous scaffold