Southwark Crown Court heard how, on 2 March 2014, during night work at a site in Stratford, Kevin Campbell, was struck by an excavator mounted vibrator (EMV) attached to a 35-tonne excavator that he was working in close proximity to.

Campbell had been disconnecting lifting accessories from a metal pile that had just been extracted from the ground when he was fatally crushed against a concrete wall a short distance away.

Another site operative who was directly next to him also faced a risk of being struck.

An HSE investigation found principal contractor Clancy Docwra Limited failed to ensure the safety so far as is reasonably practicable of its employees and of others who were not their employees working on the site.

The investigation also found that Daniel Walsh, who was the site supervisor for the site and the person operating the excavator at the time, failed to take reasonable care for other persons on site at the time.

Clancy Docwra Limited of Middlesex pleaded not guilty to safety breaches and was fined £1,000,000 and ordered to pay costs of £108,502.30.

Daniel Walsh of Orpington, Kent also pleaded not guilty and was given a six month custodial sentence, suspended for 12 months and ordered to pay costs of £15,000.

Speaking after the hearing, HSE inspector Darren Alldis said: “This death was wholly preventable and serves as a reminder as to why it is so important for companies and individuals to take their responsibilities to protect others seriously and to take the simple actions necessary to eliminate and minimise risks.

“If the risks had been properly considered by the company, and simple and appropriate control measures were put in place, then the likelihood of such an incident occurring would have been significantly reduced.

“Informing all site operatives of the specific risks they face when carrying out such tasks and the control measures required of exclusion zones, the importance of communication and the mandatory use of excavator safety levers were simple actions that should have been put in place and their effectiveness monitored.

“All those with legal responsibilities must be clear that HSE will not hesitate to take appropriate enforcement action including where appropriate prosecution against those that fall below the required standards”.

A spokesperson for Clancy Group said: “The effects of this tragic accident have been felt across our business.  Our thoughts and deepest sympathies remain with Kevin Campbell his family and friends at this difficult time.

“We have a responsibility to strive towards an ever-safer construction sector.  As a business, we continue to invest in training, equipment and technology to protect our teams in their work, and guard against an incident like this occurring again.”