John Walsh was working for Ferson, a subcontractor on the Cardiff Bay site, when the cavity wall he was filling with concrete blew, throwing him backwards.

On the day of the incident, Walsh was on a ladder directing the hose of a concrete pump into the cavity. When the wall was pushed out by the weight of the concrete Walsh’s ladder was thrown backwards. As he fell to the ground he struck his head, suffering fatal injury.

Judge Neil Bidder QC, sitting at Cardiff Crown Court, said the foreman had “tragically and unnecessarily” lost his life on 15 March 2004.

He said both Taylor Woodrow and Ferson were aware of the danger of the wall blowing under the pressure of the concrete being placed in the cavity.

The judge said he accepted the "genuine and heartfelt regret" of the Taylor Woodrow's senior management.