His departure ends a 35-year career at Balfour Beatty, which saw him rise through the ranks after starting out as an apprentice electrician back in 1986.

Lafferty is rumoured to be heading for a top job at another large M&E contractor.

A Balfour Beatty spokesperson said: “We can confirm that Simon Lafferty has decided to leave the business to pursue an opportunity outside of the group.

“We would like to thank Simon for his outstanding contribution over the last 35 years and we look forward to welcoming his replacement in due course.”