Blakestone joined the £100m turnover London fit-out contractor in June 2020 from ISG where he had spent 16 years latterly as managing director of engineering services, growing the division from a standing start to £400m in four years.

He was brought in by US owners STO Building Group as part of a new management team investment to turn the business around after several years of losses.

Blakestone bought several former ISG colleague with him to run the business, including now commercial director Justin Fahy and Richard Irwin now sales & marketing director.

But despite the effort to turn the business around losses rose to £9.2m in the year to December 2020 from a loss of £3.5m and £7.9m in 2019 and 2018 respectively.

Bill Frederick from the US business is currently now overseeing the London operations as managing director.

Before taking on the role in London, he served as an executive in Pavarini McGovern, an STO Building Group company focused on new building construction in New York City.

A spokesman for Structure Tone said: “By mutual agreement, Danny Blakeston has left Structure Tone and his role as managing director of our London office.

“We thank Danny for his service to our firm, and we wish him the best.

“Our London office continues to be a key location in our business strategy, and we remain committed to our London team and our valuable London-based clients.

“Our fit-out and refurbishment divisions will continue their ambitious investment programme for London.”

Established 32 years ago, Structure Tone (UK), delivers projects up to £75m, although its core business involves contracts under £5m for clients who are renovating or expanding their facilities.