Building understands that O’Neill was unhappy with the new structure, which added a design and space-planning arm to Inspace’s fit-out business.
Karim Khan is heading the fit-out arm, and Gerry Graville is in charge of design and space-planning.
Willmott Dixon refused to comment, and said it had signed a confidentiality agreement with O’Neill.
Willmott Dixon expects Inspace’s turnover to reach £25m this year, compared with £20m last year.
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