One section of the 600-page writ, filed at London’s Technology and Construction Court, is dedicated to claiming back money from the Australian contractor’s battles with concrete firm PC Harrington, M&E contractor Honeywell and Hollandia, which took over the steelwork when Cleveland Bridge walked off site.
Multiplex is claiming more than £2.4 million of the £10.7 million it spent on legal costs defending the three claims.
The writ says: "A significant amount of the litigation costs were incurred by Multiplex in commercially defending its position and dealing with claims by its subcontractors… [caused by] Mott’s breaches and/or negligence."
Multiplex revealed it spent more than £5.2 million on legal costs and £1.8 million on expert fees in the PCH dispute alone.
The stadium’s main contractor is suing Mott MacDonald for a total of £253 million over the troubled scheme, claiming the international engineering consultancy was the main culprit for the delays and problems on the high-profile job.