Andy Mitchell, chief executive of Thames Tideway, is due to step down following the completion of the £5 billion super-sewer project in London, one of the UK’s most significant infrastructure projects.
After nine years of construction, the 25km Thames Tideway Tunnel, designed to reduce sewage overflows and improve water quality in the River Thames, became fully operational in February.
The tunnel has already captured 9.3 million tonnes of sewage since August 2024 from several previously polluting spill points, helping to ensure cleaner waterways for future generations.
Mitchell, who has steered the project since the development consent was granted in 2014 – a crucial step that provided the legal foundation and approvals for the project to proceed – will depart next year following the project’s delivery.
A spokesperson for Tideway confirmed the announcement, saying: “With the project coming to a successful conclusion, Andy will be stepping down in spring next year, as planned.”
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Mitchell, who has had a long career in the UK’s infrastructure sector, previously held senior roles in major projects including Crossrail, where he served as programme director, and Network Rail, where he oversaw the £4 billion Thameslink programme.
He also led projects such as the Southern Power Supply Upgrade and worked internationally on the West Rail project in Hong Kong.
His experience in managing complex, large-scale engineering projects, including the Elizabeth Line and the Blackfriars station redevelopment, was pivotal in the delivery of Tideway.
The Thames Tideway Tunnel project, managed by US firm Jacobs and involving major contractors such as Amey, Balfour Beatty, Costain, Laing ’O Rourke, and various joint ventures, was delivered close to the initial £4.2 billion budget, and on schedule – a notable achievement amid the UK’s ongoing struggles with large-scale infrastructure projects like HS2.
Despite cost increases due to unforeseen challenges, including a Victorian gas main and COVID-19 disruptions, Mitchell’s leadership ensured it remains a model for future UK infrastructure.
No official update has been provided regarding the timeline for Mitchell’s replacement.
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