National Highways has appointed WSP to lead of a group of firms supporting delivery of its Water Quality Plan, but the government-owned company is still refusing to be straight with the public about whether the plan can be afforded.
WSP, which has been technical partner on the programme since 2024, said that under the new contract it will lead as National Highways’ technical partner, supported by Mott MacDonald, Ramboll, Arup and AECOM, providing programme leadership, technical assurance and delivery support.
Its announcement appeared to give a hint as to how National Highways may deliver the 250 interventions that it is still promising to make by 2030, but which its regulator previously said were unaffordable.
The project will identify and deliver designs to treat water running from the highest risk outfalls on the strategic road network. Treatment will include either nature based solutions or mechanical approaches delivered within the existing road boundary.
Working closely with National Highways, WSP will continue to support the development of a long term, evidence led approach to water quality, ensuring interventions are targeted, proportionate and aligned with wider environmental goals.

The first bit is perhaps ambiguous as to whether all schemes will be within the existing road boundary, or just the “mechanical approaches”.
As I have reported, when the Office or Rail and Road advised in November that National Highways could not afford to mitigate 250 sites at high risk of polluting the environment, it said:
For some schemes land is required beyond the highway boundary. Consequently, estimated costs have more than doubled to between £900,000 and £1.2m per asset.
So, have the company and WSP scaled back or ruled out some interventions outside the highway boundary to save money, or is it just a badly worded announcement?
Scaling back would certainly be consistent with the suggestion that interventions should be targeted and proportionate, words that are usually code for cutbacks.
Replying to a question from me on LinkedIn, David Symons of WSP wrote:










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