New Civil Engineer has some eyeopening confession by Tideway project Chief Technical Officer Roger Bailey.

"efforts to create a precast secondary lining machine were ultimately not delivered in time to be used on the Tideway project`

"Bailey said that the product is now being marketed by Herrenknecht and could be beneficial to future tunnelling projects"

https://www.newcivilengineer.com/latest/tideway-spent-10m-on-tunnel-lining-innovation-that-it-will-never-use-12-12-2022/