The planning documentation for the Lower Thames Crossing, a proposed tunnel under the Thames connecting Kent and Essex, runs to 360,000 pages, and the application process alone has cost £297 million. That is more than twice as much as it cost in Norway to actually build the longest road tunnel in the world.
Much of the discussion is about the metaphysical question of whether the road+tunnel will increase or decrease the emission of CO2. As far as I know, civil works do not produce nor consume CO2 / For those who do not know, CO2 is something invisible produced by, say, breathing. Infrastructure, as a rule, does not breathe.
But we are not far from the Brits.