That closure is already an officially planned one by Cadent, so it should already be in Waze if the map editors have processed it. The details match the official notice: The Pound is closed between Maidenhead Road and Terry’s Lane in both directions from 27 July to 16 August (with traffic lights replacing the closure from 17 August).
If you still find that Waze is routing traffic through it, you can submit this information to the UK Waze editors:
Road: The Pound, Cookham, Berkshire
Closure: Full road closure – both directions
Section: From Maidenhead Road to Terry’s Lane
Dates: 27 July 2026 to 16 August 2026
Reason: Cadent gas main replacement works
Multiple road closure for this area over there next month or so.