UPDATE - work has been completed for today (10/3) and the ring road is open.
16:00 Tuesday 10/3
The work is currently taking place on the A421 near the London Road Roundabout, with the road closed from the roundabout towards Buckingham.
Anglian Water crews are digging down to repair a damaged drain cover and frame, and the road closure is expected to remain in place while the work is completed.
Technicians are monitoring the repairs closely to ensure safety and progress, while motorists are advised to expect delays and diversions around the Buckingham Ring Road. If possible, please plan alternative routes when travelling towards Milton Keynes.
Further updates about the emergency works can be found via the official link here (external link)

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