A4130 closed due to overturned vehicle between B481 Watlington Street (Nettlebed) and B480 (Lower Assendon).
Diversion - eastbound traffic to divert onto the B481 then onto the B480 to Lower Assendon, westbound traffic to take the B480 then the B481.
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Captain Mike Green, a senior flying instructor, was piloting the two seater helicopter involved in the crash.