The construction of the High Speed 2 rail line crosses the OAR at two points, and affects sections 1 & 8 of the route and circular walk 13. The path is curently closed between Waddesdon and Quainton by HS2.
We generally rely on Buckinghamshire Council for maintaining information on closures and diversions arising from HS2 which can be found here.
However, one of our members has kindly provided a detailed review of Section 8