The Icknield Way

Section from Watlington towards M40 is very easy walking and looks good for cycling

The Icknield Way is an ancient trackway in southern England that goes from Norfolk to Wiltshire. It follows the chalk escarpment that includes the Berkshire Downs and Chiltern Hills. It is thought by some to be one of the oldest traceable routes in Britain, however, this has been disputed, and the evidence for its being a prehistoric route has been questioned. The earliest mentions of the Icknield Way are in Anglo-Saxon charters from the year 903 onwards. The charters refer to several locations that span a distance of 40 miles from Wiltshire to Buckinghamshire.
nationaltrust.org.uk/chilterns-countryside/trails/watlington-hill-and-the-wormsley-estate--an-emblematic-chilterns-walk

There is so much to explore along these route, it needs to be revisited for sure.