The Thame Valley Walk was created in the 1990s under the auspices of the Aylesbury Countryside Management Project, which was funded by Aylesbury Vale District Council and based at Haydon Mill at the bottom of Raban’s Lane. This initiative closed some time ago and the route has not been maintained for many years, but it is still quite walkable and is shown on the Ordnance Survey 1:25,000 map (Explorer sheets 180 and 181). On the ground, most of the signs and way markers are still in place though some are faded or broken.
The route is about 22Kms (15 miles) long and follows existing rights of way so there is no problem with access. It is all in Buckinghamshire, starting at Haydon Mill in Aylesbury (map ref SU 793 142) and ending at Manor Farm at Albury (SP663 048), where it joins the Oxfordshire Way about 3 kilometres west of Thame.
You can download the original brochure and guide in PDF format from http://www.buckscc.gov.uk/media/951438/Thame_Valley_Walk_Leaflet.pdf
Haydon Mill is at the bottom of Rabans Lane on the west side of Aylesbury and is 2.8 kms from Aylesbury Vale Parkway railway station and 1km from the A41. An alternative starting point, which is both easier to reach by bus and more picturesque, is from the A418 at Hartwell (SU 794 122).
At the Aston end of the route, you are close to the A418 at Tiddington where there are frequent buses to Thame and Oxford. Alternatively you may choose to continue walking on the Oxfordshire Way, from which it is possible to walk the entire length of the River Thame on footpaths, to Dorchester-on-Thames and the confluence with the River Thames.
The gallery below shows some of the scenery along the walking route from just below Aylesbury to the end of the walk at Albury.