Wessex Archaeology was commissioned by J Murphy and sons Ltd, to undertake archaeological evaluation of a 19.4 ha parcel of land located along the railway line between Blackthorn and Piddington in Oxfordshire and Buckinghamshire. The evaluation area is between NGR 462538, 220179 and NGR 464829, 217733. Additional archaeological monitoring of a topsoil strip centred on NGR 463631, 218899 was also undertaken for a proposed spoil storage area as part of the archaeological monitoring works. The evaluation consisted of the excavation of 23 archaeological trial trenches along the proposed route of a new access road either side of the railway. A total of 60 trenches were proposed for the scheme, 13 of which were identified as having existing site constraints which made excavation not feasible and a further 24 were inaccessible during fieldwork due to ecological constraints and/or flooding. The monitoring of the topsoil strip was within a 4000 m2 parcel of land to the north-west of the bridge rail crossing, within the field occupied by trenches 21 and 22.