This desktop study, commissioned by Grosvenor Developments Ltd., evaluates the archaeological impact of the proposed extension of the Duxford Airfield Runway at the Imperial War Museum, Duxford, Cambridgeshire. This study is limited to the area of direct development which encompasses approximately 9ha of land at the western end of the present runway (see attached figure). No excavation or systematic survey has taken place in the boundaries of the Airfield, but an extensive fieldwalking programme was undertaken on land immediately to the east of the Airfield in 1989 (Evans 1989), and several findspots are recorded in the County Sites and Monuments Record (SMR). The aerial photographic record of the area of proposed development has also been re-examined as part of this study (see contribution by R Palmer)