INFORMATION:

RAF Turweston, Buckinghamshire is west of Brackley. Take the A43 north and after the last roundabout of the Brackley bypass turn right to Turweston Aerodrome (Witfield), continue through the village and over the small river and up the hill to the airfield.

OS Ref: SP620387
You can use the Ordnance Survey 'Get a Map' and follow the instructions. Copy and paste the map reference.