From White Waltham go north to Henley, then turn south west and follow the Thames at low level towards Reading. When you run out of river, turn south and do a few orbits overhead the old Roman town of Calleva (Silchester) which is just south of Reading and the M4. Then, if its a clear day request a special VFR, from Bracknell to the Ascot racecourse and back, from Heathrow radar.