Maidenhead Heritage Centre
The Maidenhead Heritage Centre was running an exhibition last month on White Waltham and had both old charts and aerial photos of White Waltham. Unfortunately the exhibition closed on the 27th September but it may be worthwhile contacting them to ask if you can have a look. The staff are very helpful.
There was talk of transferring the exhibition from the Heritage Centre to the West London Aero Club but I am not sure if that is still going to happen. Have a word with Catherine Loudwell at the West London Aero Club as she was trying to organise it.