We are going to Home Farm which is near Stokenchurch on the M40 about 40 minutes from Ealing (by car). It is a small farm campsite on the edge of the Chilterns with views to the north west. There is the Crown Inn pub about 100m from the site that has B&B accomodation at £65 per night and serves local real ale directly from the cask.
Photos of the site:
Google Maps view of the site.
Views from the site and of the pub.