At first glance this might seem an unusual title to review on an aviation site, but the sub-title of the book shows why - "The story of the buses that served RAF Biggin Hill and the surrounding area". Indeed many enthusiasts will have used this service between Bromley station and the airfield when visiting Air Fairs or Battle of Britain displays.
A small 32 page booklet on high quality paper, this covers the development of route 410 from June 1922, with additional coverage of earlier services from September 1913. Many of the various bus types used on the route are illustrated, including special low-height versions because of the low bridge at Oxted.
There are also 5 pages giving a brief overview of RAF Biggin Hill and an explanation of the chit "410" given to aspiring entrants to the RAF who did not make the grade.
Ah yes, I remember those low height RLH 410 buses and it was possible to cover Gatwick, Redhill and Biggin in one day around 1961 with a Green Rover ticket from Staines (including about 4 miles on foot around Redhill)...a bit heroic, tended to be dark when you got back to the Heathrow area :-)