My son has an "Ideal" Royal Flying Corps hard back notebook of 2/Lt S. Hawke with notes on ring sight deflection, aerodrome rules, general flying, photography, bombs, RAF 90 hp, Beardmore 120 hp, Clerget 110 hp engines, Vickers light automatic machine gun, observation, recon patrols, Stirling wireless transmitter, among other subjects, all written in ink. The main subjects have several pages and most have hand drawn coloured illustrations. He survived the war but died in the Spanish Flu epidemic. His father was the vicar of Par church.

My son has little interest in the notes (!) and is considering selling them. I wonder what they may be worth?