Anyway, when I was a child, visits to Sybil and Walter were eagerly awaited. We'd get to feed hens, collect eggs, dig vegetables, pick fruits that would be miraculously transformed into a table-full of good food.
And Walter would, on rainy days, get out the paper and pencils, and we would draw. The paper had other stuff already on the back. Printed in blue, stuff about boost gauges for a Rolls-royce aero-engine, or the wingroot modifications for the Mark IV English-Electric Lightning, the fastest supersonic interceptor in the world... Or the nitrogen tank modifications on the Victor nuclear bomber..
Or something unknown on a Percival Aircaft. Probably a Percival Proctor.As here.