From the Rolls-Royce experimental archive: a quarter of a million communications from Rolls-Royce, 1906 to 1960's. Documents from the Sir Henry Royce Memorial Foundation (SHRMF).
Stating the total mileage of a Humber Car.
| Identifier | ExFiles\Box 126\2\ scan0026 | |
| Date | 13th March 1931 guessed | |
| X1525 Total mileage of Humber Car - 1283 miles. Hs{Lord Ernest Hives - Chair}/LG. MADE AT CROXLEY | ||