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).
List of modifications and their design status for the 20/25 HP Chassis.
| Identifier | ExFiles\Box 30\3\ Scan046 | |
| Date | 7th January 1935 guessed | |
| (7) ITEM. DESIGN POSITION. 20/25 HP. CHASSIS. Modifications to carburetter. In hand. Modified end bracket for pedal shaft. Completed. | ||