Performance record from a 1-hour test, detailing distance, speed, and best lap time.
| Identifier | ExFiles\Box 160\4\ scan0097 | |
| Date | 18th July 1939 guessed | |
| 1 Hour 114 miles 1123 yards = 114.64 mph or 184.49 KPH LAP NO. Best Lap 115.02 1379 | ||
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).