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).
Note confirming that trials car GUL-1 is not equipped with L shaped rings.
| Identifier | ExFiles\Box 96\3\ scan0126 | |
| Date | 29th October 1936 | |
| To Cx{Major Len W. Cox - Advertising Manager}: C. to Hs.{Lord Ernest Hives - Chair} X. to Mx.{John H Maddocks - Chief Proving Officer} S/60. Rm.{William Robotham - Chief Engineer} 3/JR.{Mr James Royce} 29.10.36. Trials car GUL-1. This car is not fitted with L shaped rings. Rm.{William Robotham - Chief Engineer} | ||