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).
Confirming the lower radiator cap is on the new 20 HP car being built.
| Identifier | ExFiles\Box 105\1\ scan0062 | |
| Date | 21th March 1930 | |
| X5-50 RHC.{R. H. Coverley - Production Engineer} From Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}2/MJ.21.3.30. We want to make sure that the lower radiator cap is on the new 20 HP. car that we are building. Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer} | ||