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).
Recommendation for the best fuel, 'Azure', for the 25/30 HP model when used abroad on the Continent.
| Identifier | ExFiles\Box 150\1\ scan0308 | |
| Date | 30th July 1937 | |
| 1282 W/S. {Derby Works / Sales} Cx. {Major Len W. Cox - Advertising Manager} from Rm. {William Robotham - Chief Engineer} Rm {William Robotham - Chief Engineer} 2/R.30.7.37. FUEL FOR 25/30 H.P. ABROAD. Cx {Major Len W. Cox - Advertising Manager} 11/ES.28.7.37. The best fuel we know of on the Continent is "Azure". Rm. {William Robotham - Chief Engineer} | ||