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).
Design drawing showing the rear section of a car body, noting a dimension is the same as model 18 EX.
| Identifier | ExFiles\Box 13\6\ 06-page28 | |
| Date | 1st March 1929 guessed | |
| 18FT. - INS. SAME AS 18 EX | ||