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).
Total cost savings on the Phantom III Chassis, broken down by material and labour.
| Identifier | ExFiles\Box 161a\2\ scan0084 | |
| Date | 10th December 1937 guessed | |
| RM{William Robotham - Chief Engineer} The total save on the P.III Chassis since our figures were issued is as follows:- Material £1-9-0 Labour £1-3-0 Total saving, allowing 175% burden:- £4 - 12 - 3. RM{William Robotham - Chief Engineer}/RC.{R. Childs} | ||