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).
Cost analysis table for different types of body shells based on batch size.
| Identifier | ExFiles\Box 111\1\ scan0127 | |
| Date | 13th August 1938 guessed | |
| Handwritten in top right: 45. TABLE: Type of body shell. | Number in Batch. | Tool Cost per batch. | Total material cost including tool cost per body shell. B.2. | 50 | | £65. Approx. B.3. | 250 | | £24.17.1. B.50. | 1,000 | £1,000 | £18.0.8. | ||