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).
Statement on the minimum time required for production preparation, noted as four and a half months.
| Identifier | ExFiles\Box 98\1\ scan0303 | |
| Date | 21th October 1941 | |
| - 2 - The minimum time required to prepare for pro- duction, dealing with the work as set out above, would be 4 1/2 months. Rm{William Robotham - Chief Engineer}/EAG. 21.10.41. | ||