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 for a top decarbonisation job.
| Identifier | ExFiles\Box 107\2\ scan0056 | |
| Date | 13th June 1941 guessed | |
| Average cost of Labour for 4 cases of Top decarb Skilled hrs 15 1/2 semi skilled hrs 9 1/4 Actual cost of Labour £ 1 . 11 . 8 " " Material £ 1 . 0 . 6 | ||