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).
Estimated cost for extra jigs, tools, and equipment for a modification on the 'D' series.
| Identifier | ExFiles\Box 86\4\ scan0186 | |
| Date | 28th September 1934 | |
| YELV STANDARDISATION of PARTS X Est. cost of extra jigs, tools and equipment (Sft{Mr Swift}/Ws. 28.9.34) £164.0.0. This modification has already been instructed for "D" series, without scrap | ||