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).
The timing of trunk calls between London and Derby.
| Identifier | ExFiles\Box 142\3\ scan0088 | |
| Date | 1st January 1937 | |
| 1204. TO: Rm.{William Robotham - Chief Engineer} D1/DL4.1.37. Sg{Arthur F. Sidgreaves - MD} requests that the following be circulated : "Please bear in mind that trunk calls between London and Derby should, whenever possible, be confined to the special reservation we have daily from 3 p.m. It is seldom that a trunk call is so urgent that it cannot wait until then." D.{John DeLooze - Company Secretary} | ||