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 comparison table for Phantom III cylinder liners from various manufacturers.
| Identifier | ExFiles\Box 132\4\ scan0026 | |
| Date | 2nd December 1936 | |
| Attached to RHC.{R. H. Coverley - Production Engineer}6/MJ.2.12.36. PHANTOM 111 CYLINDER LINERS C O S T. Makers. | Type. | Castings. | Machining & Hardening. | Complete. | Remarks. Sheepbridge Company. | Hardened by Heat Treatment. | 3/8d.ea. | 17/7d. ea. | Up to Nickel Deposit & Grinding stage 21/3d.ea. | Fitted Standard on all Phantom 111. Brico. | Hardened by Heat Treatment. | 3/10d.ea. | 15/11d.ea. | Up to Nickel & Grinding stage 19/9d.ea. | Samples ordered. Hepworth & Grandage, Bradford. | Soft. Brinell about 250 | 5/7d.ea. | 6/5d.ea. | 12/0d.ea. | Samples ordered. Rolls-Royce. | Soft. Brinell about 250. | 3/8d.ea. This incl. casting time & material. | 9/4d.ea. | Estimated cost 13/0d. ea. complete. + | Rolls-Royce. | Hardened. Brinell about 400. | | | Estimated cost 14/6d.ea. | Additional cost on account of extra grinding. | ||