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).
List of modifications with their associated weight and cost increases.
| Identifier | ExFiles\Box 88\3\ scan0213 | |
| Date | 26th August 1936 | |
| -6- Hs{Lord Ernest Hives - Chair}/Rm.{William Robotham - Chief Engineer}4/KV.26.8.36. Item Weight Increase Cost Increase Bumper Bar 34 lbs. £4.10. 0d. Starter Motor Reduction Gear 4 lbs. £2. 2. 7d. Noise Insulation 20 lbs. About £4. 0. 0d. Isolated Change Speed 2 lbs. £2. 4. 1d. Cross Member between Headlamps 4 lbs. £1.10. 0d. Quick Brake Adjustment 3 lbs. 9. 3d. Strengthening Front Axle 4 lbs. Negligible. 71 lbs. £14.15.11d. | ||