| Description | Date | Identifier | |
| Summary comparing the existing push-rod overhead valve engine with a new 6-cylinder overhead camshaft unit and considerations for the Wraith model. | 1st Sep 1936 | Box 148 \ 5 scan0118 | |
| Timeline and costs of the Phantom III chassis development, refuting claims from a previous communication. | 9th Sep 1936 | Box 148 \ 5 scan0119 | |
| The Experimental Department's responsibility for the premature sale of a chassis. | 1st Sep 1936 | Box 148 \ 5 scan0120 | |
| Delays and disputes regarding the Phantom III chassis development and readiness for public sale, comparing progress with competitors. | 4th Sep 1936 | Box 148 \ 5 scan0121 | |
| Critique of development timelines and methods, advocating for a more structured and realistic approach to new car features. | 4th Sep 1936 | Box 148 \ 5 scan0122 | |
| Chassis costs, suggesting an in-person discussion rather than continued correspondence. | 10th Sep 1936 | Box 148 \ 5 scan0123 | |
| Request for a document to assist with Phantom III cost reductions. | 1st Oct 1936 | Box 148 \ 5 scan0124 | |
| The factory costs of aluminium sand and die castings for the Bentley 4 1/4 litre and Phantom III chassis. | 5th Oct 1936 | Box 148 \ 5 scan0125 | |
| Cost comparison of brake system components between the Phantom II and Phantom III models. | 5th Oct 1936 | Box 148 \ 5 scan0126 | |
| Requesting copies of a previous memo and its reply concerning future engine design. | 11th Nov 1936 | Box 148 \ 5 scan0127 | |
| Cover memo regarding future car engine design, attaching related correspondence. | 16th Nov 1936 | Box 148 \ 5 scan0128 | |
| Future engine policy for the Wraith, considering costs, engine types, and the use of aluminium. | 16th Nov 1936 | Box 148 \ 5 scan0129 | |
| Comparison of allowed versus actual production times for various chassis models across different departments. | 21th Dec 1936 | Box 148 \ 5 scan0130 | |
| Continuation page clarifying the scope of machining and fitting times. | 21th Dec 1936 | Box 148 \ 5 scan0131 | |
| Parts list with material and labour costs for saloon valves, noted as also applicable to Bentley models. | 21th Dec 1936 | Box 148 \ 5 scan0132 | |
| List of required costs for parts on Phantom II, 25/30 HP, and Wraith models. | 24th Dec 1936 | Box 148 \ 5 scan0133 | |
| List of modifications to reduce the production cost of the Wraith model. | 24th Dec 1936 | Box 148 \ 5 scan0134 | |
| Secret internal memo requesting the comparative costs of 25/30 and Wraith petrol tanks. | 14th Jan 1937 | Box 148 \ 5 scan0135 | |
| Modifications to the Wraith II hand brake mechanism to reduce cost. | 18th Jan 1937 | Box 148 \ 5 scan0136 | |
| Request for comparative pricing on tyres, wheels, wheel nuts and wheel spanner for the 25/30 and Wraith models. | 20th Jan 1937 | Box 148 \ 5 scan0137 | |
| Message arranging a visit to Ford Motor Co. to get particulars on a Halls Planetary milling machine. | 26th Jan 1937 | Box 148 \ 5 scan0138 | |
| Estimated cost of the Wraith steering gear assembly. | 29th Jan 1937 | Box 148 \ 5 scan0139 | |
| Cost-saving economies on the Wraith Cooling Section. | 30th Jan 1937 | Box 148 \ 5 scan0140 | |
| Cost-saving change to delete machine grinding for Ph.III rear springs. | 6th Feb 1937 | Box 148 \ 5 scan0141 | |
| Investigating cost savings by whitemetalling the rockers on a Bentley chassis, with a handwritten note approving testing. | 1st Feb 1937 | Box 148 \ 5 scan0142 | |
| Modifications and estimated cost savings for the 25/30HP and Bentley Chassis Fan. | 1st Feb 1937 | Box 148 \ 5 scan0143 | |
| Cost estimate for parts required for the introduction of a thermostatic by-pass water control on a Bentley Chassis. | 12th Feb 1937 | Box 148 \ 5 scan0144 | |
| Secret memorandum detailing cost-reduction modifications to the pedals for the Wraith III model. | 3rd Mar 1937 | Box 148 \ 5 scan0145 | |
| Request for the relative costs of two different fan designs to proceed with the cheaper scheme. | 11th Mar 1937 | Box 148 \ 5 scan0146 | |
| Recommending the standardisation of the Bentley top water connection to match the 25/30 and Phantom III models for cost savings. | 12th Mar 1937 | Box 148 \ 5 scan0147 | |
| Comparison of two design schemes for the Wraith Chassis Fan, detailing material differences and cost savings. | 11th Mar 1937 | Box 148 \ 5 scan0148 | |
| The design and cost reduction of a one-piece starting handle for the Wraith III model. | 13th Mar 1937 | Box 148 \ 5 scan0149 | |
| Proposal to make the hub caps for Bentley and Wraith cars interchangeable for cost-saving. | 19th Mar 1937 | Box 148 \ 5 scan0150 | |
| Cost comparison for Wraith II and Packard mock-up front spring suspension. | 1st Apr 1937 | Box 148 \ 5 scan0151 | |
| Reluctance to delete monograms on Bentley and Wraith hub caps for cost-saving purposes. | 1st Apr 1937 | Box 148 \ 5 scan0152 | |
| Arguing against removing the company's name or monogram from hub caps for reasons of cost. | 2nd Apr 1937 | Box 148 \ 5 scan0153 | |
| Questioning the unexpected cost increase for the Bentley Improved Axle Control part, RR.Sch.966. | 31th Dec 1936 | Box 148 \ 5 scan0154 | |
| List of suggested cost-saving alterations for the Wraith III Damper Governor Control Unit. | 23th Mar 1937 | Box 148 \ 5 scan0155 | |
| Modifications to a Disc and a Plug, including changes to dimensions and materials. | 26th Apr 1937 | Box 148 \ 5 scan0156 | |
| Requesting the cost difference for standardising part LeC.5318. | 26th Apr 1937 | Box 148 \ 5 scan0157 | |
| Substitution of tappet guides with cast iron for cost-saving purposes on the Phantom III engine. | 26th Apr 1937 | Box 148 \ 5 scan0158 | |
| Costs of Phantom III tappets and potential alternatives for cost reduction. | 27th Apr 1937 | Box 148 \ 5 scan0159 | |
| Cost comparison of different connecting links for the Wraith Shock Absorber and Roll Rod. | 21th May 1937 | Box 148 \ 5 scan0160 | |
| Decision to delete the designed pressure filter for the Wraith model and consider an American bye-pass filter instead. | 21th May 1937 | Box 148 \ 5 scan0161 | |
| Request for a cost-saving comparison between two designs for the Wraith rear cross-member. | 24th May 1937 | Box 148 \ 5 scan0162 | |
| Visit to the Qualcast Limited foundry, detailing their moulding and production processes. | 31th May 1937 | Box 148 \ 5 scan0163 | |
| Foundry practices, detailing core making, moulding techniques, and supplier interactions. | 31th May 1937 | Box 148 \ 5 scan0164 | |
| Visit to Qualcast Works to observe their casting processes for high chromium iron alloy and lawn mowers, with conclusions for Rolls-Royce operations. | 31th May 1937 | Box 148 \ 5 scan0165 | |
| Sheet 4 of a report concerning foundry operations and other sections of the works. | 3rd Jun 1937 | Box 148 \ 5 scan0166 | |
| Proposal to replace a sweated disc with a spring disc in Phantom III & Bentley rear crossmembers to facilitate production and reduce costs. | 3rd Jun 1937 | Box 148 \ 5 scan0167 | |
| Request for cost figures for a Bentley water thermostat scheme and clarification on an end cover connection design. | 23th Jun 1937 | Box 148 \ 5 scan0168 | |
| Comparing hexagon and square headed bolts, concluding not to standardize on the hexagon type. | 2nd Jul 1937 | Box 148 \ 5 scan0169 | |
| Outlining a proposed new system for budgeting experimental expenditure, to be introduced on August 1st. | 5th Jul 1937 | Box 148 \ 5 scan0170 | |
| Proposal outlining a new system for costing and managing experimental development work. | 5th Jul 1937 | Box 148 \ 5 scan0171 | |
| Procedural document outlining the approval and budgeting process for major projects. | 9th Jul 1937 | Box 148 \ 5 scan0172 | |
| Cost breakdown and comparison for a Phantom III Clutch Plate Assembly. | 9th Jul 1937 | Box 148 \ 5 scan0173 | |
| Requesting cost figures for a new Bentley Thermostat Scheme and cancelling a previous request. | 10th Jul 1937 | Box 148 \ 5 scan0174 | |
| The use of square headed bolts for Bentley III and Wraith III designs. | 5th Jul 1937 | Box 148 \ 5 scan0175 | |
| Comparison memo on the manufacturing and material advantages of using hexagon bar over square bar for bolt heads. | 7th Jul 1937 | Box 148 \ 5 scan0176 | |
| Comparison of material usage and cost between Hexagon and Square bars, recommending the adoption of Hexagon bolts. | 7th Jul 1937 | Box 148 \ 5 scan0177 | |
| Comparing the machining and material considerations of hexagon versus square bolt heads. | 12th Jul 1937 | Box 148 \ 5 scan0178 | |
| Cost comparison of material for hexagon versus square headed bolts. | 8th Jul 1937 | Box 148 \ 5 scan0179 | |
| Comparative analysis of prices for brake drum castings from three different foundries. | 15th Jul 1937 | Box 148 \ 5 scan0180 | |
| Cost comparison of two schemes for the thermostatic by-pass control on a Bentley Chassis. | 3rd Aug 1937 | Box 148 \ 5 scan0181 | |
| Requesting the return of cost sheets for centralized storage in an office safe. | 5th May 1937 | Box 148 \ 5 scan0182 | |
| Internal request to order stationery and office supplies. | 6th Aug 1937 | Box 148 \ 5 scan0183 | |
| Request for cost figures for a Wraith radiator and shell assembly, to compare with a quotation from John Marston Ltd. | 13th Aug 1937 | Box 148 \ 5 scan0184 | |
| Use of different union nuts to reduce cost and prevent plating issues. | 13th Aug 1937 | Box 148 \ 5 scan0185 | |
| List of existing and suggested part numbers for union nuts on chassis water and petrol pipes. | 13th Aug 1937 | Box 148 \ 5 scan0186 | |
| Estimated factory cost breakdown for a Wraith III Radiator. | 13th Aug 1937 | Box 148 \ 5 scan0187 | |
| The procedure for requesting sets of parts for design investigation drawings. | 23th Aug 1937 | Box 148 \ 5 scan0188 | |
| Proposing a simplified reverse catch operation and a material change for the gear lever to reduce costs. | 27th Aug 1937 | Box 148 \ 5 scan0189 | |
| Blueprint detailing modifications to a reverse catch mechanism. | 25th Aug 1937 | Box 148 \ 5 scan0190 | |
| Visit to a Sheffield firm regarding the feasibility and cost of manufacturing cast steel crankshafts. | 2nd Sep 1937 | Box 148 \ 5 scan0191 | |
| The cost and practicality of producing a sample cast crankshaft. | 2nd Sep 1937 | Box 148 \ 5 scan0192 | |
| Feasibility of using cast steel crankshafts, detailing manufacturing issues and comparing them to forged crankshafts. | 3rd Sep 1937 | Box 148 \ 5 scan0193 | |
| Material choice for synchromesh cones, comparing Duralumin, Bronze, and cast iron. | 8th Sep 1937 | Box 148 \ 5 scan0194 | |
| Requesting a cost estimate for a Bentley bonnet top plate assembly. | 8th Sep 1937 | Box 148 \ 5 scan0195 | |
| Investigating the factory cost for Bentley Bonnet Top Plates. | 9th Sep 1937 | Box 148 \ 5 scan0196 | |
| Cost-saving design change for the Phantom III oil level indicator float arm. | 9th Sep 1937 | Box 148 \ 5 scan0197 | |
| Blueprint detailing a modification to an oil level indicator. | 9th Sep 1937 | Box 148 \ 5 scan0198 | |
| Cost comparisons for various starting handle schemes. | 13th Sep 1937 | Box 148 \ 5 scan0199 | |
| Request for the cost of changing a Phantom III oil cooler matrix unit. | 13th Sep 1937 | Box 148 \ 5 scan0200 | |
| Cost comparison for Synchromesh Cones made from Duralumin versus Phosphor Bronze. | 13th Sep 1937 | Box 148 \ 5 scan0201 | |
| Cancelled and rescheduled factory visits to Ford's and Leyland concerning cast crankshafts. | 14th Sep 1937 | Box 148 \ 5 scan0202 | |
| Cost comparison for 'Chromidium' Bentley brake drum castings between in-house production and Midland Cylinder Co. | 16th Sep 1937 | Box 148 \ 5 scan0203 | |
| To Mr. Robotham regarding the labour cost for millwrights requisitions. | 20th Sep 1937 | Box 148 \ 5 scan0204 | |
| Comparative cost analysis of various chassis starting handles for different car models. | 28th Sep 1937 | Box 148 \ 5 scan0205 | |
| To Mr. Robotham regarding the labour cost for completed jobs on millwrights requisitions. | 7th Oct 1937 | Box 148 \ 5 scan0206 | |
| Note discussing and comparing the costs of body mounting for various car models. | 18th Oct 1937 | Box 148 \ 5 scan0207 | |
| Request for a cost comparison for fitting strengthened axle shafts versus replacing existing ones on a Bentley rear axle. | 19th Oct 1937 | Box 148 \ 5 scan0208 | |
| The use of four-speed gearboxes with overdrive in early car models from 1905 to 1910. | 28th Oct 1937 | Box 148 \ 5 scan0209 | |
| Cost analysis and comparison for various Phantom III crankshaft stampings. | 29th Oct 1936 | Box 148 \ 5 scan0210 | |
| Cost comparison memorandum for Bentley II and Bentley III front suspension levers. | 9th Nov 1937 | Box 148 \ 5 scan0211 | |
| Cost reduction for a main lever forging by altering the design and materials. | 9th Nov 1937 | Box 148 \ 5 scan0212 | |
| Standardisation sheet for a dummy shutters and thermostat scheme on M series Bentley, detailing modifications and procurement options for the thermostat bellows unit. | 11th Nov 1937 | Box 148 \ 5 scan0213 | |
| Investigation into crankshaft manufacturing, forging costs, design difficulties, and potential improvements. | 12th Nov 1937 | Box 148 \ 5 scan0214 | |
| Crankshaft forging, machining costs, and design considerations for the Phantom III engine. | 12th Nov 1937 | Box 148 \ 5 scan0215 | |
| Crankshaft forging, materials, and the 'Tocco' hardening process. | 12th Nov 1937 | Box 148 \ 5 scan0216 | |
| The 'Tocco' crankshaft hardening process, including material tests, cost analysis, and implementation timelines. | 12th Nov 1937 | Box 148 \ 5 scan0217 | |
| | | | |
