| Description | Date | Identifier | |
| Cost analysis comparing different crankshaft forging and material specifications for the Phantom III and Wraith models. | 13th Nov 1937 | Box 148 \ 5 scan0218 | |
| Proposal for a modified radiator filler for the Wraith model, requesting a cost comparison. | 13th Nov 1937 | Box 148 \ 5 scan0219 | |
| Proposal to test new American 'Thermoid' brake linings on the Wraith model to resolve squeaking issues. | 15th Nov 1937 | Box 148 \ 5 scan0220 | |
| Proposed specification for the 39-EX Continental P.III, outlining cost reduction and reliability improvements. | 15th Nov 1937 | Box 148 \ 5 scan0221 | |
| List of proposed improvements for a 'Better Car' and general engineering points. | 15th Nov 1937 | Box 148 \ 5 scan0222 | |
| The potential cost reduction of a Bentley crankshaft by introducing a Packard type. | 16th Nov 1937 | Box 148 \ 5 scan0223 | |
| Cost comparison of electrical components for existing, new, and outside contractor designs. | 22th Nov 1937 | Box 148 \ 5 scan0224 | |
| List of components and their specifications for a new design. | 19th Nov 1937 | Box 148 \ 5 scan0225 | |
| Request for the increased cost of fitting a steam valve scheme to a Wraith radiator. | 23th Nov 1937 | Box 148 \ 5 scan0226 | |
| Cost comparison and quality assessment for manufacturing vs purchasing Fixed Radiator Shutters for the Bentley 'M' series. | 24th Nov 1937 | Box 148 \ 5 scan0227 | |
| Cost investigation memo for a Radiator Steam Valve modification on the Wraith Chassis. | 25th Nov 1937 | Box 148 \ 5 scan0228 | |
| Cost comparison for a modified radiator filler cap for the Wraith Chassis. | 13th Nov 1937 | Box 148 \ 5 scan0229 | |
| Brief history comparing the Bentley B.III and Bentley B.50 (original Phoenix) projects. | 25th Nov 1937 | Box 148 \ 5 scan0230 | |
| Comparison of specifications for projects B.III and B.50, detailing potential modifications for a new model. | 25th Nov 1937 | Box 148 \ 5 scan0231 | |
| Design proposals for Project No.4 and Project No.5, detailing chassis and body specifications for models B.III and B.50. | 25th Nov 1937 | Box 148 \ 5 scan0232 | |
| Comparison of chassis and body specifications for the B.III and B.50 models. | 25th Nov 1937 | Box 148 \ 5 scan0233 | |
| Potential cost reduction for the Bentley III dashboard by switching from a cast version to a pressed steel one. | 26th Nov 1937 | Box 148 \ 5 scan0234 | |
| Request for Park Wards to make two sets of loose seat covers for the Bentley III, Wraith, and all future experimental cars. | 1st Dec 1937 | Box 148 \ 5 scan0235 | |
| Cost implications of machining a Packard type crankshaft for a Bentley chassis. | 1st Dec 1937 | Box 148 \ 5 scan0236 | |
| Request for the cost of Wraith petrol tank filler and hanging parts to estimate for a similar Bentley III tank. | 4th Dec 1937 | Box 148 \ 5 scan0237 | |
| Parts list with corresponding reference numbers. | 4th Dec 1937 | Box 148 \ 5 scan0238 | |
| Parts list for the Wraith III petrol tank, stone guard, tank hanging, and petrol filler. | 4th Dec 1937 | Box 148 \ 5 scan0239 | |
| Modifications, costs, and design changes for Bentley III brake components. | 8th Dec 1937 | Box 148 \ 5 scan0240 | |
| Comparative cost analysis table for Thermoid and Ferodo products. | 10th Dec 1937 | Box 148 \ 5 scan0241 | |
| Prices for driven plates and clutches from Borg & Beck. | 10th Dec 1937 | Box 148 \ 5 scan0242 | |
| Cost of rectifying roller failures by scrapping inner races versus upgrading to a Wraith follower. | 11th Dec 1937 | Box 148 \ 5 scan0243 | |
| Investigation report on the failures of Phantom III steering rollers, listing specific chassis, mileages, and conclusions for each case. | 11th Dec 1937 | Box 148 \ 5 scan0244 | |
| Component failures related to roller bearings, discussing insufficient case hardening and recommending manufacturing and design improvements. | 11th Dec 1937 | Box 148 \ 5 scan0245 | |
| Strategy for quantity production of car bodies for the Bentley 50 project. | 13th Dec 1937 | Box 148 \ 5 scan0246 | |
| The future of in-house body and chassis production and the personnel requirements. | 13th Dec 1937 | Box 148 \ 5 scan0247 | |
| Specifications, styling, and production of the B.50 car body, including costs and manufacturing methods. | 13th Dec 1937 | Box 148 \ 5 scan0248 | |
| The strategy and timeline for initiating in-house body production, with specific reference to Bentley models. | 13th Dec 1937 | Box 148 \ 5 scan0249 | |
| Lack of a definite target for body work and the split responsibility between different locations. | 13th Dec 1937 | Box 148 \ 5 scan0250 | |
| Price list and breakdown for various S.U. petrol pumps, including high-pressure and Bentley models. | 14th Dec 1937 | Box 148 \ 5 scan0251 | |
| Price list and breakdown for various types of S.U. petrol pumps, including variations for Bentley models. | 14th Dec 1937 | Box 148 \ 5 scan0252 | |
| Pricing information for Avon Duo Tread tyres, covers, and tubes, including retail, trade and discount details. | 14th Dec 1937 | Box 148 \ 5 scan0253 | |
| Price list detailing costs for various S.U. petrol pumps and their components. | 14th Dec 1937 | Box 148 \ 5 scan0254 | |
| Economics of in-house development versus buying out parts, specifically concerning Armstrong Dampers. | 14th Dec 1937 | Box 148 \ 5 scan0255 | |
| Sourcing and ordering of Thermoid brake linings for Bentley and Wraith models. | 15th Dec 1937 | Box 148 \ 5 scan0256 | |
| Cover note regarding the prices of alloy steels. | 22th Dec 1937 | Box 148 \ 5 scan0257 | |
| Comparing the prices of alloy steels from various suppliers. | 21th Dec 1937 | Box 148 \ 5 scan0258 | |
| Comparing steel prices, quality, and rejection rates from various suppliers like Firths and the Alloy Steel Association. | 21th Dec 1937 | Box 148 \ 5 scan0259 | |
| Price comparison and analysis of steel supplied by Firths versus the Alloy Steel Association. | 21th Dec 1937 | Box 148 \ 5 scan0260 | |
| Page discussing the consequences of abandoning existing specifications, such as increased inspection and machined scrap. | 21th Dec 1937 | Box 148 \ 5 scan0261 | |
| Methods for securing studs with screw threads, particularly in metals other than aluminium. | 23th Dec 1937 | Box 148 \ 5 scan0262 | |
| Use of shouldered studs and recommending the continuation of the current practice for retaining studs. | 1st Jan 1938 | Box 148 \ 5 scan0263 | |
| Proposal regarding radiator matrices, discussing cost savings by dispensing with pressure testing. | 1st Jan 1938 | Box 148 \ 5 scan0264 | |
| Cost file document detailing the prices of various carburettors. | 4th Jan 1938 | Box 148 \ 5 scan0265 | |
| Price comparison for road springs made from different types of steel from suppliers Woodheads and Firths. | 4th Jan 1938 | Box 148 \ 5 scan0266 | |
| Cost-effectiveness of different throttle control schemes for the Bentley III engine. | 8th Jan 1938 | Box 148 \ 5 scan0267 | |
| Samples of chassis valve forgings from Belgrave Eng. Co. and requesting a cost analysis. | 10th Jan 1938 | Box 148 \ 5 scan0268 | |
| Considering two proposed headlamp systems, their costs, and improvements to the R.100 Mark 4 model. | 3rd Jan 1938 | Box 148 \ 5 scan0269 | |
| To Mr. Robotham detailing the labour cost of completed jobs on Millwrights requisitions. | 1st Jan 1938 | Box 148 \ 5 scan0270 | |
| Requesting a cost comparison for different configurations of bottom water connections for the Wraith model. | 18th Jan 1938 | Box 148 \ 5 scan0271 | |
| Chassis costs, detailing the intention to review units on the Wraith and Phantom III to eliminate unnecessary costs. | 20th Jan 1938 | Box 148 \ 5 scan0272 | |
| Cost comparison of two alternative schemes for the bottom water connection on the Wraith Chassis. | 18th Jan 1938 | Box 148 \ 5 scan0273 | |
| Cost reduction negotiations with Marstons Ltd. for 'M' series Bentley and B.III radiator dummy shutter sets. | 24th Jan 1938 | Box 148 \ 5 scan0274 | |
| Cost analysis memorandum regarding the deletion of the oil cooler on the Phantom III model. | 25th Jan 1938 | Box 148 \ 5 scan0275 | |
| Supply of dummy radiator shutters for Bentley 2 and Bentley 3 models. | 26th Jan 1938 | Box 148 \ 5 scan0276 | |
| Requesting the factory cost of Phantom III gearbox parts and noting an experimental set supplied to Leylands. | 27th Jan 1938 | Box 148 \ 5 scan0277 | |
| Request for comparative cost figures for various components of a Wraith radiator. | 28th Jan 1938 | Box 148 \ 5 scan0278 | |
| Cost analysis memorandum regarding the deletion of the oil cooler for the Phantom III. | 31th Jan 1938 | Box 148 \ 5 scan0279 | |
| Request for a full cost analysis of Phantom III and Bentley connecting rods. | 31th Jan 1938 | Box 148 \ 5 scan0280 | |
| Cost difference between two thread arrangements for the Wraith filler cap. | 2nd Feb 1938 | Box 148 \ 5 scan0281 | |
| The deletion of the Phantom III oil cooler and the adoption of aluminium tin big-ends. | 4th Feb 1938 | Box 148 \ 5 scan0282 | |
| Experimental costs, project sheet criteria, and the development of specific engine components. | 4th Feb 1938 | Box 148 \ 5 scan0283 | |
| Production modifications, experimental costs, and the scrapping or storage of experimental parts. | 4th Feb 1938 | Box 148 \ 5 scan0284 | |
| The cost of experimental work, urging co-operation to avoid waste. | 4th Feb 1938 | Box 148 \ 5 scan0285 | |
| The acquisition of a Lincoln Forked Connecting Rod for cost reduction analysis on the Phantom III model. | 4th Feb 1938 | Box 148 \ 5 scan0286 | |
| Requesting clarification on an expense for Vandervell Products bearings. | 4th Feb 1938 | Box 148 \ 5 scan0287 | |
| Cost comparison of two alternative thread arrangements for the Filler Tube and Cap on the Wraith Chassis. | 2nd Feb 1938 | Box 148 \ 5 scan0288 | |
| Request for factory cost figures for a B.III Radiator and its constituent parts for comparison purposes. | 8th Feb 1938 | Box 148 \ 5 scan0289 | |
| Parts list for a shell and shutter assembly, including component specifications and reference numbers. | 8th Feb 1938 | Box 148 \ 5 scan0290 | |
| Proposal for purchasing and assembling high-pressure S.U. petrol pump parts at Derby, outlining potential cost savings. | 3rd Mar 1938 | Box 148 \ 5 scan0291 | |
| Parts list detailing components including steel magnet pots, oil silk diaphragm assemblies, brass rollers, and springs. | 3rd Mar 1938 | Box 148 \ 5 scan0292 | |
| List of parts required to assemble an H.F. S.U. petrol pump at the works. | 3rd Mar 1938 | Box 148 \ 5 scan0293 | |
| Requesting a factory cost comparison for a revised fan mounting for the Wraith, B.III, and B.50 models. | 3rd Mar 1938 | Box 148 \ 5 scan0294 | |
| Policy discussion on chassis power plant design, comparing the B.50 unit with the Phantom III engine and other alternatives. | 5th Mar 1938 | Box 148 \ 5 scan0295 | |
| Future engine strategy, comparing the redesign of the Phantom III unit against new straight-eight and other engine configurations. | 5th Mar 1938 | Box 148 \ 5 scan0296 | |
| Development expenditure, production, and pricing strategy for a car model to compete with rivals like Vauxhall. | 5th Mar 1938 | Box 148 \ 5 scan0297 | |
| Numbered list of proposed design changes and simplifications for an engine. | 5th Mar 1938 | Box 148 \ 5 scan0298 | |
| Future brake designs, including considerations for independent suspension and hydraulic systems. | 9th Mar 1936 | Box 148 \ 5 scan0299 | |
| Technical memorandum on the development of brake systems, covering servo assistance, hand brakes, brake ratios, and component interchangeability. | 7th Mar 1938 | Box 148 \ 5 scan0300 | |
| Specifications for front brake drums, aiming for a common interchangeable design. | 7th Sep 1938 | Box 148 \ 5 scan0301 | |
| Policy of buying assemblies versus in-house manufacturing, using Hardy Spicer propeller shafts as an example. | 8th Mar 1938 | Box 148 \ 5 scan0302 | |
| Using Spicer shafts on Wraith and Phantom III models, arguing for buying specialist parts. | 8th Mar 1938 | Box 148 \ 5 scan0303 | |
| Request for an estimate of material and labour costs for combined bumper and jack brackets. | 8th Mar 1938 | Box 148 \ 5 scan0304 | |
| Cost comparison of three alternative Fan Spindle adjustment schemes for the Wraith and B.III models. | 3rd Mar 1938 | Box 148 \ 5 scan0305 | |
| Price list for Borg & Beck clutch components for various car models. | 1st Jan 1938 | Box 148 \ 5 scan0306 | |
| The factory cost for Bentley III Bumper and Jack Brackets. | 8th Mar 1938 | Box 148 \ 5 scan0307 | |
| Material change for anti-roll rods to achieve cost savings. | 14th Mar 1938 | Box 148 \ 5 scan0308 | |
| Cost comparison memo regarding the 25/30 HP and Wraith III engine suspensions. | 14th Mar 1938 | Box 148 \ 5 scan0309 | |
| The mishandling of a secret document concerning future vehicle production. | 15th Mar 1938 | Box 148 \ 5 scan0310 | |
| Cost reduction strategies for the B.III and B.50 car radiators. | 17th Mar 1938 | Box 148 \ 5 scan0311 | |
| List of modifications to be included in a scheme for a reduced cost B.III radiator. | 17th Mar 1938 | Box 148 \ 5 scan0312 | |
| Cost analysis and proposal for a new throttle control lever made from manganese bronze forging. | 25th Mar 1938 | Box 148 \ 5 scan0313 | |
| Summary of price reductions and comparisons for the Wraith front bumper from different suppliers. | 26th Mar 1938 | Box 148 \ 5 scan0314 | |
| Comparison of eye-roll bumpers from different manufacturers for car production. | 26th Mar 1938 | Box 148 \ 5 scan0315 | |
| Development and cost comparison for a new 4-shoe brake system for the Wraith. | 1st Mar 1938 | Box 148 \ 5 scan0316 | |
| Costs and reasons for experimental scrap due to design changes and drawing errors. | 8th Apr 1938 | Box 148 \ 5 scan0317 | |
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