| Description | Date | Identifier | |
| Proposed modifications to the front axle for cost reduction and simplification. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan266 | |
| Design review and commentary on the 'Japan 3' petrol tank. | 29th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan267 | |
| Revised gearbox drawing, incorporating Maybach jaws and comparing it to a Chrysler design. | 31th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan268 | |
| The 'Japan 3' project detailing suggested modifications for the rear axle and brakes. | 31th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan269 | |
| Proposed proportions for the 'Japan 3' model's bonnet, radiator and dashboard, based on criticisms of the 18-G-4 model. | 31th Jan 1931 | West Wittering \ V \ October1930-February1931 Scan270 | |
| Use of single versus double carburetters for 6-cylinder car engines. | 16th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan271 | |
| Crankshaft torsional vibrations, the low inertia slipper wheel, and engine performance concerns. | 1st Feb 1931 | West Wittering \ V \ October1930-February1931 Scan272 | |
| Phantom II exhaust heated induction system and a related silencer design. | 1st Feb 1930 | West Wittering \ V \ October1930-February1931 Scan273 | |
| Increasing weight of car bodies beyond set limits and proposing stricter inspection during the construction process. | 2nd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan274 | |
| Tabulated list of vehicle weights for experimental and production cars, detailing chassis and body weights. | 2nd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan275 | |
| Arguing against removing the frame tie-bars on the 'Japan 3' model due to structural integrity concerns. | 2nd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan276 | |
| Proposal to make modified, narrower side levers standard on the 20/25 chassis. | 2nd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan277 | |
| The engine and performance characteristics of a Litre Bentley. | 3rd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan278 | |
| Flywheel vibration issues on the Japan 3 engine and proposing potential solutions. | 3rd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan279 | |
| Cost of the 25HP anchorage and proposing a new forged design for the rear anchorage of front springs. | 3rd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan280 | |
| Secret memo detailing modifications for the Japan Rear Axle, specifically concerning the hypoid axle centre case and bearing adjustments. | 2nd Mar 1931 | West Wittering \ V \ October1930-February1931 Scan281 | |
| With suggestions for the improvement of the Japan 3 gearbox design. | 3rd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan282 | |
| Suggesting design simplifications for a rear spring front anchorage. | 3rd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan283 | |
| Gear lever length and spring modifications required for a Chrysler gearbox in a right-hand drive chassis. | 3rd Feb 1931 | West Wittering \ V \ October1930-February1931 Scan284 | |
| Performance of a Chrysler gearbox with Maybach jaws as an alternative to a new design. | 4th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan285 | |
| Secret memo outlining modifications for the 'Japan 3' engine, concerning the connecting rod bolts and cylinder head design. | 4th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan286 | |
| Proposed design changes for various engine components, including tappets, crankshaft, and connecting rod nuts. | 4th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan287 | |
| Design changes and sketches for valve gear pedestals and end cylinder studs. | 4th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan288 | |
| Design, weight, and features of a new Special Touring Saloon body. | 4th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan289 | |
| Secret memo proposing an unfinished scheme for a JAP.A3 gearbox and its actuating mechanism. | 4th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan290 | |
| On an example of double battery ignition for the Stutz 8 cylinder engine. | 5th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan291 | |
| New battery arrangement to create space for new shock dampers. | 5th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan292 | |
| The rear axle and brakes for the 'JAPAN 3' model, including scheme references and design considerations. | 5th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan293 | |
| Secret memo discussing design modifications to the 'Japan 3' engine, focusing on connecting rod length, flywheel, and clutch assembly. | 2nd May 1931 | West Wittering \ V \ October1930-February1931 Scan294 | |
| Design considerations for cylinder end studs, valve rocker cover, and sparking plug holes. | 2nd May 1931 | West Wittering \ V \ October1930-February1931 Scan295 | |
| The progress and procedure for converting crankcases to a new 'Diamond Mounting' system. | 2nd May 1931 | West Wittering \ V \ October1930-February1931 Scan296 | |
| Design modifications and production considerations for the Japan 3 petrol tank. | 5th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan297 | |
| Arrangement and sourcing of dashboard controls and instruments for a chassis, including suggestions for suppliers. | 6th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan298 | |
| Layout of controls and instruments for the 'Japan 3' project, with reference to a Humber chassis. | 6th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan299 | |
| The policy and technical approach for supplying rear aprons for the P.2 model with a revised luggage grid. | 6th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan300 | |
| Secret memorandum with a sketch discussing the design and production of a cast dashboard for the Japan III model. | 6th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan301 | |
| Flywheel vibrations, crankshaft deflection, and potential engineering solutions to improve engine performance. | 6th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan302 | |
| Engine improvements, focusing on pins, webs, balance weights, and crankshaft vibration. | 6th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan303 | |
| Engineering merits of a 12-cylinder engine, focusing on vibration, crankshaft design, and performance. | 2nd Jul 1931 | West Wittering \ V \ October1930-February1931 Scan304 | |
| Steering and control configurations for various chassis types and markets. | 2nd Jul 1931 | West Wittering \ V \ October1930-February1931 Scan305 | |
| Suggesting the acquisition and testing of a Lucas 3rd brush dynamo for comparison against their own model. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan306 | |
| Design of hydraulic dampers and front axle control. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan307 | |
| Design, placement, and patent considerations for dampers and relief valves. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan308 | |
| Secret memo regarding modifications to the Japan 3 project's hypoid rear axle. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan309 | |
| Use of rubber hoses versus pipe schemes for centralised chassis lubrication. | 1st Feb 1931 | West Wittering \ V \ October1930-February1931 Scan310 | |
| The fitting of Delco hydraulic shock dampers to the L.H. American chassis. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan311 | |
| Engine design challenges for the Japan 3 engine, covering flywheel fixing, flexibility, and valve types. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan312 | |
| Request for information from Messrs Luvax regarding centralised chassis lubrication methods. | 2nd Mar 1931 | West Wittering \ V \ October1930-February1931 Scan313 | |
| Secret memo regarding schemes for the Japan 3 gearbox and forthcoming modifications. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan314 | |
| Blueprint and assembly of a diamond suspension for a power unit. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan315 | |
| Secret memo regarding modifications to a drawing, including crankcase and con. rod dimensions. | 1st Feb 1931 | West Wittering \ V \ October1930-February1931 Scan316 | |
| The issue of the connecting rod big end no longer passing through the cylinder bore due to a crankpin diameter increase. | 7th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan317 | |
| Pros and cons of using subframes on car bodies, referencing PII and 20/25HP models. | 5th Mar 1931 | West Wittering \ V \ October1930-February1931 Scan318 | |
| Secret memo regarding the JAP. J. valve rocker gear and cylinder head, circulating drawing LeC. 2864 for comments. | 9th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan319 | |
| Technical memo detailing the design of the valve rocker gear and cylinder head for the 'Japan 3' engine. | 9th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan320 | |
| Design changes to cylinder block casting, specifically concerning boss features and inspection holes. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan321 | |
| Design principles and challenges of shock dampers. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan322 | |
| Technical discussion on valve design, shock dampers, and other chassis components. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan323 | |
| Design options for an engine front support, including diagrams. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan324 | |
| Proposal to increase the thickness of the crankshaft flange and flywheel web to improve stiffness. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan325 | |
| Design schemes for a special touring saloon body on the 20/25 chassis. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan326 | |
| Communication regarding a revision to the lock nut adjustment for the crown wheel, referencing N. schemes 3206 and 3219. | 10th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan327 | |
| Body specifications for the 'Japan 3' chassis and the use of experimental cars. | 11th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan328 | |
| Dynamo output, comparing a Lucas machine to an in-house model and suggesting improvements. | 11th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan329 | |
| Proposal to replace a special 'Paxon' air bag rear cushion with a spring cushion on an experimental car. | 11th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan330 | |
| The non-arrival of a scheme for the Humfrey-Sandberg clutch. | 11th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan331 | |
| Secret memo discussing revisions for the Japan 3 Gearbox, detailing alternative proposals for mounting the reverse wheel. | 12th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan332 | |
| Operation of the main reserve fuel system from the dash instead of the main tank. | 12th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan333 | |
| Suggested letter to Mr. Pye regarding compression ignition engine development and research. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan334 | |
| Engine design ideas, including injection timing, pumps, and a proposed two-stroke cycle. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan335 | |
| Brief memo regarding the despatch of a Chrysler gearbox by train. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan336 | |
| Optimal placement of toolboxes in a car for weight distribution and accessibility. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan337 | |
| Design scheme for a front suspension with diamond mounting. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan338 | |
| Modifications to the front anchorage of the rear springs and its oiling system. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan339 | |
| Design and materials for the 'Japan 3' brake differentials, referencing scheme 3215. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan340 | |
| Schemes for a side lever mechanism for the epicyclic 3rd speed gearbox. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan341 | |
| The completion of an epicyclic 3rd speed gearbox and its associated controls. | 14th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan342 | |
| Two proposed modifications to the Japan 3 engine concerning the combustion chamber and crankpin. | 16th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan343 | |
| Covering note for the original document LeC. 2874 regarding balance weights. | 16th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan344 | |
| Scheme for balance weights on the Phantom engine. | 16th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan345 | |
| Design and issues of a spring-loaded piston for P. 2. and 25HP shock dampers. | 16th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan346 | |
| Design for a spring-loaded piston for rear dampers. | 18th Jul 1931 | West Wittering \ V \ October1930-February1931 Scan347 | |
| Analysing the sources of engine vibrations and body resonance, focusing on torsional variations and compression ratios. | 23th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan348 | |
| Engine vibration, mounting systems, and methods for reducing torsional vibrations. | 23th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan349 | |
| Analysis of engine vibrations, focusing on torsional periods, flywheel whirl, and potential improvements. | 23th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan350 | |
| Engine vibration issues such as torque reaction, over-run, and flywheel whirl, and proposing potential solutions. | 23th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan351 | |
| Engine choices, chassis stiffness, vibration, and body construction, including a diagram of frame stiffening. | 23th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan352 | |
| Torque reaction, torque arm placement and flywheel whirl, with a comparison to Bentley. | 17th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan353 | |
| Car weights, the reliability of data, and the role of coachbuilders in influencing total vehicle weight. | 17th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan354 | |
| Competitor accessories from Barker's and the need to gather comparative weight data for various cars. | 18th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan355 | |
| New spring-loaded piston for shock dampers and inquiring about production status. | 18th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan356 | |
| Design assumptions, material proposals, and questions regarding car bonnets. | 19th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan357 | |
| Design and mock-up of the bonnet, radiator, and dash for the 'Japan 3' model. | 19th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan358 | |
| Various control schemes and alternatives for an epicyclic 3rd speed gearbox. | 19th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan359 | |
| Modifications and criticisms of a hydraulic damper design. | 20th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan360 | |
| Design of an axle system, focusing on hydraulic pressure, glands, lubrication, and component fitting. | 24th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan361 | |
| Investigation of vibrations in Phantom cars, their periodicity, and methods for testing. | 24th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan362 | |
| Typed memo discussing engine design choices and issues, comparing Phantom I and P.2 models, focusing on flywheel and crankshaft dynamics. | 20th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan363 | |
| Observations on the difficulties and potential remedies for a Maybach dog clutch gearbox, with diagrams. | 20th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan364 | |
| Gearbox design considerations including transmission flexibility, clutch operation, and gear selection safety for the Phantom model. | 23th Feb 1931 | West Wittering \ V \ October1930-February1931 Scan365 | |
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