| Description | Date | Identifier | |
| The P. 2. diamond engine mounting, mentioning delays and an attached blueprint. | 23th May 1931 | West Wittering \ V \ March1931-September1931 Scan217 | |
| Request for a time estimate to produce a new camshaft with higher lift cams for the P. 2. engine. | 23th May 1931 | West Wittering \ V \ March1931-September1931 Scan218 | |
| Potential design issues with the Bentley 4 Litre model and predicting customer dissatisfaction. | 27th May 1931 | West Wittering \ V \ March1931-September1931 Scan219 | |
| The causes of flywheel flutter and potential design solutions to minimise car vibration. | 27th May 1931 | West Wittering \ V \ March1931-September1931 Scan220 | |
| Corrections and preferences for back axle ratios on 40/50 and 25HP models. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan221 | |
| High speed engine experiments, carburettor design, and vibration reduction. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan222 | |
| Vehicle improvements, including engine smoothness, power, steering, and exhaust issues. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan223 | |
| Design considerations for a 25HP engine, focusing on head design and carburettor options. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan224 | |
| Confirming agreement on using simpler, less costly Dunlop road wheels for the future 25HP model. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan225 | |
| Material selection, quality, and cost reduction for future 25HP back axle tubes. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan226 | |
| Design of a future 25HP synchro mesh gearbox and comparing it with Buick's approach. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan227 | |
| Conversion of a 45HP Double Top gearbox to an electrically controlled friction type. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan228 | |
| Properties and damping of a 45HP conversion mounting. | 28th May 1931 | West Wittering \ V \ March1931-September1931 Scan229 | |
| Modifications and testing procedures for the P.2 10,000 miles trial. | 30th May 1931 | West Wittering \ V \ March1931-September1931 Scan230 | |
| Balance weight experiment for a crankshaft and modifications to the brake system to reduce squeaks. | 30th May 1931 | West Wittering \ V \ March1931-September1931 Scan231 | |
| Rear axle ratios, the design of hypoid gears, and a 13/50 ratio for the 25HP model. | 30th May 1931 | West Wittering \ V \ March1931-September1931 Scan232 | |
| The 'P. 2. Diamond Engine Mounting' drawings and related components. | 30th May 1931 | West Wittering \ V \ March1931-September1931 Scan233 | |
| Scheme for a starting handle shaft for the P. 2. Diamond engine mounting. | 1st Jun 1931 | West Wittering \ V \ March1931-September1931 Scan234 | |
| Water pipe drain tap for the P.2 Diamond Engine Mounting. | 1st Jun 1931 | West Wittering \ V \ March1931-September1931 Scan235 | |
| Brief memo confirming receipt of the correct parts for a damper. | 2nd Jun 1931 | West Wittering \ V \ March1931-September1931 Scan236 | |
| Horsepower required for the P.2 model to achieve 100 MPH, based on an existing graph and Bentley performance data. | 2nd Jun 1931 | West Wittering \ V \ March1931-September1931 Scan237 | |
| Graph of Road Wheel Horse Power vs. Road Speed for a Phantom II to achieve 100 MPH, with comparisons to Bentley models. | 20th May 1931 | West Wittering \ V \ March1931-September1931 Scan238 | |
| Testing and adjustments for car dynamos with series winding. | 4th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan239 | |
| Request to create a model of three varieties of tappet adjusting screws for inspection. | 4th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan240 | |
| Modifications to the 25HP Japan 1 Starting Handle Shaft. | 4th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan241 | |
| Issues with R. engine cam forms and comparing camshaft designs for car work. | 5th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan242 | |
| Increased cost of the WW scheme for Phantom II and 25HP exhaust tail pipes due to a hinged support. | 5th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan243 | |
| Petrol pump lubrication, the use of a fibre washer, and the rigidity of a cross control tube. | 5th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan244 | |
| Camshaft design, compression ratios, and fuel choices to achieve high power from an engine. | 5th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan245 | |
| Requesting the reason for a design change in shock damper pistons. | 5th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan246 | |
| Design and testing requirements for a J. 1. exhaust and silencing system. | 5th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan247 | |
| Unsatisfactory vibrations and the results of trials with torque reaction dampers. | 8th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan248 | |
| Design compromises of the Continental Touring Saloon, particularly regarding spare wheel placement and luggage capacity. | 9th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan249 | |
| The practical limitations of cam and valve design, prioritizing the 12-cylinder engine project over high-performance features. | 9th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan250 | |
| Requesting the preparation of valve lift curves for longer duration, higher lift cams. | 10th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan251 | |
| Bonnet side panel clearances for 40/50 & 25HP models to prevent knocking. | 11th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan252 | |
| Shell-Mex's request to re-test their 'Aero Shell' oil for inclusion on the recommended oils list. | 11th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan253 | |
| Costs and benefits of different radiator tube designs and bonnet ventilation. | 12th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan254 | |
| Proposed engine modifications for 'The Japan Cars', focusing on the induction system, flywheel, and crankchamber design. | 12th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan255 | |
| The development of synchro-mesh and double top gearboxes, and a proposal for a simpler 2-speed design. | 12th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan256 | |
| Application of a 20/25 flywheel tail bearing to a standard 25HP unit. | 13th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan257 | |
| Modifications to the 20/25 fan drive to suit a deeper radiator. | 13th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan258 | |
| Progress and manufacturing options for rivetless car bonnets. | 13th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan259 | |
| Schemes for a synchro-mesh gearbox and its potential fitment to a 20/25 model. | 15th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan260 | |
| Noisy self-adjusting tappets due to oil loss at high speed, proposing a design modification. | 16th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan261 | |
| From 'R.' discussing the development and selection of smaller car models, including the J. 3. and Peregrine. | 18th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan262 | |
| Comparison list of technical specifications and prices for British cars with a 16 to 18HP rating. | 18th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan263 | |
| List of foreign cars with a 16 to 18 HP rating, showing their specifications and price. | 18th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan264 | |
| Crankshaft balance weights for a car intended for a 10,000-mile test. | 18th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan265 | |
| Design and material considerations for rivetless car bonnets, comparing steel and aluminum options. | 18th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan266 | |
| The experimental drilling of a hole in the 1st motion shaft to lubricate the 20/25 flywheel tail bearing. | 19th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan267 | |
| Road springs, stress ranges, and deferring to the spring makers' expertise. | 20th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan268 | |
| Standardization and modification of drop-sided bonnets for cars with side-mounted spare wheels. | 20th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan269 | |
| Slight alteration to a synchro-mesh gearbox and existing servo gear. | 20th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan270 | |
| Design options for a new type 4 luggage grid, specifically concerning strap guides and handles. | 23th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan271 | |
| Schemes for a J.4. Gearbox servo shaft, speedometer drive, and change gear pendulum lever. | 23th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan272 | |
| Proposed rivetless aluminium bonnet design to replace a steel one. | 23th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan273 | |
| Fitting and experimental application of driver-controlled hydraulic shock dampers. | 24th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan274 | |
| Feel and movement of the J.4 Synchro Mesh Gearbox lever, seeking comparative data from the Buick. | 24th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan275 | |
| Car performance tests conducted at Brooklands, comparing a Buick with in-house models. | 24th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan276 | |
| Investigation into dynamo problems and proposed experimental solutions. | 24th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan277 | |
| Technical discussion on the wiring of headlamps and dynamos, proposing a simpler and more constant charging scheme. | 24th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan278 | |
| Pros and cons of various engine configurations and future design directions using aluminium. | 24th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan279 | |
| Material choice for engine design, comparing cast iron, aluminum, and Austenitic liners. | 25th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan280 | |
| Describing the function of the Diamond engine's rear mounting feet. | 25th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan281 | |
| Design, operation, and construction of bonnet shutters for the P.2 model. | 26th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan282 | |
| The methods for steadying the side wheel carrier with a diamond engine mounting. | 26th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan283 | |
| Reallocation of a carburetter design to the J. 3. model, detailing its manufacture and next steps. | 29th Jun 1931 | West Wittering \ V \ March1931-September1931 Scan284 | |
| Process and specific listed features for improving the modern appearance of cars, referencing the 20/25 model. | 1st Jul 1931 | West Wittering \ V \ March1931-September1931 Scan285 | |
| Comparing two front apron designs, highlighting a drawback in the Derby proposal that complicates wiring access. | 1st Jul 1931 | West Wittering \ V \ March1931-September1931 Scan286 | |
| Proposal and objections to building an experimental Special Touring Saloon. | 1st Jul 1931 | West Wittering \ V \ March1931-September1931 Scan287 | |
| 20/25 Diamond Engine Mounting and a proposed new method for steadying the side spare wheel carrier. | 2nd Jul 1931 | West Wittering \ V \ March1931-September1931 Scan288 | |
| Two alternative methods for finishing the edges of bonnet shutters. | 2nd Jul 1931 | West Wittering \ V \ March1931-September1931 Scan289 | |
| Inquiry regarding the maximum pressure a gear pump can supply for gearbox oil. | 3rd Jul 1931 | West Wittering \ V \ March1931-September1931 Scan290 | |
| Gearbox modification incorporating a delay action cam surface on the synchro mesh mechanism, similar to a Buick design. | 2nd Jul 1931 | West Wittering \ V \ March1931-September1931 Scan291 | |
| Proposed triangulation layout to stiffen the P.2 R.H. side spare wheel carrier. | 3rd Jul 1931 | West Wittering \ V \ March1931-September1931 Scan292 | |
| Experimental crankshaft with larger diameter journals to increase torsional rigidity. | 3rd Jul 1931 | West Wittering \ V \ March1931-September1931 Scan293 | |
| Modification schemes for an epicyclic 3rd speed gearbox, replacing Maybach dogs with a friction clutch. | 4th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan294 | |
| Design and material challenges of a rivetless bonnet hinge, comparing it to an Armstrong-Siddeley scheme. | 4th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan295 | |
| Sending additional schemes and information for the J.4. gearbox. | 4th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan296 | |
| Design and testing of deeper frames for car models P.2 and Japan 4. | 4th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan297 | |
| Listing several J. 3. drawings being sent for reference related to alternative designs. | 6th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan298 | |
| Design of future 6-cylinder car engines, including materials, insulation, and transmission options. | 6th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan299 | |
| Suggested Continental Touring Saloon body, scheme 3305, for the inspection of Mr. Vanderbilt Jr. | 6th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan300 | |
| Design and material of aluminium bonnets, specifically the louvred type. | 7th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan301 | |
| Sending blueprint LeC. 2926 for the revised J. 3 engine, outlining its design with an austenitic cast liner and authorising detailing work. | 7th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan302 | |
| Alternative bonnet designs, comparing steel and aluminium materials and rivetless hinge options. | 8th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan303 | |
| Proposal for a rivet-less steel bonnet, showing cross-sections of the top and side hinges. | 8th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan304 | |
| Confidential memorandum discussing a proposed car programme, including engine and chassis specifications. | 8th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan305 | |
| Decisions on ignition, fuel supply, and gearbox specifications, with references to 'China' and 'J. 2.' projects. | 8th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan306 | |
| Twin carburetter configurations and designs for the Phantom model intended for Japan. | 8th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan307 | |
| The revision of the epicyclic 3rd speed gearbox, friction clutch, and brake. | 9th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan308 | |
| Modifications to the Japan 4 gearbox clutch pit casting. | 10th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan309 | |
| Outlining five suggestions for producing and testing deeper frame side members. | 13th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan310 | |
| The design and production of an experimental induction pipe for induction research. | 11th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan311 | |
| Different carburetter arrangements for a 6-cylinder car engine, comparing single versus dual setups. | 13th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan312 | |
| Assembly method and schematic discrepancies for the J. 4. gearbox. | 13th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan313 | |
| Agreeing to a bonnet design and instructing that coachbuilders can cut it to suit the body and wings. | 13th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan314 | |
| New schedule for a gearbox filling plug, level stick, and modifications to the cover. | 14th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan315 | |
| Standardisation of adjustable clutch pedals for the Synchro Mesh Gearbox on the 25HP model. | 15th Jul 1931 | West Wittering \ V \ March1931-September1931 Scan316 | |
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