| Description | Date | Identifier | |
| With diagrams discussing alternative designs for securing a hydraulic shock damper piston. | 14th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan117 | |
| Patent royalties for Maybach jaws, comparing costs with Ricardo and Bentley. | 14th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan118 | |
| Dissatisfaction with a 6-cylinder engine, focusing on torsional vibrations and damper design. | 14th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan119 | |
| Engine vibration, proposing a design for a centrifugal friction damper for the crankshaft. | 14th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan120 | |
| Modifications and air trapping issues in hydraulic shock dampers. | 14th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan121 | |
| Preliminary print for a double-acting valve in a revised horizontal shock damper. | 14th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan122 | |
| Blueprint of a revised horizontal shock damper with a double-acting valve. | 15th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan123 | |
| Modified damper piston and the provision for replenishing valves. | 15th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan124 | |
| Modifications and testing of an epicyclic 3rd speed gearbox. | 16th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan125 | |
| Series of proposals for economy and efficiency improvements on car components for model J. 3. | 17th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan126 | |
| Series of suggestions for design changes and cost reductions for a brake lever, petrol tank filter, autovac tank, and wiring. | 18th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan127 | |
| Future car engine design, comparing 6-cylinder, Vee-type, and Ricardo engines. | 18th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan128 | |
| Engine and chassis design, focusing on frame twist, vibration, mounting, and a review of competitor practices. | 18th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan129 | |
| Crankshaft vibration, dampers, and flywheel placement for a 6-cylinder engine. | 20th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan130 | |
| Suggesting a cheaper method for manufacturing chassis floorboards using metal-faced 'Plymax' wood. | 20th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan131 | |
| Investigation into twin choke carburetter performance, comparing present and modified designs. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan132 | |
| The fuel supply to the low speed jet and the float chamber lid joint. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan133 | |
| Comparison of engine performance and potential improvements between Rolls Royce and Bentley vehicles. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan134 | |
| Cause of chassis vibrations at specific speeds and proposing tests on crankshaft and frame flexibility. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan135 | |
| Problems with an eight-cylinder Vee engine and comparing crankshaft arrangements to Cadillac's. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan136 | |
| Comparative table of specifications for various multi-cylinder car engines. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan137 | |
| Cost and implementation of Maybach Patents for a double top system. | 21th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan138 | |
| Design considerations for a horizontal damper, including cylinder types, lever attachments, and bushes. | 22th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan139 | |
| Improvements to the Continental Phantom engine's induction system to increase power, with a comparison to the Bentley engine. | 22th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan140 | |
| Proposals for dashboards, steering columns, seating, pedals, and levers for P. 2. L. H. steerings. | 22th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan141 | |
| Delay in the design of improved exhaust manifolds for P. I. & G. I. models. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan142 | |
| Proposed method for temporarily fitting a brake to the sun gear of an epicyclic 3rd speed gearbox. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan143 | |
| Secret memo regarding the provisional approval of drawings for the 'JAPAN 3' project, listing specific components. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan144 | |
| Two design alternatives for a modified shock damper piston. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan145 | |
| Search for a theoretical mathematician for electrical work. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan146 | |
| Causes of brake squeaks and the development of pivoted and loco type brake shoes. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan147 | |
| Potential electrical 'Voisin scheme' to gain a competitive advantage over Hispano and Bentley. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan148 | |
| Experimental arrangement for a bearing behind the flywheel. | 23th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan149 | |
| Containing a copy of a telegram about arranging a conference on crankshaft torsional period. | 24th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan150 | |
| The storage of an N. scheme front axle and the need for a new drawing for a separate brake erection proposal. | 24th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan151 | |
| Suggestions to improve a vacuum-assisted gearbox mechanism based on experimental tests. | 24th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan152 | |
| Arguing against the use of cast iron crankchambers for the J.3 model due to concerns about weight, reputation, and sales. | 24th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan153 | |
| Cost-reduction proposals for ignition wiring tubes for the P. 2 model. | 25th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan154 | |
| Assumptions made for experiments on stiffening side members vertically. | 28th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan155 | |
| Design modifications and cost-saving measures for a shock damper. | 28th Apr 1931 | West Wittering \ V \ March1931-September1931 Scan156 | |
| Requesting to get a Warner synchro-mesh gearbox and to investigate the teeth on a Chrysler gearbox. | 1st May 1931 | West Wittering \ V \ March1931-September1931 Scan157 | |
| Redesign of a petrol pump to a fabric diaphragm due to cost and make-or-buy considerations. | 4th May 1931 | West Wittering \ V \ March1931-September1931 Scan158 | |
| Alterations and performance issues of double carburetters. | 4th May 1931 | West Wittering \ V \ March1931-September1931 Scan159 | |
| Design of slow running adjusting screws for twin carburetters. | 6th May 1931 | West Wittering \ V \ March1931-September1931 Scan160 | |
| Request for oil-soaked cotton linings from torque and shimmy dampers to be used in an experiment. | 6th May 1931 | West Wittering \ V \ March1931-September1931 Scan161 | |
| Approval, progress, and production considerations for a revised shock damper with a double-acting valve. | 6th May 1931 | West Wittering \ V \ March1931-September1931 Scan162 | |
| Outlining two standard options for wheel carriers and luggage grids for the 20/25 'T' Series cars. | 6th May 1931 | West Wittering \ V \ March1931-September1931 Scan163 | |
| Proposal to incorporate cost-saving features from the J.3. tanks into the 20/25 'T' Series petrol tank. | 16th May 1931 | West Wittering \ V \ March1931-September1931 Scan164 | |
| Bonnet and side wheel carrier modifications for the 20/25 'T' Series due to coachwork commitments. | 6th May 1931 | West Wittering \ V \ March1931-September1931 Scan165 | |
| Proposed design and performance changes for the 'Japan 1' / second half 'T' series vehicle. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan166 | |
| Technical memorandum detailing standard and future options for wheel carriers and luggage grids on P.2. and 20/25 models. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan167 | |
| General remarks suggesting the optimal placement of spare wheels to enhance suspension. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan168 | |
| Design of car engine suspension and mounting to reduce vibrations. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan169 | |
| Technical memorandum discussing the pros and cons of banjo type back axles compared to existing designs. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan170 | |
| Advantages of a newly completed petrol pump design, adaptable for the 25HP model. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan171 | |
| Decision of whether to manufacture electrical units in-house or purchase them from external suppliers like Lucas, Bosch, or C.A.V. | 11th May 1931 | West Wittering \ V \ March1931-September1931 Scan172 | |
| Strategic decision between in-house manufacturing and purchasing parts from external suppliers. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan173 | |
| Investigation into a 'booming' noise, concluding it is a body or frame characteristic. | 7th May 1931 | West Wittering \ V \ March1931-September1931 Scan174 | |
| Future chassis work and specifications for the 6-cylinder P.2. and J.1. models. | 8th May 1931 | West Wittering \ V \ March1931-September1931 Scan175 | |
| Future car and aero engine development, advocating for 12-cylinder engines for luxury cars. | 8th May 1931 | West Wittering \ V \ March1931-September1931 Scan176 | |
| Recommending the creation of a universal dashboard for the 20/25 chassis 'T' series. | 8th May 1931 | West Wittering \ V \ March1931-September1931 Scan177 | |
| Proposed changes to the bonnet for the second half of the 'T' series 20/25 model. | 8th May 1931 | West Wittering \ V \ March1931-September1931 Scan178 | |
| Modifications and clarifications for an epicyclic 3rd speed gearbox. | 8th May 1931 | West Wittering \ V \ March1931-September1931 Scan179 | |
| Challenges and progress on developing rivetless bonnets, comparing steel and aluminium options. | 9th May 1931 | West Wittering \ V \ March1931-September1931 Scan180 | |
| Proposing a modification to the side levers for the 20/25 'T' Series chassis. | 9th May 1934 | West Wittering \ V \ March1931-September1931 Scan181 | |
| Revised engine suspension scheme with a dropped radiator. | 11th May 1931 | West Wittering \ V \ March1931-September1931 Scan182 | |
| Bonnet lengthening and dashboard proposals for the 'T' Series. | 11th May 1931 | West Wittering \ V \ March1931-September1931 Scan183 | |
| Proposed new design for a relay-operated starter switch. | 11th May 1931 | West Wittering \ V \ March1931-September1931 Scan184 | |
| Request for a blueprint of a 20/25 Cylinder Head (Japan 1) that was issued to the pattern shop. | 11th May 1931 | West Wittering \ V \ March1931-September1931 Scan185 | |
| Comparing the smoothness and running characteristics of an 8-litre Bentley. | 11th May 1931 | West Wittering \ V \ March1931-September1931 Scan186 | |
| Up-to-date conversion designs and novel features for hydraulic dampers. | 12th May 1931 | West Wittering \ V \ March1931-September1931 Scan187 | |
| Drawings for a modified twin carburetter and its hot spot piping. | 12th May 1931 | West Wittering \ V \ March1931-September1931 Scan188 | |
| Japan 1 radiator, detailing thermostat control, spring tensions, and numberplate placement. | 12th May 1931 | West Wittering \ V \ March1931-September1931 Scan189 | |
| Proposed universal dashboard for 'JAPAN 1', referencing schedule 3276. | 12th May 1931 | West Wittering \ V \ March1931-September1931 Scan190 | |
| Technical specifications and proposed alterations for the 25HP Japan 1 model. | 12th May 1931 | West Wittering \ V \ March1931-September1931 Scan191 | |
| Design for an exhaust system and required carburettor components, referencing the Silver Ghost model. | 13th May 1931 | West Wittering \ V \ March1931-September1931 Scan192 | |
| Confirming the despatch of a front dumb iron and discussing modifications to its dimensions and bumper pad. | 15th May 1931 | West Wittering \ V \ March1931-September1931 Scan193 | |
| Engine suspension and lower radiator, confirming no special retention apparatus is required. | 15th May 1931 | West Wittering \ V \ March1931-September1931 Scan194 | |
| The design of a universal dashboard for the second half of 'T' series 20/25 vehicles. | 16th May 1931 | West Wittering \ V \ March1931-September1931 Scan195 | |
| Engine smoothness, comparing different balance weight schemes and their effects on flywheel vibration. | 18th May 1931 | West Wittering \ V \ March1931-September1931 Scan196 | |
| Theoretical considerations and suggestions for the manufacture of road springs. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan197 | |
| Comparison between Dunlop and Rudge-Whitworth wheel systems, expressing a preference for the Dunlop system. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan198 | |
| Modified engine mounting to cure booms, using torque-carrying feet for a diamond mounting. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan199 | |
| Design and modification of a petrol pump operating mechanism. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan200 | |
| Suggested modifications to a shock damper, including a technical sketch. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan201 | |
| Modifications to 40/50 & 25HP dynamos and electrical circuits for improved performance. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan202 | |
| Material, design, and strength testing of back axle tubes. | 19th May 1931 | West Wittering \ V \ March1931-September1931 Scan203 | |
| Engine and body modifications for a 100 MPH demonstration vehicle. | 20th May 1931 | West Wittering \ V \ March1931-September1931 Scan204 | |
| Modified headlamp bracket fixings for the 20/25HP 'T' Series and proposing a standardized front apron. | 20th May 1931 | West Wittering \ V \ March1931-September1931 Scan205 | |
| Design of bumper fixings for the 20/25 HP 'T' Series. | 21th May 1931 | West Wittering \ V \ March1931-September1931 Scan206 | |
| Cancelling the request to build a wooden model of a 20/25 car as the improved appearance scheme has already been approved. | 21th May 1931 | West Wittering \ V \ March1931-September1931 Scan207 | |
| J. 1. Specification document detailing engine, flywheel, gearbox, and camshaft design. | 21th May 1931 | West Wittering \ V \ March1931-September1931 Scan208 | |
| Engine performance expectations and design notes on camshafts, axle, brakes, and cylinder head. | 21th May 1931 | West Wittering \ V \ March1931-September1931 Scan209 | |
| Updates and changes to various engine and fuel system components. | 21th May 1931 | West Wittering \ V \ March1931-September1931 Scan210 | |
| Request to obtain a starter motor from an Austin 7 or a Riley 9 for experimental adaptation to an epicyclic gear change. | 21th May 1931 | West Wittering \ V \ March1931-September1931 Scan211 | |
| Modifications and design improvements for A.C. standard petrol pumps. | 22th May 1931 | West Wittering \ V \ March1931-September1931 Scan212 | |
| Arguing for the perseverance of swivelling brake shoes due to their superior performance. | 22th May 1931 | West Wittering \ V \ March1931-September1931 Scan213 | |
| Proposal for modifying the suspension and engine of a P.2 vehicle for a 10,000-mile trial. | 22th May 1931 | West Wittering \ V \ March1931-September1931 Scan214 | |
| Solutions for engine vibration and noise, and proposing a crankshaft torsional vibration experiment. | 22th May 1931 | West Wittering \ V \ March1931-September1931 Scan215 | |
| Radiator design changes for 45HP & 25HP models, focusing on cost reduction, weight saving, and performance improvements. | 22th May 1931 | West Wittering \ V \ March1931-September1931 Scan216 | |
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