| Description | Date | Identifier | |
| List of design specifications and modifications for various vehicle components. | 22th Mar 1933 | Box 3 \ 4 04-page243 | |
| List of vehicle component modifications and their corresponding design reference numbers. | 22th Mar 1933 | Box 3 \ 4 04-page244 | |
| List of modifications to frames, fittings, and petrol tanks with corresponding design numbers. | 23th Mar 1933 | Box 3 \ 4 04-page245 | |
| Amendments, specifications, and outstanding work for the Bensport Series I model. | 23th Mar 1933 | Box 3 \ 4 04-page246 | |
| Performance test results for a Bensport C.10 engine unit. | 24th Mar 1933 | Box 3 \ 4 04-page247 | |
| Bentley engine ignition timing tests and recommendations based on different fuel octane ratings. | 25th Mar 1933 | Box 3 \ 4 04-page248 | |
| Engine specifications, valve timing, and performance test results for the Bensport C.10 unit. | 24th Mar 1933 | Box 3 \ 4 04-page249 | |
| Components for the Bensport Series 1. | 25th Mar 1933 | Box 3 \ 4 04-page250 | |
| Ignition advance curve for a Bentley engine to prevent detonation. | 31th Mar 1933 | Box 3 \ 4 04-page251 | |
| Graph showing ignition governor advance curves for a 25 HP engine. | 31th Mar 1933 | Box 3 \ 4 04-page252 | |
| Urgency of producing parts for experimental testing of 'Bensport' features. | 31th Mar 1933 | Box 3 \ 4 04-page253 | |
| Return and testing of a prototype Bentley car, and plans for the next version for production. | 7th Apr 1933 | Box 3 \ 4 04-page254 | |
| Incomplete 3.5 litre Bentley chassis print, requesting review and completion by the Derby office. | 13th Apr 1933 | Box 3 \ 4 04-page255 | |
| Completion and testing of a second Bentley car before sending a production model to France. | 14th Apr 1933 | Box 3 \ 4 04-page256 | |
| From P.N. arranging a meeting in Derby to discuss points from a report and bonnet panel stops for the Bentley I. | 19th Apr 1933 | Box 3 \ 4 04-page257 | |
| Instruction memo regarding the experimental fitting of double valve springs and washers for Bensport. | 19th Apr 1933 | Box 3 \ 4 04-page258 | |
| Proposed solutions for failures and troubles on a Bensport car after 12,200 miles. | 21th Apr 1933 | Box 3 \ 4 04-page259 | |
| List of ongoing investigations and improvements for various vehicle components. | 21th Apr 1933 | Box 3 \ 4 04-page260 | |
| List of observations and modifications for a vehicle, covering radiator mounting, dynamo brushes, spring anchorage, floorboards, and wheel hubs. | 21th Apr 1933 | Box 3 \ 4 04-page261 | |
| Design and testing of a sheet metal bracket for a Bensport spare ignition coil. | 22th Apr 1933 | Box 3 \ 4 04-page262 | |
| Readiness, features, and the official naming of the 3 1/2-litre Bentley car. | 24th Apr 1933 | Box 3 \ 4 04-page263 | |
| Testing protocol and handover of the 3½-litre Bentley cars to the Sales department. | 26th Apr 1933 | Box 3 \ 4 04-page264 | |
| Testing different spark plugs to improve the slow running of a Bentley engine. | 1st Aug 1933 | Box 3 \ 4 04-page265 | |
| Road test report and feedback on the Bensport 1.B.S. model, noting both praises and areas for improvement. | 21th May 1933 | Box 3 \ 4 04-page266 | |
| Dynamometer test report for Chassis 2.B.IV, detailing axle and power curve evaluations. | 5th May 1933 | Box 3 \ 4 04-page267 | |
| Engine power output (BHP) test results table with notes on ignition settings. | 5th May 1933 | Box 3 \ 4 04-page268 | |
| Test report comparing power output from different fuel feed systems and detailing petrol pump delivery rates at various engine speeds. | 1st Nov 1943 | Box 3 \ 4 04-page269 | |
| Test report on speedometer and rev-counter accuracy, with observations on car behaviour on a dynamometer. | 1st Nov 1943 | Box 3 \ 4 04-page270 | |
| Test report noting the cooling method for the rear axle casing and the absence of issues. | 8th May 1933 | Box 3 \ 4 04-page271 | |
| Test report to determine the best 14mm sparking plug for slow running. | 8th May 1933 | Box 3 \ 4 04-page272 | |
| Requesting a status update on the readiness of the No.3, 3.5-litre Bentley car for testing. | 8th Sep 1933 | Box 3 \ 4 04-page273 | |
| Very favourable first test drive of the Bensport car, noting its excellent performance but also a significant issue with fumes inside the body. | 1st May 1933 | Box 3 \ 4 04-page274 | |
| Progress update regarding the 3.5-litre Bentley car, specifically production details and body mounting for car No.3. | 9th May 1933 | Box 3 \ 4 04-page275 | |
| The body mounting and trial arrangements for the 3 1/2-litre Bentley car. | 11th May 1933 | Box 3 \ 4 04-page276 | |
| Status report on debatable points concerning the Bentley's carburettors, induction system, air intake silencer, and engine breathing. | 15th May 1933 | Box 3 \ 4 04-page277 | |
| List of required modifications and tests for vehicle components including brakes, exhaust, petrol pump, and engine. | 15th May 1933 | Box 3 \ 4 04-page278 | |
| Road test and performance review of the Bensport No.1 vehicle. | 15th May 1933 | Box 3 \ 4 04-page279 | |
| Potential vehicle improvements regarding carburetters, weight reduction, and observed issues with the tachometer and steering. | 15th May 1933 | Box 3 \ 4 04-page280 | |
| Modifications and testing for the second Bentley car. | 15th May 1933 | Box 3 \ 4 04-page281 | |
| The Brooklands test comparing two Bentley cars against competitors. | 16th May 1933 | Box 3 \ 4 04-page282 | |
| Development work and outstanding items for the 3.5 litre Bentley. | 19th May 1933 | Box 3 \ 4 04-page283 | |
| Modifications to the front appearance of a Bentley, focusing on the radiator and body styling. | 22th May 1933 | Box 3 \ 4 04-page284 | |
| Cover note for attached discussion notes concerning the Bensport Chassis. | 23th May 1933 | Box 3 \ 4 04-page285 | |
| Issues and modifications for the Bensport Chassis, focusing on the air silencer and crankshaft bearings. | 23th May 1933 | Box 3 \ 4 04-page286 | |
| Design and development report on automotive components including radiators, exhausts, cylinder heads, and gear levers. | 3rd Nov 1935 | Box 3 \ 4 04-page287 | |
| Status report on modifications and production for various vehicle components. | 23th May 1933 | Box 3 \ 4 04-page288 | |
| Reducing ignition advance due to an increased compression ratio on a Bentley engine. | 24th May 1933 | Box 3 \ 4 04-page289 | |
| Road test results for an ignition governor, recommending a new spring and restricted auto advance. | 30th Mar 1933 | Box 3 \ 4 04-page290 | |
| Blueprint detailing specifications and performance curves for a Bentley ignition system. | 1st May 1923 | Box 3 \ 4 04-page291 | |
| Use of a smaller ampere field fuse for a Bentley wiring diagram. | 31th May 1933 | Box 3 \ 4 04-page292 | |
| Cover note for the minutes of a conference at Derby to discuss the 3.5-litre Bentley. | 31th May 1933 | Box 3 \ 4 04-page293 | |
| Minutes of a conference at Derby to discuss the 3 1/2-litre Bentley. | 30th May 1933 | Box 3 \ 4 04-page294 | |
| Meeting minutes discussing design decisions for bonnets, bodies, lamps, and speed indicators for Bentley models. | 31th May 1933 | Box 3 \ 4 04-page295 | |
| Meeting minutes discussing deliveries, test bodies, shutters, and standards for Bentley chassis. | 31th May 1933 | Box 3 \ 4 04-page296 | |
| Parts held up for the 3.5 Litre Bentley, awaiting decisions on wheels, undershields, and carriers. | 1st Jun 1933 | Box 3 \ 4 04-page297 | |
| Alterations and instructions for the Bentley Ignition Governor. | 1st Jun 1933 | Box 3 \ 4 04-page298 | |
| The critical need to control modifications to the 3½ Litre Bentley instructions for the initial chassis and production sets. | 2nd Jun 1933 | Box 3 \ 4 04-page299 | |
| Design of undershields for the 3.5 litre Bentley and the re-issuing of drawings for the first 15 chassis. | 2nd Jun 1933 | Box 3 \ 4 04-page300 | |
| Requesting information on power loss in 6 1/4 & 8 litre engines, B.HP figures for a 4 1/4 litre engine, and the Oldham coupling on a 4 litre engine. | 2nd Jun 1933 | Box 3 \ 4 04-page301 | |
| Modified travel arrangements for a Bentley II vehicle for a function in Bath and a meeting at Brooklands. | 2nd Jun 1933 | Box 3 \ 4 04-page302 | |
| Outlining the production expectations and specifications for a 3½ Litre Bentley saloon car. | 3rd Jun 1933 | Box 3 \ 4 04-page303 | |
| Checking the efficiency of a new cut-out and the confirmed performance of a petrol pump. | 3rd Jun 1938 | Box 3 \ 4 04-page304 | |
| The average lap speeds of three different Bentley models tested at Brooklands track. | 3rd Jun 1933 | Box 3 \ 4 04-page305 | |
| Test run report on a Bentley 2-B-LV, detailing performance, consumption, and areas for improvement. | 7th Jun 1933 | Box 3 \ 4 04-page306 | |
| Test report on a car's handling characteristics, including steering, suspension, and exhaust note. | 7th Jun 1933 | Box 3 \ 4 04-page307 | |
| Brief acknowledgement memo regarding the 3 1/2 litre Bentley Car. | 7th Jun 1933 | Box 3 \ 4 04-page308 | |
| Test drive impression report on a Bentley Blue Coupe. | 9th Jun 1933 | Box 3 \ 4 04-page309 | |
| Responding to queries about a 4 1/2 litre engine crankshaft and a Bosch coupling. | 10th Jun 1933 | Box 3 \ 4 04-page310 | |
| List of criticisms and proposed improvements for a Bentley Car. | 12th Jun 1933 | Box 3 \ 4 04-page311 | |
| Cover memo forwarding a Sergeant's report on a Bentley car test run. | 13th Jun 1933 | Box 3 \ 4 04-page312 | |
| Feedback from a 100-mile test run of a Bentley, focusing on performance issues. | 11th Jun 1933 | Box 3 \ 4 04-page313 | |
| Letter discussing vehicle performance reports, a failed supercharger project, and concerns over new model characteristics. | 13th Jun 1933 | Box 3 \ 4 04-page314 | |
| Summary of proposed experiments for the power development of the Bentley car. | 13th Jun 1933 | Box 3 \ 4 04-page315 | |
| Performance testing and required upgrades for a C.13 unit from a Bentley saloon car. | 15th Jun 1933 | Box 3 \ 4 04-page316 | |
| Feedback on the Bentley No.2 car regarding its speed, steering, and silencer quietness. | 16th Jun 1933 | Box 3 \ 4 04-page317 | |
| Synopsis of discussions and criticisms regarding a Bentley car's performance, particularly its top speed. | 15th Jun 1933 | Box 3 \ 4 04-page318 | |
| Car performance issues including high-speed steering, radiator design, and air silencer tests. | 15th Jun 1933 | Box 3 \ 4 04-page319 | |
| Modifications and feedback on a Bentley model, focusing on silencing and differentiation from Rolls-Royce features. | 6th Jun 1933 | Box 3 \ 4 04-page320 | |
| List of design criticisms and proposed coachwork modifications for a vehicle. | 15th Jun 1933 | Box 3 \ 4 04-page321 | |
| Test drive report and critique of a Bentley car. | 9th Jun 1933 | Box 3 \ 4 04-page322 | |
| Test drive report for car B.II, including performance notes from Brooklands and a comparison to car B.I. | 9th Jun 1933 | Box 3 \ 4 04-page323 | |
| First-hand account and test drive report of the No.2 Bentley, comparing it to the 20/25 HP model. | 9th Jun 1933 | Box 3 \ 4 04-page324 | |
| Concluding statement from a report, likely following a test drive. | 9th Jun 1933 | Box 3 \ 4 04-page325 | |
| Test drive report and critique of a car's performance, handling, and design following a 300-mile run. | 8th Jun 1933 | Box 3 \ 4 04-page326 | |
| Road test report evaluating a vehicle's performance, handling, comfort, and comparison to other models. | 1st Jun 1933 | Box 3 \ 4 04-page327 | |
| Performance critique and road test report of a Bentley car. | 1st Jun 1933 | Box 3 \ 4 04-page328 | |
| Test driver's report on vehicle handling with suggestions for design improvements. | 1st Jun 1933 | Box 3 \ 4 04-page329 | |
| List of design recommendations and observations for a sports car model. | 1st Jun 1933 | Box 3 \ 4 04-page330 | |
| The test drive and evaluation of a supercharged Alfa Romeo 8 Cylinder 2 Litre sports car. | 16th Jun 1935 | Box 3 \ 4 04-page331 | |
| Performance comparisons against Alfa, Livia, Lagonda and Invicta cars. | 16th May 1935 | Box 3 \ 4 04-page332 | |
| And seeking a decision on the best and most economical finish for the Bentley engine. | 16th Jun 1933 | Box 3 \ 4 04-page333 | |
| The performance of the 3 1/2 litre Bentley, comparing speeds, and discussing streamlined body investigations. | 17th Jun 1933 | Box 3 \ 4 04-page334 | |
| Criticisms, anxieties, and comparisons of the 3.5 Litre Bentley regarding its performance, steering, engine noise, and price justification. | 17th Jun 1933 | Box 3 \ 4 04-page335 | |
| Alternative colour finishes for the Bentley engine to differentiate it from Rolls-Royce engines. | 19th Jun 1933 | Box 3 \ 4 04-page336 | |
| Comparing the performance of a supercharged Alfa Romeo to a 3.5-litre Bentley. | 19th Jun 1933 | Box 3 \ 4 04-page337 | |
| Performance, steering, and noise issues of a Bentley car after testing at Brooklands. | 19th Jun 1933 | Box 3 \ 4 04-page338 | |
| Bentley car performance, focusing on the trade-off between silence and speed, and mentioning ongoing vehicle tests. | 19th Jun 1933 | Box 3 \ 4 04-page339 | |
| Progress report on the Bentley (Bensport) cars and the halted Peregrine project. | 21th Jun 1933 | Box 3 \ 4 04-page340 | |
| Critiques of the Bentley Facia Board and the potential impact on instrument arrangement and material supply. | 21th Jun 1933 | Box 3 \ 4 04-page341 | |
| Effects of turbulent and non-turbulent cylinder heads on engine power output. | 21th May 1933 | Box 3 \ 4 04-page342 | |
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