| Description | Date | Identifier | |
| Faults and issues found with various car components during testing, page 2. | 25th Feb 1936 | Box 82 \ 4 scan0264 | |
| How to handle potential customer complaints and 'dangerous items' before car delivery. | 25th Feb 1936 | Box 82 \ 4 scan0265 | |
| Query regarding increased petrol consumption for the 4 1/4 litre Bentley. | 26th Feb 1936 | Box 82 \ 4 scan0266 | |
| Blueprint figures, cylinder head comparisons, and petrol consumption for the 4 1/4 Litre Bentley. | 27th Feb 1936 | Box 82 \ 4 scan0267 | |
| Internal memorandum requesting the order and distribution of 12 custom springs. | 27th Feb 1936 | Box 82 \ 4 scan0268 | |
| Performance comparison graph showing horsepower, fuel consumption, and acceleration tests for a car converted from a 3.5-litre to a 4.25-litre engine. | 3rd Mar 1936 | Box 82 \ 4 scan0269 | |
| Technical memorandum discussing issues with seat fixings, clutch, oil consumption, and engine pinking. | 3rd Mar 1936 | Box 82 \ 4 scan0270 | |
| Experimental development for brakes to reduce squeaking and increase consistency. | 3rd Mar 1936 | Box 82 \ 4 scan0271 | |
| Modifications for Experimental Bentley and Phantom III cars. | 9th Mar 1936 | Box 82 \ 4 scan0272 | |
| Secret memo stressing the importance of secrecy for the Wraith II and Bentley III projects. | 16th Mar 1936 | Box 82 \ 4 scan0273 | |
| Summary of road test performance results for various car makes, compiled by 'THE MOTOR'. | 10th Mar 1936 | Box 82 \ 4 scan0274 | |
| Progress report on development work for the Phantom III, covering carburetter issues and engine noise. | 26th Mar 1936 | Box 82 \ 4 scan0275 | |
| Progress report on vehicle testing, covering components like tyres, gearbox, clutch, and steering. | 26th Mar 1936 | Box 82 \ 4 scan0276 | |
| Progress report on the 20/25 HP (22-G-V) vehicle, covering mileage tests, induction system issues, and specific component investigations. | 26th Mar 1936 | Box 82 \ 4 scan0277 | |
| The 'Big Bore Bentley' prototype, detailing mileage completed and key areas for experimental improvements. | 26th Mar 1936 | Box 82 \ 4 scan0278 | |
| Engine gear rattle issues in the 4¼ Litre Bentley production and potential solutions. | 12th Mar 1936 | Box 82 \ 4 scan0279 | |
| The satisfaction from production and chassis tests on the last Bentley series. | 12th Mar 1936 | Box 82 \ 4 scan0280 | |
| Timing gear 'sing' and 'rattle', and the feasibility of using Fabroil gears for the 4 1/4 Litre Bentley production. | 15th Mar 1936 | Box 82 \ 4 scan0281 | |
| Detonation tests on a Bentley car to determine the correct automatic advance curve. | 7th Apr 1936 | Box 82 \ 4 scan0282 | |
| Graph of the ignition advance curve versus speed for a B.23.A.E. deturbulated head with a 6.5-1 compression ratio. | 24th Apr 1936 | Box 82 \ 4 scan0283 | |
| The provision of a soft, non-nitrogen hardened shaft for a Bentley Chassis for experimental purposes. | 24th Apr 1936 | Box 82 \ 4 scan0284 | |
| Providing stopping distances for the 3 1/2 litre Bentley from an 'Autocar' road test. | 25th Apr 1936 | Box 82 \ 4 scan0285 | |
| Graph plotting stopping distance against speed for a Bentley 3 1/2 Litre car, based on a road test. | 28th May 1934 | Box 82 \ 4 scan0286 | |
| Graph plotting stopping distance in feet versus speed in MPH for a Bentley 3 1/2 Litre car. | 18th May 1934 | Box 82 \ 4 scan0287 | |
| Acknowledging receipt of information from a previous correspondence. | 27th Apr 1936 | Box 82 \ 4 scan0288 | |
| Cracking issue on the Bentley Head Lamp Cross Member and a proposed design change. | 1st May 1936 | Box 82 \ 4 scan0289 | |
| General car position report on Phantom III and 20/25 HP models, detailing test progress and issues. | 1st May 1936 | Box 82 \ 4 scan0290 | |
| Investigation into engine failure and a clutch issue on Bentley B-56-BN after going off the road. | 1st May 1936 | Box 82 \ 4 scan0291 | |
| Performance graph comparing the BHP and BMEP of a 3 1/2 Litre and a 4 1/4 Litre engine against RPM. | 4th May 1936 | Box 82 \ 4 scan0292 | |
| Requesting bore concentricity measurements for 3.5 and 4.25 litre Bentley engines at different temperatures. | 5th May 1936 | Box 82 \ 4 scan0293 | |
| Cracks developing in the dropped front cross member on Bentley models. | 6th May 1936 | Box 82 \ 4 scan0294 | |
| Blueprint diagram illustrating cracks on a mechanical part and its welding. | 23th Apr 1936 | Box 82 \ 4 scan0295 | |
| Request to make parts for a trial of a two-stage relief valve oiling scheme for a large bore Bentley. | 11th May 1936 | Box 82 \ 4 scan0296 | |
| Request to produce 3 modified Bentley Head Lamp Bracket Crossmembers due to failures in France. | 12th May 1936 | Box 82 \ 4 scan0297 | |
| Private letter discussing customer feedback and criticisms of the 4¼-litre Bentley. | 12th May 1936 | Box 82 \ 4 scan0298 | |
| Listing drawings being sent for a Bentley O.H.C. Conversion Engine. | 14th May 1936 | Box 82 \ 4 scan0299 | |
| Letter discussing vehicle performance issues including brakes, accommodation, oil consumption, and fuel mixtures. | 20th May 1936 | Box 82 \ 4 scan0300 | |
| Notice to withdraw a leaflet for the 4¼ litre Bentley Saloon due to inaccurate figures from an Autocar reprint. | 21th May 1936 | Box 82 \ 4 scan0301 | |
| Wheelbase and chassis modifications for the Bentley III to improve passenger space. | 26th May 1936 | Box 82 \ 4 scan0302 | |
| Vehicle wheelbase length, body design, luggage capacity, and spare wheel placement. | 27th May 1936 | Box 82 \ 4 scan0303 | |
| Letter discussing body space and high oil consumption issues on Bentley and other models. | 27th May 1936 | Box 82 \ 4 scan0304 | |
| Customer complaints and investigations into heavy oil consumption on specific vehicle chassis. | 27th May 1936 | Box 82 \ 4 scan0305 | |
| List of cars waiting for shop work and the required actions for each vehicle. | 27th May 1936 | Box 82 \ 4 scan0306 | |
| Planned work on a Packard, a specific car (GLG-5), and experiments on Phantom III models. | 27th May 1936 | Box 82 \ 4 scan0307 | |
| Code numbering changes for 'G' series Bentley Chassis due to a switch to large bore engines. | 29th May 1936 | Box 82 \ 4 scan0308 | |
| List of drawings sent for the Bentley O.H.C. Conversion Unit. | 29th May 1936 | Box 82 \ 4 scan0309 | |
| The stiffened headlamp cross member and wing stays on a Bentley chassis. | 3rd Jun 1936 | Box 82 \ 4 scan0310 | |
| The reason for omitting the propeller shaft damper on the 4¼-Litre Bentley. | 3rd Jun 1936 | Box 82 \ 4 scan0311 | |
| Successful experimental clutch modification on the 4 1/4 litre Bentley. | 4th Jun 1936 | Box 82 \ 4 scan0312 | |
| Letter discussing potential Bentley improvements, categorised for 'Speed Merchant' and 'Ordinary Owner' customer profiles. | 4th Jun 1936 | Box 82 \ 4 scan0313 | |
| Bentley chassis options, performance complaints, and reducing coachwork weights. | 4th Jun 1936 | Box 82 \ 4 scan0314 | |
| Engine oil consumption, endurance testing, and racing at Le Mans. | 4th Jun 1936 | Box 82 \ 4 scan0315 | |
| Log sheet recording daily oil consumption in M.P.G., mileage, and total mileage. | 11th Mar 1936 | Box 82 \ 4 scan0316 | |
| Inaccuracy of speedometer readings following a test by 'the Autocar' on a 4¼ litre Bentley. | 5th Jun 1936 | Box 82 \ 4 scan0317 | |
| Factors affecting the accuracy of Bentley speedometers, including tyre effects, temperature, and wear. | 9th Jun 1936 | Box 82 \ 4 scan0318 | |
| List of special units required for a Bentley O.H.C. Conversion Unit. | 10th Jun 1936 | Box 82 \ 4 scan0319 | |
| Ignition advance analysis and tests on turbulent lips for 20/25 HP and Bentley cylinder heads. | 10th Jun 1936 | Box 82 \ 4 scan0320 | |
| Tests of turbulent cylinder heads and ignition governors on Bentley and 20/25 models. | 10th Jun 1936 | Box 82 \ 4 scan0321 | |
| Bench test results for 25/30 HP ignition governors, comparing performance on standard and modified cylinder heads. | 9th Jun 1936 | Box 82 \ 4 scan0322 | |
| Specification for a Bentley type governor frame to obtain a 20° crank angle range, including comparison with Delco governors. | 9th Jun 1936 | Box 82 \ 4 scan0323 | |
| Pair of graphs showing road test results on a Bentley to determine maximum permissible advance to avoid detonation. | 16th May 1936 | Box 82 \ 4 scan0324 | |
| Graph of ignition governor curves for a test on a deturbulated head with a standard chassis exhaust silencer. | 16th May 1936 | Box 82 \ 4 scan0325 | |
| Graph showing ignition governor curves for a 25/30 standard turbulent head engine. | 16th May 1936 | Box 82 \ 4 scan0326 | |
| Ignition curve tests for a Bentley unit with standard and deturbulated cylinder heads. | 9th Jun 1936 | Box 82 \ 4 scan0327 | |
| Blueprint chart of ignition governor curves for a Bentley standard turbulent head engine. | 5th Jun 1936 | Box 82 \ 4 scan0328 | |
| Graph showing Bentley ignition governor curves for a deturbulated head. | 5th Jun 1936 | Box 82 \ 4 scan0329 | |
| Power comparison chart for a Bentley 4 1/4 Litre engine, contrasting standard turbulent and deturbulated cylinder heads. | 5th Jun 1936 | Box 82 \ 4 scan0330 | |
| Detonation tests conducted on 25/30 HP and Bentley cars using different cylinder heads. | 9th Jun 1936 | Box 82 \ 4 scan0331 | |
| Results of detonation tests conducted on a B-23-AE engine. | 9th Jun 1936 | Box 82 \ 4 scan0332 | |
| Engine detonation tests conducted on the 21-G-IV model. | 9th Jun 1936 | Box 82 \ 4 scan0333 | |
| Graph of detonation curves for a 21 G.T. car, comparing turbulent and deturbulated cylinder heads with different ignition systems. | 9th Jun 1936 | Box 82 \ 4 scan0334 | |
| Blueprint graph showing the Delco ignition curve and performance test results for two different cylinder heads. | 12th Jun 1936 | Box 82 \ 4 scan0335 | |
| Criticism from the press regarding 'fast' speedometers and proposing a conference to resolve the issue. | 12th Jun 1936 | Box 82 \ 4 scan0336 | |
| Letter to Delco-Remy & Hyatt Ltd. discussing spark gap issues and ignition timing for a Bentley. | 12th Jun 1936 | Box 82 \ 4 scan0337 | |
| Tests conducted on a Bentley Induction System using a spark gap. | 11th Jun 1936 | Box 82 \ 4 scan0338 | |
| Table of spark gap measurements in millimeters for a 6-cylinder engine and coil at various speeds and loads. | 8th May 1936 | Box 82 \ 4 scan0339 | |
| Reprint from 'The Autocar' magazine about the 4 1/4 Litre Bentley Saloon. | 8th May 1936 | Box 82 \ 4 scan0340 | |
| 'Autocar' magazine road test report for the 4¼-litre Bentley, detailing its performance, handling, and features. | 1st May 1936 | Box 82 \ 4 scan0341 | |
| Performance and specification data sheet for the 4¼-Litre Bentley Saloon. | 1st May 1936 | Box 82 \ 4 scan0342 | |
| The urgent need to modify the die for the Bentley & 25/30 high tension ignition rotor due to on-road failures. | 6th Jul 1936 | Box 82 \ 4 scan0343 | |
| Listing drawing numbers for the assembly of a Bentley O.H.C. Conversion Unit engine. | 9th Jul 1936 | Box 82 \ 4 scan0344 | |
| Request to make six governor drives for trial fitting of Delco Remy distributors on Bentley and 25/30 units. | 9th Jul 1936 | Box 82 \ 4 scan0345 | |
| Status report on Phantom III experimental cars, detailing work on clutches and steering systems. | 11th Jul 1936 | Box 82 \ 4 scan0346 | |
| Technical update regarding vapour lock, connecting rod big ends, and continental chassis replacements. | 11th Jul 1936 | Box 82 \ 4 scan0347 | |
| Idling improvements and oil consumption issues for the 20/25 HP 15,000 miles car. | 11th Jul 1936 | Box 82 \ 4 scan0348 | |
| 15,000-mile car, clutch variations and testing, and brake jagger issues. | 11th Jul 1936 | Box 82 \ 4 scan0349 | |
| Order for Bentley chassis horns and a possible part substitution. | 6th Aug 1936 | Box 82 \ 4 scan0350 | |
| Stating that a standardisation sheet for Bentley chassis horns cannot be issued at present. | 7th Aug 1936 | Box 82 \ 4 scan0351 | |
| Performance comparison between a 4¼ Litre Bentley and a Cadillac 8 Cyl. Vee. | 10th Aug 1936 | Box 82 \ 4 scan0352 | |
| Typed memorandum page discussing improvements to American performance. | 10th Aug 1936 | Box 82 \ 4 scan0353 | |
| Requesting a report on the use of an Acme thread on a Bijur starter pinion for 25/30 and Bentley models. | 17th Aug 1936 | Box 82 \ 4 scan0354 | |
| The Acme Thread on a Bijur Starter Pinion for 25/30 HP and Bentley models, discussing cold start testing. | 19th Aug 1936 | Box 82 \ 4 scan0355 | |
| Expressing disappointment with the lack of support for cost-saving efforts on Bentley parts, specifically a new exhaust system. | 20th Aug 1936 | Box 82 \ 4 scan0356 | |
| Cost analysis of existing Bentley parts compared with potential alternative reductions. | 25th Aug 1936 | Box 82 \ 4 scan0357 | |
| Parts list for Bentley valves, detailing part numbers, quantities, and costs for materials and labour. | 25th Aug 1936 | Box 82 \ 4 scan0358 | |
| Explaining the delay in costing the modified Bentley Exhaust System for standardisation purposes. | 25th Aug 1936 | Box 82 \ 4 scan0359 | |
| Recurring rotor failure on the Bentley 25/30 HP chassis due to spark earthing, and the urgent need to implement a new design with an air gap. | 25th Aug 1936 | Box 82 \ 4 scan0360 | |
| The general car position, detailing ongoing tests and issues for the Phantom III model. | 28th Aug 1936 | Box 82 \ 4 scan0361 | |
| Technical report on exhaust boom, valve springs, and connecting rod bearing issues. | 28th Aug 1936 | Box 82 \ 4 scan0362 | |
| Test results and ongoing investigations for various car components and models. | 28th Aug 1936 | Box 82 \ 4 scan0363 | |
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