| Description | Date | Identifier | |
| Replacement of a cross rod on Bentley Girling rear brakes to prevent failure. | 16th Feb 1938 | Box 83 \ 2 scan0237 | |
| Modifications to a car's braking system and the addition of a cross member stiffener. | 16th Feb 1938 | Box 83 \ 2 scan0238 | |
| Arranging the dispatch of a Delco Distributor for a Bentley 6-B-IV being tested in France. | 16th Feb 1938 | Box 83 \ 2 scan0239 | |
| Bentley brake issues, detailing modifications and testing results, including a sketch of a new tubular stay. | 18th Feb 1938 | Box 83 \ 2 scan0240 | |
| 10,000-mile road test in France, detailing impressions of the Wraith and Bentley models. | 18th Feb 1938 | Box 83 \ 2 scan0241 | |
| Car performance testing, detailing identified issues and potential improvements for production. | 18th Feb 1938 | Box 83 \ 2 scan0242 | |
| Technical report on the performance of Girling rear brakes, standard front brakes, and various coachwork components. | 18th Feb 1938 | Box 83 \ 2 scan0243 | |
| Intention to test a lock on new B.III and B.50 bodies. | 18th Feb 1938 | Box 83 \ 2 scan0244 | |
| Summary of daily test reports concerning vehicle coachwork issues such as creaks, rattles, and door gaps. | 18th Feb 1938 | Box 83 \ 2 scan0245 | |
| Weak fuel mixture issue in cold conditions and proposing solutions for air temperature control. | 21th Feb 1938 | Box 83 \ 2 scan0246 | |
| Enquiry into the number of Bentley front bumper-bar spring plate breakages reported by the Paris Depot. | 21th Feb 1938 | Box 83 \ 2 scan0247 | |
| Various issues and solutions for Wraith and Bentley vehicles. | 21th Feb 1938 | Box 83 \ 2 scan0248 | |
| Scheme for the Bentley 111 starting handle and front bumper bracket for record purposes. | 21th Feb 1938 | Box 83 \ 2 scan0249 | |
| Comparison of end thrusts in yoke bushings on B.III and Packard suspension systems. | 23th Feb 1938 | Box 83 \ 2 scan0250 | |
| Calculations for end thrust and its horizontal component along a bushing. | 23th Feb 1938 | Box 83 \ 2 scan0251 | |
| Modification to the Bentley 111 and 50 rear axle bearing cover. | 23th Feb 1938 | Box 83 \ 2 scan0252 | |
| Parts dispatch, vehicle faults, and engine test results for Bentley and Wraith models. | 23th Feb 1938 | Box 83 \ 2 scan0253 | |
| Parts being prepared to modify brake systems on Bentley and Wraith cars to address juddering issues. | 23th Feb 1938 | Box 83 \ 2 scan0254 | |
| Low speed wobble and a potential foul in the steering systems of 6.B.IV and 26.G.V1 chassis. | 23th Feb 1938 | Box 83 \ 2 scan0255 | |
| Poor carburation in a Bentley in snowy conditions and a proposed solution. | 23th Feb 1938 | Box 83 \ 2 scan0256 | |
| Requesting the despatch of two complete wheels and tyres to Mr. I.M. Waller in France. | 24th Feb 1938 | Box 83 \ 2 scan0257 | |
| List of body numbers for Experimental and other Wraith models, including a report on bodywork issues. | 24th Feb 1938 | Box 83 \ 2 scan0258 | |
| Road test observations of Gordon Armstrong rear dampers on a Bentley. | 24th Feb 1938 | Box 83 \ 2 scan0259 | |
| 'cold air effect' on carburation and a proposed solution involving the air silencer. | 24th Feb 1938 | Box 83 \ 2 scan0260 | |
| Troubleshooting of electrical equipment, specifically coil misfires and spark plug issues on vehicles. | 24th Feb 1938 | Box 83 \ 2 scan0261 | |
| Rattle from the rear brake equaliser on a 6.B.IV. Bentley. | 24th Feb 1938 | Box 83 \ 2 scan0262 | |
| Non-standard body tail brackets fitted by coachbuilders. | 26th Feb 1938 | Box 83 \ 2 scan0263 | |
| Request for examination of a failed Bentley back axle pinion due to suspected slag inclusions. | 26th Feb 1938 | Box 83 \ 2 scan0264 | |
| Steering issues, wheel wobble, and tyre performance on a Bentley vehicle. | 28th Feb 1938 | Box 83 \ 2 scan0265 | |
| Vehicle performance, including tyre tests, servo judders, and cold weather engine behaviour. | 28th Feb 1938 | Box 83 \ 2 scan0266 | |
| Confidential letter to Park Ward & Co. Ltd. confirming coachwork specifications for a Short Wheelbase Bentley. | 28th Feb 1938 | Box 83 \ 2 scan0267 | |
| List of specifications for various car body components and features, page 2. | 28th Feb 1938 | Box 83 \ 2 scan0268 | |
| List of specifications for car body components and construction details, page 3. | 28th Feb 1938 | Box 83 \ 2 scan0269 | |
| Steering wobbles and ball joint poundage on a Bentley. | 28th Feb 1938 | Box 83 \ 2 scan0270 | |
| Brake lever modifications and testing for Bentley and Wraith models to adjust braking proportions and prevent servo judder. | 28th Feb 1938 | Box 83 \ 2 scan0271 | |
| Curing judder using star springs and adjusting front braking on wet roads. | 28th Feb 1938 | Box 83 \ 2 scan0272 | |
| Test results, issues, and next steps for Bentley and Wraith vehicles. | 2nd Mar 1938 | Box 83 \ 2 scan0273 | |
| Brake judder issues on a Wraith and sending replacement star springs and a front pull off spring. | 2nd Mar 1938 | Box 83 \ 2 scan0274 | |
| To I.M. Waller in France regarding a print for fitting springs. | 3rd Mar 1938 | Box 83 \ 2 scan0275 | |
| Improvements to the front suspension's rubber bushes and bearings. | 3rd Mar 1938 | Box 83 \ 2 scan0276 | |
| Bentley accident in Paris which damaged the front axle and two wheels, causing a delay. | 4th Mar 1938 | Box 83 \ 2 scan0277 | |
| Confirming a Bentley car has returned to Châteauroux and is running satisfactorily. | 5th Mar 1938 | Box 83 \ 2 scan0278 | |
| Progress report on the 15,000-mile endurance test in France for the Bentley and Wraith models. | 7th Mar 1938 | Box 83 \ 2 scan0279 | |
| Vehicle testing, component checks, and logistical arrangements for cars in Chateauroux. | 7th Mar 1938 | Box 83 \ 2 scan0280 | |
| The examination and modification of a Bentley's brake system, including front drum cracks and rear lever adjustments. | 7th Mar 1938 | Box 83 \ 2 scan0281 | |
| Three successive changes to a vehicle's braking and servo lever system. | 7th Mar 1938 | Box 83 \ 2 scan0282 | |
| Recommendation for a system of levers for production, detailing tests and component specifications. | 7th Mar 1938 | Box 83 \ 2 scan0283 | |
| Showing hand brake linkage diagrams and leverage calculations for different schemes. | 7th Mar 1938 | Box 83 \ 2 scan0284 | |
| With calculations for the servo to rear brakes lever system. | 7th Mar 1938 | Box 83 \ 2 scan0285 | |
| Diagram and calculations for the direct foot to rear brakes linkage. | 7th Mar 1938 | Box 83 \ 2 scan0286 | |
| French road tests on a Bentley, its return to England for repairs, and future plans for a Wraith car. | 8th Mar 1938 | Box 83 \ 2 scan0287 | |
| Trouble with a ball pin taper on rear dampers and roll rod links due to incorrect fitting. | 9th Mar 1938 | Box 83 \ 2 scan0288 | |
| From Chateauroux discussing testing results for the Bentley front brakes and the Wraith servo. | 9th Mar 1938 | Box 83 \ 2 scan0289 | |
| List of 20 faults discovered on a Bentley 10,000 Miles Test Car after completing 10,561 miles. | 10th Mar 1938 | Box 83 \ 2 scan0290 | |
| Damage sustained by a Bentley test car in France during a road incident. | 11th Mar 1938 | Box 83 \ 2 scan0291 | |
| The testing and performance of sparking plugs and ignition components on specific vehicles. | 11th Mar 1938 | Box 83 \ 2 scan0292 | |
| Test report on spark plug and ignition component performance over mileage for car 26.G.VI. | 11th Mar 1938 | Box 83 \ 2 scan0293 | |
| Covering letter sending a report on '6.B.IV. - BENTLEY' for approval and comments. | 13th Mar 1938 | Box 83 \ 2 scan0294 | |
| Summary of results from a 15,000-mile test on a Bentley 6.B.IV car, detailing the performance of special features. | 13th Mar 1938 | Box 83 \ 2 scan0295 | |
| Test report detailing the performance and endurance of various engine components. | 13th Mar 1938 | Box 83 \ 2 scan0296 | |
| Results of tests on various automotive parts over specified mileages. | 13th Mar 1938 | Box 83 \ 2 scan0297 | |
| Test report detailing the performance and issues of various vehicle components after mileage accumulation. | 13th Mar 1938 | Box 83 \ 2 scan0298 | |
| Test report on various axle, bearing, and brake components. | 13th Mar 1938 | Box 83 \ 2 scan0299 | |
| Test results for modifications to anti-judder levers, brake drums, linings, and servo springs. | 13th Mar 1938 | Box 83 \ 2 scan0300 | |
| Test results for modifications to brakes and steering systems on a Bentley. | 13th Mar 1938 | Box 83 \ 2 scan0301 | |
| Results of mileage tests on various car components. | 13th Mar 1938 | Box 83 \ 2 scan0302 | |
| Test report detailing the performance of various vehicle components over mileage. | 13th Mar 1938 | Box 83 \ 2 scan0303 | |
| Test report detailing the performance of various electrical and engine components. | 13th Mar 1938 | Box 83 \ 2 scan0304 | |
| Test results for corrugated metal joint washers and a special front bumper bar. | 13th Mar 1938 | Box 83 \ 2 scan0305 | |
| General notes on the running performance and issues encountered with a vehicle's engine, clutch, and transmission during a mileage test. | 13th Mar 1938 | Box 83 \ 2 scan0306 | |
| Performance and component evaluation report, including data on fuel/oil consumption and engine pressures. | 13th Mar 1938 | Box 83 \ 2 scan0307 | |
| The performance and issues of a special Park-Ward car body. | 13th Mar 1938 | Box 83 \ 2 scan0308 | |
| The issues found during a 300-mile test run, including body rattles and various other complaints. | 14th Mar 1938 | Box 83 \ 2 scan0309 | |
| Requesting various maintenance and repair tasks to be carried out on a car. | 14th Mar 1938 | Box 83 \ 2 scan0310 | |
| Need to replace the deteriorating body on test car 6.B.IV before completing its mileage test. | 15th Mar 1938 | Box 83 \ 2 scan0311 | |
| Poor outcome of an experimental car body and arrangements for its replacement by Park Ward & Co. | 16th Mar 1938 | Box 83 \ 2 scan0312 | |
| Correspondence regarding a 10,000-mile test report for car 6.B.IV in France and its return to Derby. | 18th Mar 1938 | Box 83 \ 2 scan0313 | |
| The reversed throttle spring for Bentleys, recommending it for standardisation to prevent idling speed variations. | 18th Mar 1938 | Box 83 \ 2 scan0314 | |
| Failure and analysis of a preloaded pinion bearing in a rear axle. | 21th Mar 1938 | Box 83 \ 2 scan0315 | |
| Advanced state of disintegration of a Bentley body by Park Ward following French tests. | 21th Mar 1938 | Box 83 \ 2 scan0316 | |
| Laboratory report on the failure analysis of a Bentley back axle pinion. | 21th Mar 1938 | Box 83 \ 2 scan0317 | |
| Laboratory report showing the failure of a Bentley back axle pinion roller track. | 21th Mar 1938 | Box 83 \ 2 scan0318 | |
| Laboratory report on a Bentley back axle pinion, showing a transverse section and fracture of the case on the roller track. | 21th Mar 1938 | Box 83 \ 2 scan0319 | |
| Post office telegram to Robotham at Roycar Derby advising that 'SIX B FOUR' is ready for collection. | 24th Aug 1924 | Box 83 \ 2 scan0320 | |
| Removal, examination, and re-assembly of a propeller shaft from car 6.B.IV. | 30th Mar 1938 | Box 83 \ 2 scan0321 | |
| Usage of transport car 6.B.IV and assigning responsibility for it. | 30th Mar 1938 | Box 83 \ 2 scan0322 | |
| Inquiry requesting further details about alleged damage to an O.S.R. wing. | 31th Mar 1938 | Box 83 \ 2 scan0323 | |
| Note on damage to the offside rear wing and back door, with speculation on the cause. | 2nd Apr 1938 | Box 83 \ 2 scan0324 | |
| Problem with a Bentley's off-side rear door not shutting properly. | 4th Apr 1938 | Box 83 \ 2 scan0325 | |
| Requesting the re-spoking of damaged wheels for car 6.B.IV, with a handwritten reply. | 6th Apr 1938 | Box 83 \ 2 scan0326 | |
| Follow-up note regarding damage to a Bentley's offside back door. | 7th Apr 1938 | Box 83 \ 2 scan0327 | |
| Urgent request to fit a new corrugated flexible copper connection to a chassis filler head. | 12th Apr 1938 | Box 83 \ 2 scan0328 | |
| Urgent request to fit a new corrugated flexible copper connection to a chassis filler head. | 12th Apr 1938 | Box 83 \ 2 scan0329 | |
| The testing and replacement of a thermostat scheme on a Bentley test car. | 22th Apr 1938 | Box 83 \ 2 scan0330 | |
| Requesting the removal and stripping of an overdrive gearbox and Girling Brakes for examination. | 25th Apr 1938 | Box 83 \ 2 scan0331 | |
| After 15,000-mile test report giving impressions on the gearbox and clutch performance of car 6-B-IV. | 30th Apr 1938 | Box 83 \ 2 scan0332 | |
| Test driver's feedback report on vehicle handling and controls. | 30th Apr 1938 | Box 83 \ 2 scan0333 | |
| Typed report detailing issues with a vehicle's horn, coachwork, and top speed performance. | 30th Apr 1938 | Box 83 \ 2 scan0334 | |
| Modifications for a Long C.F. Clutch on chassis 6.B.IV. | 2nd May 1938 | Box 83 \ 2 scan0335 | |
| Fitting brakes to chassis 6.B.IV using parts from other vehicles. | 3rd May 1938 | Box 83 \ 2 scan0336 | |
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