| Description | Date | Identifier | |
| Performance and issues of Autoflux petrol pumps, with comparisons to other marques. | 24th Aug 1933 | Box 82 \ 1 scan0222 | |
| Telegram reporting a broken connecting rod and engine case. | 15th Aug 1933 | Box 82 \ 1 scan0223 | |
| Testing of an Autoflux petrol pump, piston conditions, temperature variations, and a proposed radiator change. | 25th Aug 1933 | Box 82 \ 1 scan0224 | |
| The examination and faults of vehicle components including the cutout, ignition, fuel system, and engine. | 25th Aug 1933 | Box 82 \ 1 scan0225 | |
| Hand-drawn and colored diagram of a fuel piping system with a filter and tap. | 26th Aug 1935 | Box 82 \ 1 scan0226 | |
| Telegram reporting an engine as 'hopeless' and 'impossible to run' and requesting a new one. | 26th Aug 1935 | Box 82 \ 1 scan0227 | |
| Catastrophic engine failure during a high-speed run, including damage assessment and telegram correspondence. | 26th Aug 1933 | Box 82 \ 1 scan0228 | |
| Petrol pump delivery tests, measuring flow rates from the tank at different starting fuel levels. | 26th Aug 1933 | Box 82 \ 1 scan0229 | |
| Telegram regarding a car with a sealed bonnet held at customs, requiring transport for it to be resealed. | 28th Aug 1933 | Box 82 \ 1 scan0230 | |
| Letter detailing modifications to S.U. petrol pumps and arrangements for car shipment from France to Derby. | 28th Aug 1933 | Box 82 \ 1 scan0231 | |
| Confirming the situation of various goods, brake parts, and springs. | 4th Sep 1933 | Box 82 \ 1 scan0232 | |
| Delays in transporting car 1.B.IV from France to Derby for examination. | 8th Sep 1933 | Box 82 \ 1 scan0233 | |
| Strip report on the condition of a B.4 Unit dismantled following the failure of a balance weight stud. | 29th Sep 1933 | Box 82 \ 1 scan0234 | |
| Condition report detailing the state of engine components including pistons, rods, bearings, and cylinders. | 29th Sep 1933 | Box 82 \ 1 scan0235 | |
| Inspection report detailing the condition and wear of various mechanical components. | 29th Sep 1933 | Box 82 \ 1 scan0236 | |
| Test report on the condition of camshafts and crankcase bearer arms following testing. | 29th Sep 1933 | Box 82 \ 1 scan0237 | |
| Chassis 1-B-4 being taken for a second 10,000-mile test in France. | 30th Sep 1933 | Box 82 \ 1 scan0238 | |
| Requesting a report on specific components during a Bentley 10,000-mile test. | 28th Sep 1933 | Box 82 \ 1 scan0239 | |
| Post Office Telegraph form confirming that a car ran well. | 2nd Oct 1933 | Box 82 \ 1 scan0240 | |
| Car's performance and issues during a road test from France. | 3rd Oct 1933 | Box 82 \ 1 scan0241 | |
| Car's springing and ride comfort issues on various road types. | 3rd Oct 1933 | Box 82 \ 1 scan0242 | |
| Improvements to steering and dampers, and reporting issues with radiator mounting and bonnet brackets. | 4th Oct 1933 | Box 82 \ 1 scan0243 | |
| Investigating roughness at high speeds, suggesting the cause may be the propeller shaft or needle bearings. | 5th Oct 1933 | Box 82 \ 1 scan0244 | |
| Letter to Mr. G.W. Hancock in France regarding car performance issues and settings. | 5th Oct 1933 | Box 82 \ 1 scan0245 | |
| Brake fade issues on test cars and arranging a comparative test run. | 5th Oct 1933 | Box 82 \ 1 scan0246 | |
| Post office telegram reporting on car mileage and the status of a report. | 9th Oct 1923 | Box 82 \ 1 scan0247 | |
| Typed communication regarding the progress and issues of a vehicle mileage test. | 6th Oct 1933 | Box 82 \ 1 scan0248 | |
| Typed telegram to G.W. Hancock in France regarding a mileage test. | 6th Oct 1933 | Box 82 \ 1 scan0249 | |
| Status of various vehicle components after testing. | 9th Oct 1933 | Box 82 \ 1 scan0250 | |
| Findings on vehicle performance issues including pedals, engine roughness, oil consumption, and dampers. | 7th Oct 1933 | Box 82 \ 1 scan0251 | |
| Telegram regarding trouble with new pistons and the requirement for a modified cylinder block. | 11th Oct 1933 | Box 82 \ 1 scan0252 | |
| Telegram regarding a split piston that probably needs to be despatched. | 30th Oct 1929 | Box 82 \ 1 scan0253 | |
| Radiator tests comparing performance with shutters open versus in operation at high speeds. | 11th Oct 1933 | Box 82 \ 1 scan0254 | |
| Telegram from Hancock to Hives reporting a bad piston knock at 5000 miles and that the vehicle is being dismantled. | 20th Oct 1938 | Box 82 \ 1 scan0255 | |
| Telex-style communication to Mr. G.W. Hancock regarding the results of a test on pistons. | 12th Oct 1933 | Box 82 \ 1 scan0256 | |
| 5000-mile engine inspection detailing collapsed piston skirts, including copies of telegrams. | 12th Oct 1933 | Box 82 \ 1 scan0257 | |
| And sketch detailing wear patterns on gudgeon pin pads and cylinder walls. | 12th Oct 1933 | Box 82 \ 1 scan0258 | |
| Telegram reporting the collapse of pistons number four, five, and six on the skirt. | 12th Oct 1935 | Box 82 \ 1 scan0259 | |
| Dispatch of an exhaust system and jacking pads to France. | 13th Oct 1933 | Box 82 \ 1 scan0260 | |
| Telegram to Mr. G.W. Hancock in France regarding new car pistons. | 14th Oct 1923 | Box 82 \ 1 scan0261 | |
| Telegram confirming a car has resumed running. | 14th Oct 1935 | Box 82 \ 1 scan0262 | |
| Bentley car test in France, discussing a piston knock and road-holding performance issues. | 14th Oct 1933 | Box 82 \ 1 scan0263 | |
| Report on a Bentley 1V after 5,000 miles, regarding the need to send out replacement pistons. | 16th Oct 1933 | Box 82 \ 1 scan0264 | |
| 5000-mile test report on I.B. IV, detailing engine performance, oil consumption, and piston knock issues. | 13th Oct 1933 | Box 82 \ 1 scan0265 | |
| Inspection report detailing the condition of engine and fuel system components, including valves, carburettors, and pumps. | 13th Oct 1933 | Box 82 \ 1 scan0266 | |
| The performance and condition of various engine and cooling system components. | 13th Oct 1933 | Box 82 \ 1 scan0267 | |
| Performance and issues with rear engine mountings, flywheel, clutch, exhaust system, pedals, and steering. | 13th Oct 1933 | Box 82 \ 1 scan0268 | |
| The condition of pivot pins, front axle, brakes, propeller shaft, rear brakes, and petrol tank. | 13th Oct 1933 | Box 82 \ 1 scan0269 | |
| Performance of hydraulic dampers, front control arms, rear axle, and electrical equipment. | 13th Oct 1933 | Box 82 \ 1 scan0270 | |
| Hand-drawn sketch of a 'Side Steering Tube' with dimensional annotations and notes. | 16th Oct 1933 | Box 82 \ 1 scan0271 | |
| Message to G.W. Hancock in France requesting the return of a car as soon as possible. | 16th Oct 1933 | Box 82 \ 1 scan0272 | |
| Telegram reporting a broken connecting rod that has come through the engine case. | 9th Oct 1921 | Box 82 \ 1 scan0273 | |
| Telegram reporting a gudgeon pin boss failure and subsequent connecting rod breakage. | 30th Oct 1916 | Box 82 \ 1 scan0274 | |
| Catastrophic engine failure caused by a broken connecting rod and gudgeon pin. | 16th Oct 1933 | Box 82 \ 1 scan0275 | |
| Field report detailing an engine breakdown and subsequent repairs in Chateauroux, France. | 17th Oct 1933 | Box 82 \ 1 scan0276 | |
| Telegram from Hancock confirming that an engine repair is being expedited. | 17th Oct 1933 | Box 82 \ 1 scan0277 | |
| Return of springs for Chassis I-B-IV. | 23th Oct 1933 | Box 82 \ 1 scan0278 | |
| Piston failure in a 3 1/2 Litre Bentley after testing in France. | 20th Oct 1933 | Box 82 \ 1 scan0279 | |
| The cause of 3½ Litre Bentley piston failures and proposed solutions with an external supplier. | 26th Oct 1933 | Box 82 \ 1 scan0280 | |
| The condition of a rear axle after being stripped for examination following a 16,000-mile test run. | 24th Nov 1933 | Box 82 \ 1 scan0281 | |
| Inspection report detailing issues found in a differential and axle shafts, including part analysis and suggestions for improvement. | 24th Nov 1933 | Box 82 \ 1 scan0282 | |
| The commencement of a 10,000-mile test on a 3 1/2 Litre Bentley, focusing on new pistons and a petrol pump. | 20th Nov 1933 | Box 82 \ 1 scan0283 | |
| Test drive report from Chateauroux, France, detailing vehicle performance issues including vibration, acceleration, and suspension. | 22th Nov 1933 | Box 82 \ 1 scan0284 | |
| Letter to Mr. G.W. Hancock discussing vehicle performance, including steering, pistons, oil suitability, and tyre complaints. | 25th Nov 1933 | Box 82 \ 1 scan0285 | |
| Typed memorandum with a diagram, discussing unusual inner tyre tread wear and proposed solutions. | 25th Nov 1933 | Box 82 \ 1 scan0286 | |
| Radiator shutters and comparing them to the Phantom model. | 27th Nov 1933 | Box 82 \ 1 scan0287 | |
| To G.W. Hancock regarding a complaint about mud getting onto the engine of trials cars. | 27th Nov 1933 | Box 82 \ 1 scan0288 | |
| Questioning the effect of a higher geared back axle on a 10,000-mile piston test for a Bentley car. | 28th Nov 1933 | Box 82 \ 1 scan0289 | |
| Axle ratio for the Bentley 1. B.IV. 10,000 Miles Test in relation to engine over-revving and piston failure. | 29th Nov 1933 | Box 82 \ 1 scan0290 | |
| Telegram confirming that the examination of 5000 pistons was completed successfully. | 2nd Nov 1929 | Box 82 \ 1 scan0291 | |
| Radiator shutters not remaining fully open at speed during a Bentley 10,000 Mile Test. | 29th Nov 1933 | Box 82 \ 1 scan0292 | |
| 5000-mile road test report covering engine cleanliness, tyre wear comparison, and starting performance. | 29th Nov 1933 | Box 82 \ 1 scan0293 | |
| Thermostat and radiator shutter modifications, and the results of a piston examination after 5000 miles. | 4th Dec 1933 | Box 82 \ 1 scan0294 | |
| Responding to daily test reports discussing issues with radiator shutters, steering, clutch, and tyres. | 4th Dec 1933 | Box 82 \ 1 scan0295 | |
| Letter to G.W. Hancock regarding two new carburetter needles and a request for feedback on performance and petrol consumption. | 5th Dec 1933 | Box 82 \ 1 scan0296 | |
| Query sent to Mr. G.W. Hancock clarifying the amount of oil added to a set of four dampers. | 6th Dec 1933 | Box 82 \ 1 scan0297 | |
| Standard axle ratio for different Bentley body types, particularly open versus closed bodies. | 6th Dec 1933 | Box 82 \ 1 scan0298 | |
| Telegram from Chateauroux to Derby reporting on the condition of pistons and clutch wear. | 13th Jul 1920 | Box 82 \ 1 scan0299 | |
| Telegram to Mr. Hancock in France with instructions following a 5000-mile test. | 7th Dec 1933 | Box 82 \ 1 scan0300 | |
| Bentley 10,000 miles test on radiator shutters and proposed improvements. | 7th Dec 1933 | Box 82 \ 1 scan0301 | |
| Instructions to a test driver regarding a further 5000-mile car test and its return to Derby. | 8th Dec 1933 | Box 82 \ 1 scan0302 | |
| Testing Bentley radiator shutters which are failing to open in cold weather conditions. | 8th Dec 1933 | Box 82 \ 1 scan0303 | |
| 10,000-mile vehicle test, detailing thermostat issues, engine performance, and front tyre wear. | 6th Dec 1933 | Box 82 \ 1 scan0304 | |
| Diagram illustrating the stages of wear on front tyres over mileage. | 7th Dec 1933 | Box 82 \ 1 scan0305 | |
| Piston and clutch examination after a 10,000-mile test, detailing wear and corrective actions. | 7th Dec 1933 | Box 82 \ 1 scan0306 | |
| Progress report on vehicle testing and adjustments after a mileage run. | 9th Dec 1933 | Box 82 \ 1 scan0307 | |
| To G.W. Hancock requesting feedback on experimental engine features after a 10,000-mile test. | 9th Dec 1933 | Box 82 \ 1 scan0308 | |
| Letter arranging a timed speed test at Montlhery for a streamlined car and discussing the return of tyres for inspection. | 11th Dec 1933 | Box 82 \ 1 scan0309 | |
| Covering memo for a report on vehicle 1.B.IV after 10,000 miles of running in France. | 11th Dec 1933 | Box 82 \ 1 scan0310 | |
| 10,000-mile report on I.B.IV., detailing engine and piston performance. | 9th Dec 1933 | Box 82 \ 1 scan0311 | |
| Inspection report on the condition of engine components including connecting rods, cylinders, valves, and valve springs. | 9th Dec 1933 | Box 82 \ 1 scan0312 | |
| The performance of S.U. carburettors, a Chrysler-type fan, and various ignition plugs. | 9th Dec 1933 | Box 82 \ 1 scan0313 | |
| The performance and issues observed with the flywheel, clutch, and clutch pedal. | 9th Dec 1933 | Box 82 \ 1 scan0314 | |
| The performance of the Gear Box, Servo, Propellor Shaft, and Exhaust System. | 9th Dec 1933 | Box 82 \ 1 scan0315 | |
| The performance and issues of various vehicle components including the exhaust, steering, radiator, and bonnet. | 9th Dec 1933 | Box 82 \ 1 scan0316 | |
| Observations on engine side trays, undersheets, front axle performance, and brake issues. | 9th Dec 1933 | Box 82 \ 1 scan0317 | |
| Inspection report detailing the condition and performance of the rear axle, brakes, petrol tank, and road springs. | 9th Dec 1933 | Box 82 \ 1 scan0318 | |
| Performance and condition report on road springs, hydraulic dampers, dynamo, and starter motor. | 9th Dec 1933 | Box 82 \ 1 scan0319 | |
| The performance and preference for the stop lamp switch, ignition, petrol pumps, and dipping light control. | 9th Dec 1933 | Box 82 \ 1 scan0320 | |
| The performance and issues with headlamps, battery, petrol filter, and wing stays, including vehicle weight and consumption figures. | 9th Dec 1933 | Box 82 \ 1 scan0321 | |
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