| Description | Date | Identifier | |
| List of vehicle parts with anticipated weight savings and associated remarks. | 1st Feb 1935 | Box 82 \ 3 scan0170 | |
| Table outlining anticipated weight savings for various vehicle components, including remarks on design requirements. | 1st Apr 1935 | Box 82 \ 3 scan0171 | |
| Analysis of weight changes for parts on a 10,000 miles Bentley, showing increase and decrease in pounds and ounces. | 1st Apr 1935 | Box 82 \ 3 scan0172 | |
| Table comparing standard and new weights of various car components, detailing weight increases and decreases. | 3rd Apr 1935 | Box 82 \ 3 scan0173 | |
| Propeller shaft vibration caused by a fouling nut on the Hardy Spicer coupling flange. | 8th Apr 1935 | Box 82 \ 3 scan0174 | |
| Pencil sketch of a circular mechanical component highlighting a fouling issue. | 8th Apr 1935 | Box 82 \ 3 scan0175 | |
| Pencil sketch of a universal joint assembly with a handwritten note about a fouling issue. | 7th Apr 1935 | Box 82 \ 3 scan0176 | |
| Performance test results from the Montlhéry track, including lap speeds and acceleration times. | 7th Apr 1935 | Box 82 \ 3 scan0177 | |
| Acceleration timings from a standing start to 80 MPH. | 8th Apr 1935 | Box 82 \ 3 scan0178 | |
| Letter discussing vehicle performance issues and further testing requirements for a car at Monthlery. | 8th Apr 1935 | Box 82 \ 3 scan0179 | |
| Delayed arrival of Tonic XL oil at Chateauroux. | 8th Apr 1935 | Box 82 \ 3 scan0180 | |
| List of mechanical adjustments and corrections performed on a vehicle. | 9th Apr 1935 | Box 82 \ 3 scan0181 | |
| Typed report detailing a list of vehicle inspections and rectifications, page 2. | 9th Apr 1935 | Box 82 \ 3 scan0182 | |
| Request to despatch Rudge Wire Wheels and India Covers with tubes to a customer in France. | 9th Apr 1935 | Box 82 \ 3 scan0183 | |
| Telegram reporting a broken steel fan blade and radiator damage, requiring replacement parts. | 10th Apr 1935 | Box 82 \ 3 scan0184 | |
| Responding to criticisms about a car's performance, specifically engine roughness and front spring issues during testing in France. | 10th Apr 1935 | Box 82 \ 3 scan0185 | |
| Page 2 of a road test report discussing engine vibrations, clutch pedal issues, and propeller adjustments. | 10th Apr 1935 | Box 82 \ 3 scan0186 | |
| Fan blade and bracket failure which caused damage to the radiator matrix. | 10th Apr 1935 | Box 82 \ 3 scan0187 | |
| Sent from France detailing a temporary radiator repair and the implications of a missing fan. | 11th Apr 1935 | Box 82 \ 3 scan0188 | |
| Criticism of the road springs on the 10,000 Miles Bentley 5-B-IV. | 12th Apr 1935 | Box 82 \ 3 scan0189 | |
| Letter addressing issues with a radiator fan, engine revs, and road springs on a car. | 12th Apr 1935 | Box 82 \ 3 scan0190 | |
| Troubleshooting steps for steering shocks, brake drums, and a crankshaft period. | 12th Apr 1935 | Box 82 \ 3 scan0191 | |
| Report from France detailing multiple vehicle failures, including brake shudder and broken components, during road testing. | 12th Apr 1935 | Box 82 \ 3 scan0192 | |
| Sketch of a damaged 'off & near side' bracket and associated components, with notes detailing the damage. | 12th Apr 1935 | Box 82 \ 3 scan0193 | |
| Sketch of a brake anchorage plate that has been stripped and seized. | 12th Apr 1935 | Box 82 \ 3 scan0194 | |
| Hand-drawn diagram illustrating damage to an O.S. Smith's Jackall Jack. | 10th Apr 1935 | Box 82 \ 3 scan0195 | |
| Works order for the despatch of Rudge wire wheels, India covers and tubes to a customer in France. | 10th Apr 1935 | Box 82 \ 3 scan0196 | |
| Requesting larger pulleys to carry out fan destruction tests after a previous fan failure. | 11th Apr 1935 | Box 82 \ 3 scan0197 | |
| Telegram received by telephone reporting on vehicle damage. | 12th Apr 1935 | Box 82 \ 3 scan0198 | |
| Telegram reporting extensive damage to a vehicle's front axle, steering, and engine components. | 12th Apr 1935 | Box 82 \ 3 scan0199 | |
| Telegrams from Hancock reporting a broken steel fanblade and radiator damage, and confirmation that replacement parts have been despatched. | 13th Apr 1935 | Box 82 \ 3 scan0200 | |
| Telegram reporting a broken fan blade, bracket, and radiator matrix, and requesting new parts. | 10th Apr 1935 | Box 82 \ 3 scan0201 | |
| Telegram received by telephone regarding a temporary radiator repair. | 12th Apr 1935 | Box 82 \ 3 scan0202 | |
| Typed letter regarding the fitting of a new Radiator Matrix and stronger front springs, along with issues discovered with a fan bracket. | 13th Apr 1935 | Box 82 \ 3 scan0203 | |
| Report from France detailing disastrous test results including brake shudder, a bent steering tube, and a suspected twisted axle. | 14th Apr 1935 | Box 82 \ 3 scan0204 | |
| Letter to G.W. Hancock discussing issues with water excluders and engine periods on a test car. | 15th Apr 1935 | Box 82 \ 3 scan0205 | |
| Feedback and criticism of road springs on a 10,000 Miles Bentley. | 15th Apr 1935 | Box 82 \ 3 scan0206 | |
| Axle modifications, friction disc adjustments, and subsequent road test results from France. | 16th Apr 1935 | Box 82 \ 3 scan0207 | |
| Performance and issues of a modified Bentley car, focusing on suspension, engine, steering, brakes, and crankshaft damper. | 17th Apr 1935 | Box 82 \ 3 scan0208 | |
| The design and performance issues of engine damper springs and friction plates. | 18th Apr 1935 | Box 82 \ 3 scan0209 | |
| Letter discussing modifications to suspension and steering to improve ride quality and fix brake issues. | 18th Apr 1935 | Box 82 \ 3 scan0210 | |
| The failure of a clutch, intermediate silencer, and front axle during a run in France. | 18th Apr 1935 | Box 82 \ 3 scan0211 | |
| Report from France detailing failures of a front axle, clutch, and crankshaft damper during testing. | 19th Apr 1935 | Box 82 \ 3 scan0212 | |
| Test report on a car's clutch, steering, and springing performance with different leaf springs. | 21th Apr 1935 | Box 82 \ 3 scan0213 | |
| Sketches of broken front and rear plates of a Borg & Beck clutch. | 18th Apr 1935 | Box 82 \ 3 scan0214 | |
| Road test results following the fitting of a new clutch and wheels. | 22th Apr 1935 | Box 82 \ 3 scan0215 | |
| Correspondence to G.W. Hancock regarding the supply and testing of various experimental parts, including springs, a crankshaft damper, and an exhaust system. | 24th Apr 1935 | Box 82 \ 3 scan0216 | |
| Query regarding the readiness of a large air-cooled dynamo for trial on 5-B-IV. | 25th Apr 1935 | Box 82 \ 3 scan0217 | |
| Note describing an attached power curve for Unit B-10 after a 10,000-mile run in a 5-B-IV car. | 25th Apr 1935 | Box 82 \ 3 scan0218 | |
| Performance comparison graph of different Bentley cylinder head configurations. | 30th Jan 1935 | Box 82 \ 3 scan0219 | |
| Steering and suspension tests, comparing thick leaf springs to a different scheme which could not be fitted. | 25th Apr 1935 | Box 82 \ 3 scan0220 | |
| Outlining the parameters for a 10,000-mile car test in France, focusing on tappet clearance, valve performance, cooling, and fan blades. | 26th Apr 1935 | Box 82 \ 3 scan0221 | |
| Letter discussing springs, dampers, servo squeaks, and brake performance. | 26th Apr 1935 | Box 82 \ 3 scan0222 | |
| Modification to an expansion box and the urgent need for a replacement for the 5-B-IV exhaust system. | 26th Apr 1935 | Box 82 \ 3 scan0223 | |
| Requesting clarification on non-standard parts fitted to a test car in France. | 26th Apr 1935 | Box 82 \ 3 scan0224 | |
| Non-standard and standard parts fitted to car 5-B-IV for testing in France, including the clutch and road springs. | 29th Apr 1935 | Box 82 \ 3 scan0225 | |
| Short memo confirming arrival in Paris to continue with tests. | 30th Apr 1935 | Box 82 \ 3 scan0226 | |
| Engine valve clearance adjustments and a summary of connecting rod bearing conditions. | 30th Apr 1935 | Box 82 \ 3 scan0227 | |
| The condition of a vehicle's cylinder head, ignition plugs, and radiator following a test. | 30th Apr 1935 | Box 82 \ 3 scan0228 | |
| Return of a radiator matrix for chassis 5-B-IV. | 1st May 1935 | Box 82 \ 3 scan0229 | |
| Diagram of a front axle for a Bentley chassis, showing angle values. | 17th Apr 1935 | Box 82 \ 3 scan0230 | |
| Vehicle modifications, handling improvements, and performance testing on the Montlhéry track. | 1st May 1935 | Box 82 \ 3 scan0231 | |
| Engine performance and acceleration tests, comparing different configurations and cylinder heads. | 1st May 1935 | Box 82 \ 3 scan0232 | |
| Telex from Robotham to Hancock Francobrit regarding car specifications for a standard size induction pipe and a lapped Brooklands head. | 2nd May 1935 | Box 82 \ 3 scan0233 | |
| Letter discussing top speed figures and the performance impact of different engine components like high compression heads and Aerolite pistons. | 2nd May 1935 | Box 82 \ 3 scan0234 | |
| Comparative test results for a standard Bentley at Montlhery Track comparing high compression and standard cylinder heads. | 2nd May 1935 | Box 82 \ 3 scan0235 | |
| Performance test report for a standard head engine with the cut-out open. | 2nd May 1935 | Box 82 \ 3 scan0236 | |
| Outstanding design points for the 15,000 Miles Cars program, covering both Rolls-Royce and Bentley models. | 3rd May 1935 | Box 82 \ 3 scan0237 | |
| Brake shoe modifications and tests, and updates on the Spectre car. | 3rd May 1935 | Box 82 \ 3 scan0238 | |
| Car performance tests, comparing petrol types, and track results. | 4th May 1935 | Box 82 \ 3 scan0239 | |
| Completion of vehicle tests and modifications before proceeding to Châteauroux. | 4th May 1935 | Box 82 \ 3 scan0240 | |
| Typed memorandum detailing vehicle performance tests and adjustments in response to a telegram. | 3rd May 1935 | Box 82 \ 3 scan0241 | |
| From Châteauroux, France, regarding adjustments to the crankshaft damper and front springs. | 5th May 1935 | Box 82 \ 3 scan0242 | |
| Letter discussing the performance of high compression cylinder heads, engine roughness, and the effect of petrol quality. | 7th May 1935 | Box 82 \ 3 scan0243 | |
| Engine performance gains from a high compression head and comparing different car models. | 7th May 1935 | Box 82 \ 3 scan0244 | |
| Graph comparing the Road Wheels Brake Horsepower required to drive Standard and Streamline cars at various speeds. | 7th May 1935 | Box 82 \ 3 scan0245 | |
| Field report from France detailing issues with an exhaust pipe and suspension components. | 7th May 1935 | Box 82 \ 3 scan0246 | |
| Letter to a customer regarding testing new exhaust, cooling, and steering components on their car. | 8th May 1935 | Box 82 \ 3 scan0247 | |
| Test report on hydraulic damper adjustments, ride quality, and an engine cylinder head issue. | 8th May 1935 | Box 82 \ 3 scan0248 | |
| Requesting an opportunity for Park Ward & Co. to inspect the body of experimental car 5-B-1V upon its return from France. | 8th May 1935 | Box 82 \ 3 scan0249 | |
| Telegram from Chateauroux to Derby requesting a near side brake drum with axle. | 2nd May 1935 | Box 82 \ 3 scan0250 | |
| Letter reporting a broken front axle on a car during testing in France, with a handwritten note requesting comparison parts. | 9th May 1935 | Box 82 \ 3 scan0251 | |
| A reduction in the sectional thickness of pivots compared to the standard part. | 9th May 1935 | Box 82 \ 3 scan0252 | |
| Modifying pivot drawings to increase section strength following a failure. | 10th May 1935 | Box 82 \ 3 scan0253 | |
| Request for a replacement straight-through exhaust pipe to be made in Staybrite steel after the original mild steel version burnt out during a 10,000-mile test. | 10th May 1935 | Box 82 \ 3 scan0254 | |
| Return of a broken Stub Axle for Chassis 5-B-IV. | 10th May 1935 | Box 82 \ 3 scan0255 | |
| Technical letter to G.W. Hancock discussing crankshaft periods, flywheel inertia, and timing gear noise reduction. | 10th May 1935 | Box 82 \ 3 scan0256 | |
| Letter discussing modifications to damping and road holding, dispatch of new parts, and arranging a test drive. | 10th May 1935 | Box 82 \ 3 scan0257 | |
| Status update on the detail drawings for the Bentley and Spectre 15,000 miles trials cars. | 10th May 1935 | Box 82 \ 3 scan0258 | |
| B. IV. Bentley engine's performance and modifications after a 7,000-mile test in France. | 11th May 1935 | Box 82 \ 3 scan0259 | |
| Performance data sheet detailing lap speeds, acceleration times, and engine temperatures under various test conditions. | 11th May 1935 | Box 82 \ 3 scan0260 | |
| Performance test results comparing high compression and standard cylinder heads with different induction pipes. | 11th May 1935 | Box 82 \ 3 scan0261 | |
| The performance and condition of a clutch, crankshaft, connecting rod bearings, and timing gears. | 11th May 1935 | Box 82 \ 3 scan0262 | |
| The performance and condition of various vehicle components, including the oil pump, starter motor, and dynamo. | 11th May 1935 | Box 82 \ 3 scan0263 | |
| Testing and modifications for the fan, petrol pumps, and chassis components. | 11th May 1935 | Box 82 \ 3 scan0264 | |
| Test results and issues found with braking systems, axle control, and engine mountings. | 11th May 1935 | Box 82 \ 3 scan0265 | |
| The performance and issues of various vehicle components, including the brake pedal, gearbox, and axle. | 11th May 1935 | Box 82 \ 3 scan0266 | |
| Test report detailing issues and modifications on brakes, jacks, bodywork, exhaust, and radiator systems. | 11th May 1935 | Box 82 \ 3 scan0267 | |
| Report page detailing observations on a propeller shaft, wheels, petrol tank, tool kit, and other components. | 11th May 1935 | Box 82 \ 3 scan0268 | |
| Technical report detailing observations and issues with various vehicle components. | 11th May 1935 | Box 82 \ 3 scan0269 | |
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