| Description | Date | Identifier | |
| Correction of faults on car 18-G4 in France prior to endurance running. | 16th Nov 1931 | Box 5a \ 3 03-page103 | |
| The clutch, front shock dampers, and Wakefield XXL oil for car 18.G.IV. | 17th Nov 1931 | Box 5a \ 3 03-page104 | |
| The maximum speed of 81 M.P.H. achieved by car 18-G4 under favourable conditions. | 18th Nov 1931 | Box 5a \ 3 03-page105 | |
| Letter to G.W. Hancock discussing clutch pedal pressure, gear noise, and other issues on a 25 HP car. | 6th Nov 1931 | Box 5a \ 3 03-page106 | |
| Instructions to monitor brake drum wear, propeller clearance and engine performance with increased ignition advance. | 8th Nov 1931 | Box 5a \ 3 03-page107 | |
| Water temperature issue during a stationary slow running test and questioning the pump's efficiency. | 18th Nov 1931 | Box 5a \ 3 03-page108 | |
| Tests and observations concerning engine mounting, exhaust system, acceleration, crankshaft periods, and a slipper wheel for vehicle 18.G.IV. | 18th Nov 1931 | Box 5a \ 3 03-page109 | |
| Dynamo output readings in amps at various speeds with the lamps on and off. | 18th Nov 1931 | Box 5a \ 3 03-page110 | |
| Request for pilot rear brake shoes for the 25 HP model to be sent out for testing. | 18th Nov 1931 | Box 5a \ 3 03-page111 | |
| From G.W.H in Chateauroux, France, acknowledging instructions regarding Christmas, car mileage, and awaiting further instructions on the car's return. | 18th Nov 1931 | Box 5a \ 3 03-page112 | |
| Letter addressing complaints about the dynamo's battery charging and requesting feedback on a new prototype Lucas wiper. | 18th Nov 1931 | Box 5a \ 3 03-page113 | |
| Letter providing diagnostic advice for issues with water over-heating at low speeds and clutch slip. | 20th Nov 1931 | Box 5a \ 3 03-page114 | |
| Letter concerning clutch spring pressures, pedal leverage, and acceleration figures for a 25 HP vehicle. | 21th Nov 1931 | Box 5a \ 3 03-page115 | |
| Clutch slippage and chatter issues, traced to automatic oiling and bearing problems. | 23th Nov 1931 | Box 5a \ 3 03-page116 | |
| Drawing and note concerning chattering and axial marks on a shaft. | 23th Jan 1931 | Box 5a \ 3 03-page117 | |
| The failure and high-speed inefficiency of a Lucas windscreen wiper, with diagrams. | 23th Nov 1931 | Box 5a \ 3 03-page118 | |
| Recurring slipper knock on a Phantom car, caused by a broken spring drive plate. | 23th Nov 1931 | Box 5a \ 3 03-page119 | |
| Dynamo's output, battery discharge rates, and the inadequacy of headlamp bulbs for night driving. | 23th Nov 1931 | Box 5a \ 3 03-page120 | |
| Troubleshooting on the Phantom model and comparing different wattage headlamp bulbs. | 23th Nov 1931 | Box 5a \ 3 03-page121 | |
| Technical report discussing issues and planned actions for the gearbox, clutch, engine mounting, and front buffers. | 23th Nov 1931 | Box 5a \ 3 03-page122 | |
| Damper filter interference with the side steering tube and a planned brake examination. | 23th Nov 1931 | Box 5a \ 3 03-page123 | |
| Issue with the cross steering tube where tightening bolts traps a brass pad, rendering the spring inoperative. | 23th Nov 1931 | Box 5a \ 3 03-page124 | |
| From Chateauroux, France, detailing findings on a vehicle's clutch, cylinders, petrol gauge, and brake drums. | 24th Nov 1931 | Box 5a \ 3 03-page125 | |
| Maintenance work performed on car 18.G.IV, listing eight completed tasks. | 25th Nov 1931 | Box 5a \ 3 03-page126 | |
| Persistent blowing past the pistons on a 25 HP engine and the trial of new rings. | 26th Nov 1931 | Box 5a \ 3 03-page127 | |
| Findings from vehicle testing on cross steering, Bijur lubrication, engine mounting, gears, and clutch performance. | 26th Nov 1931 | Box 5a \ 3 03-page128 | |
| Lubrication of a front axle, debating the cause of oil leakage and the condition of the parts. | 27th Nov 1931 | Box 5a \ 3 03-page129 | |
| Vehicle performance issues regarding oil, suspension, brakes, spring drive, and gearbox. | 27th Nov 1931 | Box 5a \ 3 03-page130 | |
| Failures with the Bijur lubrication system, an altered exhaust system, and an incident involving low-rated springs. | 27th Nov 1931 | Box 5a \ 3 03-page131 | |
| Car handling characteristics, focusing on skidding, suspension rebound, and tyre grip. | 28th Nov 1931 | Box 5a \ 3 03-page132 | |
| Letter to G.W. Hancock Esq. discussing issues with a car including steering, overheating, lubrication, petrol consumption, and clutch. | 28th Nov 1931 | Box 5a \ 3 03-page133 | |
| Letter regarding the dispatch and testing of a set of inner and outer drive driving springs to eliminate rattles. | 28th Nov 1931 | Box 5a \ 3 03-page134 | |
| Request to swap a 12-toothed axle from vehicle 12-GIV to 20-GIV due to smaller wheels being fitted. | 28th Nov 1931 | Box 5a \ 3 03-page135 | |
| Engine performance issues, specifically piston ring blow-by, oil loss, and crankshaft vibration at high speed. | 28th Nov 1931 | Box 5a \ 3 03-page136 | |
| Cylinder head issues including valve seat distortion, valve spring problems, and an inefficient water pump. | 29th Nov 1931 | Box 5a \ 3 03-page137 | |
| Telegram requesting a replacement front brake equaliser, part number G 53076. | 30th Nov 1930 | Box 5a \ 3 03-page138 | |
| Internal versus external support stays for side spare wheel carriers. | 30th Nov 1931 | Box 5a \ 3 03-page139 | |
| To G.W. Hancock discussing test results and required actions for various car components like the front axle, springs, and crankshaft. | 30th Nov 1931 | Box 5a \ 3 03-page140 | |
| Note about a stuck carburetter air valve, comparing its maintenance to cheaper S.U. models and requesting feedback for improvement. | 30th Nov 1931 | Box 5a \ 3 03-page141 | |
| Issues with valve seat distortion, engine diamond mounting movement, and overheating at low speeds. | 30th Nov 1931 | Box 5a \ 3 03-page142 | |
| Findings on foot brake leverage, radiator mounting, cross steering tube load, and engine lubrication. | 28th Nov 1931 | Box 5a \ 3 03-page143 | |
| Letter to G.W. Hancock requesting verification of an invoice from Paris for items including a new Exide battery. | 1st Dec 1931 | Box 5a \ 3 03-page144 | |
| The fitting of new clutch springs and a note on petrol consumption suggestions. | 1st Dec 1931 | Box 5a \ 3 03-page145 | |
| Issues found during testing related to water temperature, clutch performance, and a knock from the torque reaction damper. | 1st Dec 1931 | Box 5a \ 3 03-page146 | |
| Issues with a spare wheel carrier, petrol consumption test results, and a water pump fault. | 2nd Dec 1931 | Box 5a \ 3 03-page147 | |
| Engine temperature tests and a sticking carburetter air valve. | 2nd Dec 1931 | Box 5a \ 3 03-page148 | |
| Typed letter responding to vehicle issues including overheating, braking, and detonations. | 2nd Dec 1931 | Box 5a \ 3 03-page149 | |
| Knock from the torque reaction damper and clutch lubrication issues during the 18-GIV 10,000-mile test in France. | 31th Dec 1931 | Box 5a \ 3 03-page150 | |
| From PN regarding arrangements for car 18-G4, including a trip to Le Canadel and movements in Paris. | 3rd Dec 1931 | Box 5a \ 3 03-page151 | |
| Investigations into torque reaction dampers, front shock dampers, and gearbox issues. | 3rd Dec 1931 | Box 5a \ 3 03-page152 | |
| Vehicle issues and repairs concerning gears, tyres, valves, speedometer, and electrical systems. | 28th Aug 1916 | Box 5a \ 3 03-page153 | |
| Test results and issues with brakes, detonations, radiator, and exhaust systems. | 4th Dec 1931 | Box 5a \ 3 03-page154 | |
| Letter discussing engine testing on the crankshaft master period and arranging a car trial. | 4th Dec 1931 | Box 5a \ 3 03-page155 | |
| Outlining the testing schedule and logistical arrangements for car 18-G4 in France. | 4th Dec 1931 | Box 5a \ 3 03-page156 | |
| Recurring cracked exhaust manifold issue and a correction to a previous memo. | 5th Dec 1931 | Box 5a \ 3 03-page157 | |
| Suggesting a slight modification to an exhaust system manifold to overcome a problem. | 5th Dec 1931 | Box 5a \ 3 03-page158 | |
| The incomplete state of a vehicle test, its abrupt end, and an issue with a broken exhaust manifold. | 6th Dec 1931 | Box 5a \ 3 03-page159 | |
| Status report on vehicle maintenance issues including stretched studs, brake wear, and damper knocking. | 7th Dec 1931 | Box 5a \ 3 03-page160 | |
| Modifications and repairs carried out on a car in France. | 7th Dec 1931 | Box 5a \ 3 03-page161 | |
| Outlining arrangements for a hamper and car journey to Le Canadel, France. | 7th Dec 1931 | Box 5a \ 3 03-page162 | |
| Issues with the torque re-action damper and clutch oil leakage during a 10,000-mile test in France. | 8th Dec 1931 | Box 5a \ 3 03-page163 | |
| Unsatisfactory steering and a cracked exhaust manifold on a car during a 15,000-mile test in France. | 9th Dec 1931 | Box 5a \ 3 03-page164 | |
| Clarifying a misunderstanding regarding car and driver arrangements in France. | 9th Dec 1931 | Box 5a \ 3 03-page165 | |
| Cover note for a final report on the running of vehicle 18-G-IV after 9,500 miles in France. | 14th Dec 1931 | Box 5a \ 3 03-page166 | |
| The performance and suspension of vehicle 18.G.IV after a 9,500-mile road test, comparing it to a Bugatti. | 14th Dec 1931 | Box 5a \ 3 03-page167 | |
| List of failures and troubles observed on a vehicle up to a mileage of 9,500. | 14th Dec 1931 | Box 5a \ 3 03-page168 | |
| Car performance tests, a component failure, and engine running observations. | 14th Dec 1931 | Box 5a \ 3 03-page169 | |
| Engine consumption tests, observed noises, and a post-mileage inspection of pistons and cylinder heads. | 14th Dec 1931 | Box 5a \ 3 03-page170 | |
| Valve & fitting performance and low inertia spring drive modifications. | 14th Dec 1931 | Box 5a \ 3 03-page171 | |
| Test report detailing findings on various engine components after mileage accumulation. | 14th Dec 1931 | Box 5a \ 3 03-page172 | |
| Modifications and performance of a camshaft, petrol filter, and flywheel/clutch assembly. | 14th Dec 1931 | Box 5a \ 3 03-page173 | |
| The performance and modifications of a clutch, synchro-mesh gearbox, and servo motor mechanism. | 14th Dec 1931 | Box 5a \ 3 03-page174 | |
| Gearbox servo, exhaust, and radiator fitting issues and modifications. | 14th Dec 1931 | Box 5a \ 3 03-page175 | |
| Issues with thermostatically operated shutters, fan belt failure, ignition plugs, and bonnet modifications. | 14th Dec 1931 | Box 5a \ 3 03-page176 | |
| The performance and issues with various vehicle components including the bonnet, steering, propeller shaft, and brakes. | 14th Dec 1931 | Box 5a \ 3 03-page177 | |
| Technical report on the condition and performance of front and rear axles, lubrication systems, and brakes. | 14th Dec 1931 | Box 5a \ 3 03-page178 | |
| Test report on vehicle suspension components, including braking, springs, and dampers. | 14th Dec 1931 | Box 5a \ 3 03-page179 | |
| Performance and issues with dampers, petrol tanks, and gauges. | 14th Dec 1931 | Box 5a \ 3 03-page180 | |
| The performance of spare wheel arrangements and electrical equipment including a wiper, dynamo, and starter motor. | 14th Dec 1931 | Box 5a \ 3 03-page181 | |
| The condition of vehicle components including the dynamo, distributor, battery, clock and bodywork after a mileage test. | 14th Dec 1931 | Box 5a \ 3 03-page182 | |
| Performance data sheet detailing acceleration times, fuel and oil consumption, and tyre mileage. | 14th Dec 1931 | Box 5a \ 3 03-page183 | |
| Table recording cage clearance measurements over various dates. | 28th Jan 1932 | Box 5a \ 3 03-page184 | |
| Performance graph from an accelerator pump test, plotting Boost, RPM, Oil Pressure, and Oil Temperature. | 28th Jan 1932 | Box 5a \ 3 03-page185 | |
| Graph showing vaporisation temperatures from an in-flight engine test at various altitudes. | 20th Oct 1941 | Box 5a \ 3 03-page186 | |
| Graph plotting performance data from a test run with reduced fuel and oil consumption. | 11th Feb 1933 | Box 5a \ 3 03-page187 | |
| Graph showing the results of a test with a long exhaust pipe on an engine. | 25th Nov 1931 | Box 5a \ 3 03-page188 | |
| Letter to G.W. Hancock in France regarding issues with front axle lubrication, brakes, and a gearbox. | 25th Nov 1931 | Box 5a \ 3 03-page189 | |
| Typed letter discussing a concern about the top gear coming out on the over-run in gearboxes. | 16th Dec 1931 | Box 5a \ 3 03-page190 | |
| Inspection report on a C.10 Chassis unit after a 10,000-mile test, detailing the condition of engine components. | 16th Dec 1931 | Box 5a \ 3 03-page191 | |
| Continued vehicle inspection report detailing the condition of engine and chassis components. | 16th Dec 1931 | Box 5a \ 3 03-page192 | |
| Condition report on various chassis components. | 28th Dec 1931 | Box 5a \ 3 03-page193 | |
| Test report on experimental car 18.G.4 after its 10,000-mile test in France. | 28th Dec 1931 | Box 5a \ 3 03-page194 | |
| Page 2 of a vehicle condition report detailing faults with the brakes, clutch, radiator, and electrical systems. | 29th Dec 1931 | Box 5a \ 3 03-page195 | |
| Test driver's impression report on a car's performance after a 60-mile run, detailing issues with various components. | 29th Dec 1931 | Box 5a \ 3 03-page196 | |
| Vehicle component testing, detailing issues with the speedometer and a fouling shock absorber. | 29th Dec 1931 | Box 5a \ 3 03-page197 | |
| 10,000-mile test praising a new car's performance and urging its immediate production. | 1st Dec 1931 | Box 5a \ 3 03-page198 | |
| Driver's report on a car's performance during a 1,000-mile road test in France. | 1st Jan 1932 | Box 5a \ 3 03-page199 | |
| Issues and performance of various vehicle components, including the carburettor, windscreen wipers, and clutch. | 8th Jan 1932 | Box 5a \ 3 03-page200 | |
| The condition of engine 18.G.IV after a 10,000 miles test. | 8th Jan 1932 | Box 5a \ 3 03-page201 | |
| Condition report on various vehicle components including springs, clutch, gearbox, and radiator. | 8th Jan 1932 | Box 5a \ 3 03-page202 | |
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