| Description | Date | Identifier | |
| Telegram from Chateauroux reporting a broken front shock damper case. | 24th Oct 1928 | Box 11 \ 2 02-page112 | |
| Telegram reporting mileage covered during a test, signed by Hancock. | 25th Oct 1929 | Box 11 \ 2 02-page113 | |
| Telegram from Chateauroux reporting a car is held up to fit a silencer pipe and attend to the clutch, including mileage details. | 28th Dec 1928 | Box 11 \ 2 02-page114 | |
| Telegram reporting on vehicle performance, mileage, and clutch status. | 28th Dec 1928 | Box 11 \ 2 02-page115 | |
| Telegram reporting the successful arrival and performance of a 'Twenty' model car in Chateauroux. | 2nd Sep 1929 | Box 11 \ 2 02-page116 | |
| Typed report on broken front wing stays on a 20 HP vehicle after significant mileage. | 1st Jan 1929 | Box 11 \ 2 02-page117 | |
| Requesting a new exhaust manifold for 'SS' Hancock, including mileage data. | 2nd Jan 1929 | Box 11 \ 2 02-page118 | |
| Typed telegram message regarding vehicle testing status for car 18-EX and a 20 HP vehicle. | 4th Jan 1929 | Box 11 \ 2 02-page119 | |
| Cover page for a 10,000-mile test conducted in France on the 1st 'SS', 18-EX and 19+EX experimental models. | 10th May 1931 | Box 11 \ 2 02-page120 | |
| Telegram reporting on vehicle status and requesting urgent dispatch of spare parts. | 10th May 1931 | Box 11 \ 2 02-page121 | |
| Telegram detailing dynamo output requirements and a request for various car parts. | 8th Jun 1922 | Box 11 \ 2 02-page122 | |
| Letter to Mr. Hancock regarding work on a vehicle being halted due to severe winter weather. | 16th Feb 1929 | Box 11 \ 2 02-page123 | |
| Progress report on vehicle repairs, discussing oil drip tests, gearbox oil leaks, and a request for further instructions. | 16th Feb 1929 | Box 11 \ 2 02-page124 | |
| Accompanying reports on car 19EX, detailing tests and inspections affected by cold weather. | 16th Feb 1929 | Box 11 \ 2 02-page125 | |
| Test report detailing the investigation and rectification of oil leaks from the Gear Box and Servo unit. | 16th Feb 1929 | Box 11 \ 2 02-page126 | |
| The inspection of a gearbox oil leak, servo, and brake system condition. | 16th Feb 1929 | Box 11 \ 2 02-page127 | |
| Report detailing the condition of a vehicle's brakes and tyres after testing. | 6th Feb 1929 | Box 11 \ 2 02-page128 | |
| Investigations into braking, oil loss, and engine issues on car 19 EX. | 6th Feb 1929 | Box 11 \ 2 02-page129 | |
| Letter to Mr. Royce regarding the investigation and re-erection of car 16-EX. | 26th Jan 1929 | Box 11 \ 2 02-page130 | |
| Secret internal memo regarding the testing and modification program for the 21-EX chassis. | 7th Feb 1929 | Box 11 \ 2 02-page131 | |
| Status update on the testing and modification of 'SS' experimental chassis. | 24th Jan 1929 | Box 11 \ 2 02-page132 | |
| Chassis moment of inertia, cold weather starter performance, exhaust noise reduction, and chassis bump tests. | 24th Jan 1929 | Box 11 \ 2 02-page133 | |
| Carburation performance in cold weather, comparing the SS model to the Phantom and testing a Silver Ghost thermostat. | 17th Dec 1928 | Box 11 \ 2 02-page134 | |
| Car's performance after a run, detailing a bent sub-frame, poor speed, and requesting special oil. | 17th Dec 1928 | Box 11 \ 2 02-page135 | |
| The dispatch of a Super Sports car from Derby for inspection by Mr. Royce. | 12th Dec 1928 | Box 11 \ 2 02-page136 | |
| Running and mileage schedule for vehicle 18-EX from December to January. | 17th Dec 1928 | Box 11 \ 2 02-page137 | |
| The conditions for a 10,000-mile test, referencing a past fatal accident involving sales officials. | 17th Dec 1928 | Box 11 \ 2 02-page138 | |
| Arrangements for shipping car 'SS' 18-EX to France. | 6th Dec 1928 | Box 11 \ 2 02-page139 | |
| Improvements and ongoing tests on the 21-EX car, including issues with engine feet, frame twisting, and exhaust noise. | 27th Feb 1929 | Box 11 \ 2 02-page140 | |
| Noise issues, specifically engine mounting and booming, and plans for further testing of car 21-EX in France. | 20th Feb 1929 | Box 11 \ 2 02-page141 | |
| List of parts to be fitted to the 21-EX car chassis before testing. | 20th Feb 1929 | Box 11 \ 2 02-page142 | |
| Continuation list of vehicle component modifications and updates. | 2nd Feb 1929 | Box 11 \ 2 02-page143 | |
| Delay in the readiness of the 'SS' car for sales trials in France. | 2nd Feb 1929 | Box 11 \ 2 02-page144 | |
| Cover page for the second 10,000 miles test on 'SS' 19EX. | 17th Jan 1929 | Box 11 \ 2 02-page145 | |
| Telegram from Châteauroux, France, reporting a single failure on a 20 HP car test. | 17th Jan 1929 | Box 11 \ 2 02-page146 | |
| Cover page for the 3rd 10,000-mile test conducted in France on 'SS' chassis. | 13th Mar 1929 | Box 11 \ 2 02-page147 | |
| Telegram received by telephone regarding delaying a car until a production scheme is recommended. | 13th Mar 1929 | Box 11 \ 2 02-page148 | |
| Telegram from Hives to Robotham regarding the responsibility of a production decision. | 13th Mar 1929 | Box 11 \ 2 02-page149 | |
| Delay in modifications to an 'SS' car intended for France. | 14th Mar 1929 | Box 11 \ 2 02-page150 | |
| Letter with instructions for fitting a new Bijur Pump to car 22-EX and modifying the lubrication system for a 10,000 miles test. | 25th Mar 1929 | Box 11 \ 2 02-page151 | |
| Instructions on vehicle lubrication schedules for axles and the use of Castrol R. | 30th Mar 1929 | Box 11 \ 2 02-page152 | |
| 250-mile road trip and subsequent investigation into issues with shock dampers, a telegauge, and the starter motor. | 30th Mar 1929 | Box 11 \ 2 02-page153 | |
| Mechanical condition and various faults found on a car following an examination. | 28th Mar 1929 | Box 11 \ 2 02-page154 | |
| Test report detailing issues with shock dampers, wheel fouling, gear changes, and a jammed throttle, page 2 of 2. | 27th Jul 1935 | Box 11 \ 2 02-page155 | |
| Investigation into an oil leak from the rear shock dampers and a starter meter failure. | 29th Mar 1929 | Box 11 \ 2 02-page156 | |
| 10,000-mile test detailing a starter motor pinion failure, brake adjustments, and oil supply status. | 29th Mar 1929 | Box 11 \ 2 02-page157 | |
| Issues with rear shock dampers and a starter motor during vehicle testing. | 31th Mar 1929 | Box 11 \ 2 02-page158 | |
| Modification to rear shock damper connecting links to improve oil flow. | 31th Mar 1929 | Box 11 \ 2 02-page159 | |
| Letter discussing issues with steering, shock dampers, and cutout controls. | 3rd Apr 1929 | Box 11 \ 2 02-page160 | |
| Report page discussing faults with drip plugs, a silencer pipe, spring drive, and a petrol gauge. | 3rd Apr 1929 | Box 11 \ 2 02-page161 | |
| Investigation report into engine oil leaks, starter motor failure, and shock damper modifications. | 3rd Apr 1929 | Box 11 \ 2 02-page162 | |
| Various mechanical faults and proposed remedies on a vehicle under test. | 4th Apr 1929 | Box 11 \ 2 02-page163 | |
| Letter regarding troubleshooting issues with the Bijur central lubrication system. | 5th Apr 1929 | Box 11 \ 2 02-page164 | |
| Letter concerning the failure of a starter motor and issues with the Bijur system on a 22-EX car. | 6th Apr 1929 | Box 11 \ 2 02-page165 | |
| Investigations into oil pressure loss and a malfunctioning petrol gauge. | 6th Apr 1929 | Box 11 \ 2 02-page166 | |
| Issues and observations on a return spring, shock dampers, exhaust, lubrication system, and slipper wheel. | 6th Apr 1929 | Box 11 \ 2 02-page167 | |
| Concluding page of a report investigating the cause of lead increasing in slipper wheels. | 6th Apr 1929 | Box 11 \ 2 02-page168 | |
| Sketches illustrating a fuel system, gauge, and control mechanism. | 6th Apr 1929 | Box 11 \ 2 02-page169 | |
| Short memo clarifying the cause of a starter meter failure, referencing previous correspondence. | 6th Apr 1929 | Box 11 \ 2 02-page170 | |
| From G.W.H. concerning the delivery of Mr Royce's luggage and the subsequent examination of the car. | 7th Apr 1929 | Box 11 \ 2 02-page171 | |
| Letter discussing modifications to hydraulic dampers to eliminate knocking sounds during testing. | 8th Apr 1929 | Box 11 \ 2 02-page172 | |
| Alterations to damper loading by fitting different washers to improve ride quality. | 8th Apr 1929 | Box 11 \ 2 02-page173 | |
| Damper arrangements, steering shocks, and a petrol gauge report. | 9th Apr 1929 | Box 11 \ 2 02-page174 | |
| Faults found with a car's Bijur lubrication system, front shock damper, and a rubbing crank pinion. | 9th Apr 1929 | Box 11 \ 2 02-page175 | |
| Disconcerting results from a 10,000-mile test of the 'SS' model, highlighting various mechanical faults. | 9th Apr 1929 | Box 11 \ 2 02-page176 | |
| Telegram from Hancock to Hives reporting a broken front shock damper casing and requesting a new one. | 10th Apr 1929 | Box 11 \ 2 02-page177 | |
| The issues arising from the 10,000-mile test of the 22-EX car, including engine, steering, and starter motor faults. | 10th Apr 1929 | Box 11 \ 2 02-page178 | |
| Progress on the 21-EX and 22-MX car models. | 10th Apr 1929 | Box 11 \ 2 02-page179 | |
| Car instability issues due to broken shock dampers and unresolved problems with the slipper drive. | 10th Apr 1929 | Box 11 \ 2 02-page180 | |
| Letter regarding a front shock absorber failure and requesting steering experiments for the 22-EX car. | 10th Apr 1929 | Box 11 \ 2 02-page181 | |
| Steering, shock absorbers, and propeller shaft joint leaks. | 11th Apr 1929 | Box 11 \ 2 02-page182 | |
| Oil drip rate specifications for D.2, D.1, and D.O. drip plugs. | 11th Apr 1929 | Box 11 \ 2 02-page183 | |
| Letter regarding the dispatch of a complete N.S. front shock absorber with a strengthened case. | 11th Apr 1929 | Box 11 \ 2 02-page184 | |
| Letter responding to a complaint about grabbing brakes, suggesting a fix by soaking the cotton duck lining in oil. | 11th Apr 1929 | Box 11 \ 2 02-page185 | |
| Replacing cotton duck liners with Ferodo liners and the braking effect of different cams. | 14th Apr 1929 | Box 11 \ 2 02-page186 | |
| Mileage tests for coupling joints, slipper wheel, and spring drive. | 14th Apr 1929 | Box 11 \ 2 02-page187 | |
| Letter discussing 'SS' brake distribution issues and potential solutions after a 10,000-mile test in France. | 15th Apr 1929 | Box 11 \ 2 02-page188 | |
| Brake lining materials, servo efficiency, brake proportioning, and steering tube modification. | 15th Apr 1929 | Box 11 \ 2 02-page189 | |
| Continued memorandum page requesting a report on a side steering tube. | 15th Apr 1929 | Box 11 \ 2 02-page190 | |
| Road testing investigations into a front damper, slipper wheel, oil pump, and a 'galloping knock'. | 15th Apr 1929 | Box 11 \ 2 02-page191 | |
| Steering adjustments, damper fitting, and an enquiry regarding a 20 HP vehicle. | 16th Apr 1929 | Box 11 \ 2 02-page192 | |
| Letter detailing adjustments made to the brake servo system to correct an issue of excessive front braking. | 17th Apr 1929 | Box 11 \ 2 02-page193 | |
| Test report on steering and damper modifications, and notes on starter motor issues. | 18th Apr 1929 | Box 11 \ 2 02-page194 | |
| Parts received and issues encountered with a starter bush, shock damper accessibility, and an oil leak. | 18th Apr 1929 | Box 11 \ 2 02-page195 | |
| Road test report detailing the effects of adjusted damper loads on a car's steering and ride quality. | 18th Apr 1929 | Box 11 \ 2 02-page196 | |
| Central lubrication system, specifically the rear axle reservoir, a new pump, and the use of Castrol 'R' oil. | 18th Apr 1929 | Box 11 \ 2 02-page197 | |
| Issues with a starter motor, mechanic's joints, a Telegauge, and suspension performance during vehicle testing. | 19th Apr 1929 | Box 11 \ 2 02-page198 | |
| Listing spare parts being sent out to GWH by messenger. | 19th Apr 1929 | Box 11 \ 2 02-page199 | |
| Letter discussing a report on brakes and steering, detailing an analysis of braking linkage efficiency and a change in brake lining material. | 19th Apr 1929 | Box 11 \ 2 02-page200 | |
| Brake lining performance, servo adjustments, and steering friction issues. | 19th Apr 1929 | Box 11 \ 2 02-page201 | |
| Modifications and testing of steering and suspension components. | 19th Apr 1929 | Box 11 \ 2 02-page202 | |
| Issues from a 10,000 miles' test, including steering, slipper drive, and starter motor problems. | 19th Apr 1929 | Box 11 \ 2 02-page203 | |
| Testing car shock damper settings and ride quality. | 20th Apr 1929 | Box 11 \ 2 02-page204 | |
| Results and issues from a 10,000-mile test on the 22-EX car. | 22th Apr 1929 | Box 11 \ 2 02-page205 | |
| Sending a man to collect parts and requesting a fitter to help replace brake shoes. | 28th Apr 1929 | Box 11 \ 2 02-page206 | |
| Tests carried out on the Telegauge, starter motor, and steering systems. | 23th Apr 1929 | Box 11 \ 2 02-page207 | |
| Test report on rear dampers, detailing issues with knocking, link motion play, a loose ball end, and a bent bracket. | 23th Apr 1929 | Box 11 \ 2 02-page208 | |
| Steering and suspension testing, focusing on tyre performance, damper settings, and spring condition. | 23th Apr 1929 | Box 11 \ 2 02-page209 | |
| Letter regarding the testing of new suspension parts and springs for the 22-EX car in France. | 23th Apr 1929 | Box 11 \ 2 02-page210 | |
| Test procedures for vehicle ballast, buffer clearance, and steering settings. | 24th Apr 1929 | Box 11 \ 2 02-page211 | |
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