| Description | Date | Identifier | |
| Vehicle road test findings, covering steering vibration, engine characteristics, clutch, starter motor and steering wheel modifications. | 15th Dec 1928 | Box 65a \ 2 scan0153 | |
| Continued report critiquing steering response, subframe body mounting, and hypoid axle gear ratios. | 18th Dec 1928 | Box 65a \ 2 scan0154 | |
| Production schedule and readiness dates for several experimental chassis and their bodies. | 18th Dec 1928 | Box 65a \ 2 scan0155 | |
| The chassis programme, delivery schedules for bodies, and the Experimental Department's workload. | 19th Dec 1928 | Box 65a \ 2 scan0156 | |
| Secret memo detailing plans for testing and swapping experimental 'SS' cars 19-EX, 18-EX, and 14-EX. | 19th Dec 1928 | Box 65a \ 2 scan0157 | |
| Typed memorandum proposing a programme and schedule for a 10,000-mile vehicle test. | 20th Dec 1928 | Box 65a \ 2 scan0158 | |
| Progress of a 10,000-mile test and modifications for experimental cars 13-EX and 19-EX. | 18th Dec 1928 | Box 65a \ 2 scan0159 | |
| To Mr. Hancock regarding the handover of an SS car for testing and the dispatch of new parts to fix a faulty starter motor. | 21th Dec 1928 | Box 65a \ 2 scan0160 | |
| Faults with a silencer, radiator, clutch, and springs, and the proposed actions to resolve them. | 21th Dec 1928 | Box 65a \ 2 scan0161 | |
| Page 3 of a typed letter discussing car testing, including tyre pressures and spring clips. | 21th Dec 1928 | Box 65a \ 2 scan0162 | |
| Secret memo detailing the logistics and schedule for a 10,000-mile test on the 'SS' car. | 21th Dec 1928 | Box 65a \ 2 scan0163 | |
| Secret memo outlining the arrangements for testing experimental cars 18-EX and 19-EX in France. | 29th Dec 1928 | Box 65a \ 2 scan0164 | |
| Letter to Mr. Hancock in France arranging the handover and examination of experimental cars 18-EX and 19-EX. | 31th Dec 1928 | Box 65a \ 2 scan0165 | |
| Secret internal memorandum requesting information on experimental car models 18.EX and 19.EX before production. | 31th Dec 1928 | Box 65a \ 2 scan0166 | |
| Replying to queries about modifications and testing plans for experimental cars 18-EX to 21-EX. | 1st Jan 1929 | Box 65a \ 2 scan0167 | |
| Wheel alterations and testing plans for experimental cars 19-EX and 20-EX. | 2nd Jan 1929 | Box 65a \ 2 scan0168 | |
| The 8400-mile road test of the 'SS' car, detailing its performance and identified issues. | 2nd Jan 1929 | Box 65a \ 2 scan0169 | |
| Technical issues including an oil leak, a failed fabric coupling, and progress on experimental tests. | 25th Jan 1929 | Box 65a \ 2 scan0170 | |
| Secret memo regarding the length of the 'SG' chassis, referencing previous reports. | 25th Jan 1929 | Box 65a \ 2 scan0171 | |
| Secret memo discussing chassis length and spare wheel configuration for the 'SG' model. | 1st Jan 1929 | Box 65a \ 2 scan0172 | |
| Cover note for a report on the 18-EX 'SS' car after 5,000 miles of a 10,000-mile test in France. | 8th Jan 1929 | Box 65a \ 2 scan0173 | |
| 5,000-mile test report on engine S.S.N° 7, detailing performance, valve clearances, and component checks. | 8th Jan 1929 | Box 65a \ 2 scan0174 | |
| Tests and issues with a vacuum pump, carburetter, water pump, and exhaust manifolds. | 8th Jan 1929 | Box 65a \ 2 scan0175 | |
| Technical report detailing observations on the rocker cover, engine suspension, exhaust system, and exhaust cut-out performance. | 8th Jan 1929 | Box 65a \ 2 scan0176 | |
| Issues and modifications on various vehicle components such as the radiator, shutters, bonnet, and brakes. | 8th Jan 1929 | Box 65a \ 2 scan0177 | |
| Performance and condition of brakes, suspension, steering, and clutch components. | 8th Jan 1929 | Box 65a \ 2 scan0178 | |
| Technical report detailing observations and issues with the clutch, gearbox, and drivetrain components. | 8th Jan 1929 | Box 65a \ 2 scan0179 | |
| Examination report detailing the condition of various vehicle components like brakes, springs, and petrol tank. | 8th Jan 1929 | Box 65a \ 2 scan0180 | |
| Issues with the body subframe, a detailed review of the electrical equipment, and commentary on the bodywork's condition. | 8th Jan 1929 | Box 65a \ 2 scan0181 | |
| Page from a test report detailing car mileage, petrol consumption, weight, and tyre specifications. | 8th Jan 1929 | Box 65a \ 2 scan0182 | |
| Telegram about an agreement to proceed with a new car and suggested modifications. | 8th Jan 1929 | Box 65a \ 2 scan0183 | |
| Faults manifested during the 'SS' development, covering engine and exhaust system issues. | 8th Jan 1929 | Box 65a \ 2 scan0184 | |
| Technical report on deficiencies and modifications for the exhaust, carburation, vacuum pump, clutch, and brakes of the SS model. | 8th Jan 1929 | Box 65a \ 2 scan0185 | |
| Technical report on issues and improvements concerning shock absorbers, fabric couplings, starter motors, and front-end 'jellying' on Phantom and SS cars. | 1st Jan 1929 | Box 65a \ 2 scan0186 | |
| Telegram received concerning proceeding with suggested modifications to the 'New Car Twenty'. | 1st Jan 1929 | Box 65a \ 2 scan0187 | |
| Mounting cost for an experimental saloon body for Mr. Royce and attributing difficulties to Barkers' delinquencies. | 11th Jan 1929 | Box 65a \ 2 scan0188 | |
| Weight of the 18-EX chassis and the complete car. | 14th Jan 1929 | Box 65a \ 2 scan0189 | |
| Secret internal memorandum regarding production priorities for 'SS' material, modification lists, and component supply issues like Hypoid Gears. | 15th Jan 1929 | Box 65a \ 2 scan0190 | |
| Letter concerning a journal account from RR Springfield and an update on the 'SS' Phantom's 10,000-mile test in France. | 15th Jan 1929 | Box 65a \ 2 scan0191 | |
| Arranging for photographs of the 18-EX car to be taken in France. | 15th Jan 1929 | Box 65a \ 2 scan0192 | |
| Date for sending a model car (21-EX) to France and listing its modifications compared to the 18-EX. | 16th Jan 1929 | Box 65a \ 2 scan0193 | |
| Performance improvements and test results for the 'SS' chassis engine. | 16th Jan 1929 | Box 65a \ 2 scan0194 | |
| Completion of work on Phantom car 8-EX and the disposal of its Hooper limousine body. | 17th Jan 1929 | Box 65a \ 2 scan0195 | |
| Modifications to shock dampers, exhaust system, brake leverages, and steering column controls. | 19th Jan 1929 | Box 65a \ 2 scan0196 | |
| Letter to Mr. Elliott concerning the urgency of manufacturing an improved SS car for delivery to France. | 19th Jan 1929 | Box 65a \ 2 scan0197 | |
| Hs. to Sg. concerning a letter from Mr. Beaver and a proposed reply. | 1st Jan 1929 | Box 65a \ 2 scan0198 | |
| Secret letter discussing the development and production schedule for a new SS chassis and car. | 11th Jan 1929 | Box 65a \ 2 scan0199 | |
| Letter discussing production feasibility, delivery timelines, and inter-departmental communication protocols. | 21th Jan 1929 | Box 65a \ 2 scan0200 | |
| Letter to Rolls-Royce America detailing the development progress and advantages of the new 'SS' chassis. | 21th Jan 1929 | Box 65a \ 2 scan0201 | |
| Recommendation to test a new experimental car in the U.S.A. before the end of winter. | 21th Jan 1929 | Box 65a \ 2 scan0202 | |
| Recommendation to send an experimental 'SS' car to the U.S.A. for testing under American conditions. | 21th Jan 1929 | Box 65a \ 2 scan0203 | |
| Letter to Rolls-Royce America detailing the progress and advantages of the new 'SS' chassis. | 21th Jan 1929 | Box 65a \ 2 scan0204 | |
| Progress and instructions for modifications to the 'SS' Car. | 21th Jan 1929 | Box 65a \ 2 scan0205 | |
| Outstanding items for the 'SS' production 10,000-mile car, including work on 'Camacha'. | 21th Jan 1929 | Box 65a \ 2 scan0206 | |
| Recommendation to prepare body schemes for left-hand 'SS' chassis and to build complete cars in England for the American market. | 22th Jan 1929 | Box 65a \ 2 scan0207 | |
| List of experimental and non-standard parts fitted to chassis 8-EX. | 22th Jan 1929 | Box 65a \ 2 scan0208 | |
| The status of experimental 'SS' chassis, including modifications, testing, and issues with frame oscillations. | 24th Jan 1929 | Box 65a \ 2 scan0209 | |
| Ongoing tests on chassis, starter motor, exhaust system, and bump tests for shock absorbers. | 24th Jan 1929 | Box 65a \ 2 scan0210 | |
| Carburation performance in cold weather, comparing the SS type induction pipe to the Phantom's. | 25th Jan 1929 | Box 65a \ 2 scan0211 | |
| From Mr. Hancock outlining various vehicle faults and areas for improvement. | 25th Jan 1929 | Box 65a \ 2 scan0212 | |
| Secret memorandum detailing the extreme confidentiality required for the 'SS' super-sports model chassis. | 25th Jan 1929 | Box 65a \ 2 scan0213 | |
| Five points requiring attention and modification on an 'SS' Chassis. | 25th Jan 1929 | Box 65a \ 2 scan0214 | |
| Modification to the Autovac tank on 'SS' chassis. | 26th Jan 1929 | Box 65a \ 2 scan0215 | |
| Response to a query from Sales regarding the power-to-weight ratio for 'SS' and 'India-4' models. | 26th Jan 1929 | Box 65a \ 2 scan0216 | |
| Listing drawings sent for an 'SS' Chassis to complete prior instructions. | 27th Jan 1929 | Box 65a \ 2 scan0217 | |
| Upcoming trials and modifications for the SS and 20 HP G.4 models. | 27th Jan 1929 | Box 65a \ 2 scan0218 | |
| Timing of announcing central oiling and coordinating the delivery of 'SS' and 20 HP chassis. | 30th Jan 1929 | Box 65a \ 2 scan0219 | |
| Secret internal memorandum discussing issues with front spring anchorage pins and pendulum lever ball end wear. | 30th Jan 1929 | Box 65a \ 2 scan0220 | |
| Continued memorandum discussing overflow pipes, petrol and lubrication pipe clipping, and soldered joints on the front axle. | 25th Jan 1929 | Box 65a \ 2 scan0221 | |
| Production of the 'SS' model and postponing a conference about chassis details. | 31th Jan 1929 | Box 65a \ 2 scan0222 | |
| Several outstanding technical issues with the 'SS' chassis. | 31th Jan 1929 | Box 65a \ 2 scan0223 | |
| Issues and proposed solutions for headlamp brackets, shutter control, and oil system components. | 15th Feb 1929 | Box 65a \ 2 scan0224 | |
| Telegram from Hancock to Hives regarding his arrival and planned return. | 15th Feb 1929 | Box 65a \ 2 scan0225 | |
| Development, testing schedule, and approval process for the 21-EX ('SS' Chassis) model. | 2nd Feb 1929 | Box 65a \ 2 scan0226 | |
| List of actions and updates for various components of the 'SS' chassis. | 1st Feb 1929 | Box 65a \ 2 scan0227 | |
| Performance and feedback report on a test car after extensive mileage. | 2nd Feb 1929 | Box 65a \ 2 scan0228 | |
| Design review discussing improvements to the windscreen, wheel carriers, and bonnet. | 7th Feb 1929 | Box 65a \ 2 scan0229 | |
| Test report detailing engine performance, consumption, detonation levels, and identified mechanical issues. | 7th Feb 1929 | Box 65a \ 2 scan0230 | |
| Table of engine power readings at various RPMs with the exhaust cutout open and closed, along with commentary. | 8th Feb 1929 | Box 65a \ 2 scan0231 | |
| Secret report on cold weather starting tests for SS cars, leading to the deletion of exhaust heating. | 8th Feb 1929 | Box 65a \ 2 scan0232 | |
| Confirming the manufacturing programme for 200 units of the 40/50 HP Chassis, Series J.2. | 9th Feb 1929 | Box 65a \ 2 scan0233 | |
| Production schedule and material plan for the 40/50 HP Chassis, Series J.2. | 16th Jan 1929 | Box 65a \ 2 scan0234 | |
| Test report on the S.S. Car 20-EX, detailing points for consideration regarding engine vibration, steering, and performance. | 1st Feb 1929 | Box 65a \ 2 scan0235 | |
| Vehicle performance, carburation, suspension, transmission, and fumes in the body. | 1st Feb 1929 | Box 65a \ 2 scan0236 | |
| Test report detailing performance issues with the engine starter, exhaust, brakes, oil pressure, and general engine characteristics. | 9th Feb 1929 | Box 65a \ 2 scan0237 | |
| Technical report outlining issues with the radiator, undershield, suspension, and engine oil filler. | 9th Feb 1929 | Box 65a \ 2 scan0238 | |
| Photographs of the 18-EX car taken in France. | 2nd Feb 1929 | Box 65a \ 2 scan0239 | |
| On the delayed readiness of the 'SS' car for sales trials in France. | 2nd Feb 1929 | Box 65a \ 2 scan0240 | |
| Request to order 16 photos with instructions on density and delivery to Mr. Hives. | 13th Feb 1929 | Box 65a \ 2 scan0241 | |
| Secret memo requesting dates for the handover of a car for inspection, testing, and transport to France. | 13th Feb 1929 | Box 65a \ 2 scan0242 | |
| Mr. Elliott's visit to Le Canadel, a 10,000-mile car test, and finalising the engine mounting and exhaust. | 15th Feb 1929 | Box 65a \ 2 scan0243 | |
| Listing models of 'SS' chassis parts to be provided by the Experimental Department to the Works. | 21th Feb 1929 | Box 65a \ 2 scan0244 | |
| Production of 'SS' cars for the U.S.A. and the need to coordinate with the Springfield plant on chassis modifications. | 1st Feb 1929 | Box 65a \ 2 scan0245 | |
| Requesting a definite handover date for the inspection of '21-EX'. | 25th Feb 1929 | Box 65a \ 2 scan0246 | |
| Hs. to CWB. regarding the delayed handover of the 21-EX car for testing. | 26th Feb 1929 | Box 65a \ 2 scan0247 | |
| On the cornering performance of a 18-EX close-coupled four-seater, with safety suggestions for buyers regarding top-heavy loads. | 1st Mar 1929 | Box 65a \ 2 scan0248 | |
| Car test troubles for the 21-EX car, detailing issues with the clutch, noisy gears, and inefficient brakes, along with requested actions. | 11th Mar 1929 | Box 65a \ 2 scan0249 | |
| Telegram received by telephone regarding car production and travel arrangements. | 13th Aug 1929 | Box 65a \ 2 scan0250 | |
| Telegram message concerning a delay for the 'Robotham car' pending a production scheme recommendation. | 13th Mar 1929 | Box 65a \ 2 scan0251 | |
| Outlining requirements for a weekly progress report on the 'SS' and Schneider Cup 'R' engine projects. | 13th Mar 1929 | Box 65a \ 2 scan0252 | |
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