| Description | Date | Identifier | |
| Technical points for the exhaust heated throttle and pilot jet scheme. | 29th Dec 1921 | Box 76 \ 2 scan0169 | |
| Flywheel range requirements for a 40/50 HP car and the location of a Bendix Pinion. | 29th Dec 1921 | Box 76 \ 2 scan0170 | |
| The Goshawk II magneto drive, referencing drawing LeO.1514. | 14th Jan 1922 | Box 76 \ 2 scan0171 | |
| Request for Hoffmann Ball Bearings for the Goshawk II Magneto & Dynamo Drive experiment. | 19th Jan 1922 | Box 76 \ 2 scan0172 | |
| The distribution of blueprints for the 'GOSHAWK II' magneto and dynamo drive experiment. | 1st Feb 1922 | Box 76 \ 2 scan0173 | |
| Parts list for the 'Goshawk II' Magneto & Dynamo Drive experiment, detailing required components. | 2nd Feb 1922 | Box 76 \ 2 scan0174 | |
| Continuation page cancelling previous part instructions and attaching new blueprints. | 2nd Feb 1922 | Box 76 \ 2 scan0175 | |
| Lubrication and rattle of the magneto drive for the 40/50 chassis. | 28th Apr 1932 | Box 76 \ 2 scan0176 | |
| Solution for rattles in the Goshawk engine's magneto drive. | 9th Sep 1922 | Box 76 \ 2 scan0177 | |
| Letter discussing lost sales of the 20 HP model due to customer objections to left-hand control and suggestions for magneto drives for overseas markets. | 23th Nov 1922 | Box 76 \ 2 scan0178 | |
| Magneto drive rattles on 20 HP cars and the difficulty of removing the magneto. | 1st Dec 1922 | Box 76 \ 2 scan0179 | |
| Implementation of an oil level indicator on the 40/50 model and improvements to the magneto drive to reduce rattles. | 12th Dec 1932 | Box 76 \ 2 scan0180 | |
| Mr. Royce's approved modifications for the Goshawk 11 magneto coupling shaft. | 16th Dec 1922 | Box 76 \ 2 scan0181 | |
| Outlining the scheme for a Goshawk 11 magneto drive with a sliding coupling, including provisions suggested by Mr. Royce. | 29th May 1923 | Box 76 \ 2 scan0182 | |
| Fitting a Magneto Drive and ignition system to a 20 HP car, detailing difficulties and suggestions. | 13th Jul 1923 | Box 76 \ 2 scan0183 | |
| Improving the magneto's disconnected control connection to prevent it from jamming on gearbox bolts. | 20th Jul 1923 | Box 76 \ 2 scan0184 | |
| Decision not to fit a magneto and drive to the 10,000-mile production chassis No. 412. | 20th Jul 1923 | Box 76 \ 2 scan0185 | |
| Recommending to obtain permission to order material and start production on the Magneto Drive for the 20 HP Chassis. | 1st Aug 1923 | Box 76 \ 2 scan0186 | |
| Query regarding the short pull rod for the magneto controls on a 20 HP chassis. | 24th Aug 1923 | Box 76 \ 2 scan0187 | |
| Objections to a scheme for fitting a magneto to a 20 HP car. | 16th Oct 1923 | Box 76 \ 2 scan0188 | |
| Proposal to replace a charring fibre washer with a paper one in the serrated type magneto drive. | 9th Sep 1921 | Box 76 \ 2 scan0189 | |
| The use and popularity of radiator mascots in the Bombay market. | 2nd Sep 1912 | Box 76 \ 2 scan0190 | |
| Proposed new type of fixing for car mascots to allow them to be swivelled or twisted. | 1st Apr 1920 | Box 76 \ 2 scan0191 | |
| Outlining proposed modifications for fixing the R-R mascot to the radiator. | 9th Apr 1920 | Box 76 \ 2 scan0192 | |
| List of experimental parts which have been finished for the 40/50 chassis. | 15th Apr 1920 | Box 76 \ 2 scan0193 | |
| Query about the mascot coming unscrewed from the radiator cap stud. | 24th Dec 1920 | Box 76 \ 2 scan0194 | |
| Issue of the radiator mascot unscrewing and proposing a more secure pinned and sweated stud. | 31th Dec 1920 | Box 76 \ 2 scan0195 | |
| Modifying the mascot and radiator cap stud mounting. | 31th Dec 1920 | Box 76 \ 2 scan0196 | |
| Querying whether a new, lengthened stud for fixing the mascot to the radiator cap has been adopted as standard. | 7th Jan 1921 | Box 76 \ 2 scan0197 | |
| Discrepancy with the Sales Dept. regarding how studs are fitted to the mascot and radiator cap. | 17th Jan 1922 | Box 76 \ 2 scan0198 | |
| Clarifying that inspectors at coachbuilders have not received mascots with sweated-in studs. | 14th Jan 1921 | Box 76 \ 2 scan0199 | |
| Seeking clarification on whether the standard production mascot has a short tapped hole or a new lengthened stud. | 15th Jan 1921 | Box 76 \ 2 scan0200 | |
| Tapping depth and stud specifications for the 40/50 Chassis radiator mascot. | 17th Jan 1921 | Box 76 \ 2 scan0201 | |
| Modifications to radiator mascots and fillers for the 20 HP and Phantom models, and concerns over casting quality. | 27th Jul 1928 | Box 76 \ 2 scan0202 | |
| Progress report on experimental work for the period of September 5th to October 3rd. | 3rd Oct 1921 | Box 76 \ 2 scan0203 | |
| Minutes from the 6th Coachbuilders Conference discussing car body design issues and improvements. | 8th Oct 1919 | Box 76 \ 2 scan0204 | |
| Conference minutes discussing scuttle ventilation, steering column positions, and wing clearances. | 26th Apr 1917 | Box 76 \ 2 scan0205 | |
| Conference notes discussing criticisms of Barker's bodies and issues with instrument board drawings. | 26th Apr 1917 | Box 76 \ 2 scan0206 | |
| Outlining the content and purpose of a new fortnightly experimental work progress report. | 1st Aug 1920 | Box 76 \ 2 scan0207 | |
| Continuation of a report regarding the Goshawk, Buzzard, Vulture or Aero engines. | 31th Jul 1920 | Box 76 \ 2 scan0208 | |
| Fortnightly progress report on experimental work for various chassis and engines. | 31th Jul 1920 | Box 76 \ 2 scan0209 | |
| List of experimental parts issued, manufactured, and tested for various chassis and engines. | 19th Feb 1920 | Box 76 \ 2 scan0210 | |
| List of updates including wiring schemes, instruction book matter, and issued standardisation sheets. | 17th Aug 1920 | Box 76 \ 2 scan0211 | |
| Distributing a fortnightly report on experimental work. | 17th Aug 1920 | Box 76 \ 2 scan0212 | |
| Progress report on experimental work, detailing designs and modifications for various chassis and engines. | 14th Aug 1920 | Box 76 \ 2 scan0213 | |
| The status of experimental parts manufacturing, experimental tests, and issued standardisation sheets. | 31th Aug 1920 | Box 76 \ 2 scan0214 | |
| Cover sheet for a report on Experimental Work for the fortnight ending 28.8.20. | 31th Aug 1920 | Box 76 \ 2 scan0215 | |
| Fortnightly progress report on experimental work and designs being carried out. | 28th Aug 1920 | Box 76 \ 2 scan0216 | |
| Status report on experimental parts, manufacturing, and tests. | 28th Aug 1920 | Box 76 \ 2 scan0217 | |
| List of experimental tests carried out on various automotive electrical and ignition components. | 23th Sep 1920 | Box 76 \ 2 scan0218 | |
| The dispatch of progress sheets. | 23th Sep 1920 | Box 76 \ 2 scan0219 | |
| Progress report on experimental work, detailing designs and parts. | 18th Sep 1920 | Box 76 \ 2 scan0220 | |
| Experimental manufacturing, various tests on components and engines, and work in the electrical department. | 1st Mar 1919 | Box 76 \ 2 scan0221 | |
| Progress report detailing design work completed and experimental parts issued for various projects. | 2nd Oct 1920 | Box 76 \ 2 scan0222 | |
| Work on experimental parts, electrical components, and standardisation sheets. | 20th Oct 1920 | Box 76 \ 2 scan0223 | |
| The dispatch of progress sheets for the fortnight ending October 16th. | 20th Oct 1920 | Box 76 \ 2 scan0224 | |
| Progress report on experimental work for a fortnight. | 16th Oct 1920 | Box 76 \ 2 scan0225 | |
| Progress report detailing work on various mechanical components, experimental tests, and electrical work. | 1st Nov 1920 | Box 76 \ 2 scan0226 | |
| List of four issued standardisation sheets for various components. | 1st Nov 1920 | Box 76 \ 2 scan0227 | |
| Dispatch of progress sheets for the fortnight ending October 3rd. | 1st Nov 1920 | Box 76 \ 2 scan0228 | |
| Progress sheet for the fortnight, detailing designs received and work completed at Derby. | 30th Oct 1923 | Box 76 \ 2 scan0229 | |
| Experimental parts issued, work carried out at Derby, electrical experiments, and standardisation sheets issued. | 18th Nov 1920 | Box 76 \ 2 scan0230 | |
| Distributing progress sheets for experimental work. | 18th Nov 1920 | Box 76 \ 2 scan0231 | |
| Fortnightly progress report on experimental design and production work. | 15th Nov 1929 | Box 76 \ 2 scan0232 | |
| Summary of experimental work, tests, and standardisations carried out on various automotive and aero components. | 27th Nov 1920 | Box 76 \ 2 scan0233 | |
| Cover memo for a fortnightly progress report on experimental work. | 27th Nov 1920 | Box 76 \ 2 scan0234 | |
| Progress report on experimental work, detailing designs received, work carried out at Derby, and work issued by the Production D.O. | 27th Nov 1920 | Box 76 \ 2 scan0235 | |
| List detailing the status of experimental work and tests on various engine and car components. | 15th Dec 1920 | Box 76 \ 2 scan0236 | |
| Distributing progress sheets for experimental work. | 15th Dec 1920 | Box 76 \ 2 scan0237 | |
| Fortnightly progress report on experimental work, listing designs received and work carried out at Derby. | 11th Dec 1920 | Box 76 \ 2 scan0238 | |
| Progress report on experimental work, tests, and development of various vehicle components. | 11th Dec 1920 | Box 76 \ 2 scan0239 | |
| Standardisation sheet detailing a modified wearing plate for the rear springs. | 1st Jan 1921 | Box 76 \ 2 scan0240 | |
| Covering memo for a three-week progress report on experimental work. | 1st Jan 1921 | Box 76 \ 2 scan0241 | |
| Progress report on experimental work for the 'Goshawk' and 'Kite' projects. | 3rd Jan 1921 | Box 76 \ 2 scan0242 | |
| Progress report on various engine and chassis components, experimental work, and standardisation efforts. | 18th Jan 1921 | Box 76 \ 2 scan0243 | |
| Cover memo for progress sheets on experimental work for the fortnight ending January 16th. | 18th Jan 1921 | Box 76 \ 2 scan0244 | |
| Fortnightly progress report on experimental design work and tasks issued by the Drawing Office. | 15th Jan 1921 | Box 76 \ 2 scan0245 | |
| Progress report listing work on engine and chassis components for Goshawk, Condor, and Buzzard projects, including experimental work and tests. | 3rd Feb 1921 | Box 76 \ 2 scan0246 | |
| Cover note for the fortnightly progress sheets on experimental work. | 3rd Feb 1921 | Box 76 \ 2 scan0247 | |
| Fortnightly progress report on experimental work, detailing designs received and work completed at Derby. | 30th Jan 1921 | Box 76 \ 2 scan0248 | |
| Status report on experimental work, including completed projects, works in progress, and various tests. | 8th Feb 1921 | Box 76 \ 2 scan0249 | |
| Progress list report detailing new designs and experimental work for January. | 8th Feb 1921 | Box 76 \ 2 scan0250 | |
| Cover memo for progress sheets on experimental work. | 19th Feb 1921 | Box 76 \ 2 scan0251 | |
| Progress report on experimental work, listing designs received and work carried out at Derby. | 19th Feb 1921 | Box 76 \ 2 scan0252 | |
| Progress and status report on experimental work, tests, and parts for various vehicle components. | 5th Mar 1921 | Box 76 \ 2 scan0253 | |
| Cover letter for fortnightly progress sheets on experimental work. | 5th Mar 1921 | Box 76 \ 2 scan0254 | |
| Progress report on experimental work, listing design instructions, work carried out, and details of experimental parts issued. | 5th Mar 1920 | Box 76 \ 2 scan0255 | |
| Progress report on various engineering projects, modifications, and tests. | 8th Mar 1921 | Box 76 \ 2 scan0256 | |
| Completion of bench tests for various magnetos, including Conner, B.T.H., and Bosch for Goshawk. | 8th Mar 1921 | Box 76 \ 2 scan0257 | |
| Cover memo for an attached fortnightly progress list on experimental work. | 22th Mar 1921 | Box 76 \ 2 scan0258 | |
| Progress report on experimental work, detailing designs received, work carried out at Derby, and parts issued by the D.O. | 21th Mar 1921 | Box 76 \ 2 scan0259 | |
| Progress report on experimental work, tests, and completed parts. | 23th Mar 1920 | Box 76 \ 2 scan0260 | |
| List of continued experimental work on various electrical components like magnetos, condensers, batteries, and dynamos. | 10th Dec 1920 | Box 76 \ 2 scan0261 | |
| Cover memo for a fortnightly progress list on experimental work. | 5th Apr 1921 | Box 76 \ 2 scan0262 | |
| Progress report on experimental work for the fortnight ending 2nd April. | 2nd Apr 1915 | Box 76 \ 2 scan0263 | |
| Status report listing vehicle components, their reference numbers, and the completion status of their designs. | 10th Dec 1920 | Box 76 \ 2 scan0264 | |
| List of experimental tests and electrical experimental work conducted. | 10th Dec 1920 | Box 76 \ 2 scan0265 | |
| Priority of experimental work on the Buzzard rear axle and its potential use for the Vulture model. | 8th Apr 1921 | Box 76 \ 2 scan0266 | |
| Cover memo for a fortnightly progress list on experimental work. | 20th Apr 1921 | Box 76 \ 2 scan0267 | |
| Progress report on experimental work for a fortnight ending on the 16th of April. | 20th Apr 1921 | Box 76 \ 2 scan0268 | |
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