| Description | Date | Identifier | |
| Mr. Royce's feedback on the steering, springing, and engine of the 14-EX car. | 21th May 1928 | Box 20 \ 11 Scan257 | |
| Letter arranging for a car to be sent for a 2,000-mile, ten-day test trip from the 14th of June. | 21th May 1928 | Box 20 \ 11 Scan258 | |
| Query regarding whether a car being loaned to Lord Wargrave is fitted with a luggage grid for a trip to Spain. | 24th May 1928 | Box 20 \ 11 Scan259 | |
| Secret report detailing feedback on a car's engine vibration and road spring performance. | 4th May 1928 | Box 20 \ 11 Scan260 | |
| Steering improvements and testing methodologies for high-speed driving on French roads. | 24th May 1928 | Box 20 \ 11 Scan261 | |
| Trial of an 8-EX and 70-HP open trials car as a comparison for the 14-EX. | 24th May 1928 | Box 20 \ 11 Scan262 | |
| Assessment of experimental car 11-G-111, detailing its non-standard parts, condition, and options for sale or overhaul. | 1st May 1928 | Box 20 \ 11 Scan263 | |
| Outlining the travel arrangements for Lord Wargrave's trip to Spain. | 30th May 1928 | Box 20 \ 11 Scan264 | |
| From Hs. to C. discussing the provision of either car 14-EX or 8-EX for the Chairman, Lord Wargrave. | 30th May 1928 | Box 20 \ 11 Scan265 | |
| Arrangements for a driver for Lord Wargrave's trip to Spain. | 31th May 1928 | Box 20 \ 11 Scan266 | |
| Car arrangements and logistics for Lord Wargrave's trip to Spain. | 1st Jun 1928 | Box 20 \ 11 Scan267 | |
| Agreeing to use the 8-EX car for Lord Wargrave's trip and requesting its return for modifications. | 1st Jun 1928 | Box 20 \ 11 Scan268 | |
| Performance test report on the 8-EX experimental car, detailing engine, clutch, and steering characteristics. | 1st Jun 1928 | Box 20 \ 11 Scan269 | |
| Steering feel, suspension performance, and lighting control systems. | 1st Jun 1928 | Box 20 \ 11 Scan270 | |
| The 8-EX car, its return to Bond Street Garage, and notes on tappet noise during warm-up. | 24th May 1928 | Box 20 \ 11 Scan271 | |
| Listing parts fitted to the 8-EX car and requesting a critique of the engine, steering, and a new spotlight. | 24th May 1928 | Box 20 \ 11 Scan272 | |
| Current status and potential future disposal of car 8-EX. | 2nd Jun 1928 | Box 20 \ 11 Scan273 | |
| Return of car 8-EX for testing new items during Lord Wargrave's trip. | 4th Jun 1928 | Box 20 \ 11 Scan274 | |
| Particulars of car 8-EX for Lord Wargrave for triptyque papers. | 1st Jun 1928 | Box 20 \ 11 Scan275 | |
| Request for canvas and straps to cover luggage for Lord Wargrave's trip. | 7th Jun 1928 | Box 20 \ 11 Scan276 | |
| Final instructions for the delivery and shipment of car 8-EX for Lord Wargrave. | 8th Jun 1928 | Box 20 \ 11 Scan277 | |
| Confirming arrangements for car 8-EX for Lord Wargrave, including collection of canvas and straps and travel to France. | 9th Jun 1928 | Box 20 \ 11 Scan278 | |
| Return of non-standard experimental parts fitted to chassis 10-G3. | 12th Jun 1928 | Box 20 \ 11 Scan279 | |
| The performance of car 8.EX during a road test in France with Lord Wargrave. | 15th Oct 1926 | Box 20 \ 11 Scan280 | |
| Telegram from Gibson to Hives reporting on engine performance. | 15th Sep 1936 | Box 20 \ 11 Scan281 | |
| Letter instructing Mr. Dodd to return the 8-EX car to Derby. | 18th Jun 1928 | Box 20 \ 11 Scan282 | |
| Follow-up inquiry regarding the status and return of Car No. 14.EX. | 21th Jun 1928 | Box 20 \ 11 Scan283 | |
| Use of a sports car for an event at Hendon, detailing attendees and driver arrangements. | 22th Jun 1928 | Box 20 \ 11 Scan284 | |
| Letter from B.J. to R. discouraging the use of a sports car to avoid starting rumors about a new speed model. | 25th Jun 1928 | Box 20 \ 11 Scan285 | |
| Logistical arrangements for the exchange of a Sports car and the 14-EX car. | 25th Jun 1928 | Box 20 \ 11 Scan286 | |
| Outlining the logistical arrangements for transporting 'R.' to the Hendon Pageant, involving the 14-EX and open trials cars. | 25th Jun 1928 | Box 20 \ 11 Scan287 | |
| Quarterly note requesting a return, in duplicate, of all company cars and lorries at the Derby site and their purpose. | 26th Jun 1928 | Box 20 \ 11 Scan288 | |
| Status report on experimental cars, detailing their configuration and current usage. | 26th Jun 1928 | Box 20 \ 11 Scan289 | |
| Letter discussing arrangements for a car swap and secure lock-up for car 14-EX. | 26th Jun 1928 | Box 20 \ 11 Scan290 | |
| Arrangements for borrowing a car for the Hendon Air Pageant and swapping it with car 14-EX. | 27th Jun 1928 | Box 20 \ 11 Scan291 | |
| Confirmation of a wire regarding a decision not to go to a pageant. | 28th Jun 1928 | Box 20 \ 11 Scan292 | |
| Confirming receipt of a wire to cancel a car for Hendon. | 28th Jun 1928 | Box 20 \ 11 Scan293 | |
| Relaying a telegram cancelling a car requirement for a pageant. | 28th Jun 1928 | Box 20 \ 11 Scan294 | |
| Lord Wargrave's suggestion to sell an experimental car to Sir George Touche. | 30th Jun 1928 | Box 20 \ 11 Scan295 | |
| Request for a personal or experimental car for a holiday, with a secondary offer to sell a loudspeaker. | 3rd Jul 1928 | Box 20 \ 11 Scan296 | |
| Report on the modifications to the 10-EX vehicle to make it into a speed car. | 4th Jul 1928 | Box 20 \ 11 Scan297 | |
| Supplying a 20 HP car, chassis 10-G-111, and a query about a loudspeaker. | 1st Jul 1928 | Box 20 \ 11 Scan298 | |
| Clarifying the purpose of the experimental car 10-EX, confirming it is for steering and suspension tests, not development as a speed car. | 5th Jul 1928 | Box 20 \ 11 Scan299 | |
| From Hs. to PN. regarding a delay in providing car 9-G-111 due to a damaged piston and required tests. | 9th Jul 1928 | Box 20 \ 11 Scan300 | |
| Letter arranging the use of a trials car and the transport of another vehicle to Eastbourne. | 10th Jul 1928 | Box 20 \ 11 Scan301 | |
| Confirming travel arrangements for a driver to travel to Derby for a 20 HP car. | 27th Jul 1928 | Box 20 \ 11 Scan302 | |
| Work order for inspection, testing, and preparation for sale of the 40/50HP Experimental Car, Chassis No. 16-EX. | 16th Aug 1929 | Box 20 \ 11 Scan303 | |
| The sale of the 16-EX car and the need to replace non-standard parts. | 8th Mar 1928 | Box 20 \ 11 Scan304 | |
| Confirming a telegram about the return of the 16-EX sports car for alterations before shipment to India. | 21th Aug 1928 | Box 20 \ 11 Scan305 | |
| Post Office telegram confirming a message about disposing of a wire. | 21th Aug 1928 | Box 20 \ 11 Scan306 | |
| The non-standard and newly-standardised features of the sold experimental car 16-EX. | 1st Mar 1928 | Box 20 \ 11 Scan307 | |
| Sports car's condition, reliability, and necessary pre-dispatch testing. | 5th Sep 1928 | Box 20 \ 11 Scan308 | |
| Status and future testing of the 17-EX sports car. | 5th Sep 1928 | Box 20 \ 11 Scan309 | |
| Request for an inventory of company cars and lorries at the Derby site and their usage. | 2nd Oct 1928 | Box 20 \ 11 Scan310 | |
| Secret internal memo discussing the sale and status of the Phantom Sports Cars, including models 15-EX, 16-EX, and 17-EX. | 25th Oct 1928 | Box 20 \ 11 Scan311 | |
| The replacement of cars for the Instruction School. | 26th Oct 1928 | Box 20 \ 11 Scan312 | |
| Delays in car improvement progress, citing the impact of aero work and concerns over stock levels. | 26th Oct 1928 | Box 20 \ 11 Scan313 | |
| The availability of cars for an instruction school. | 1st Nov 1928 | Box 20 \ 11 Scan314 | |
| Requesting a list of non-standard parts for the 40/50HP Open Car No.17-EX. | 6th Nov 1928 | Box 20 \ 11 Scan315 | |
| Responding to a report on the performance of the 12-EX CAR, addressing engine, clutch, brakes, steering, suspension, and fuel starvation. | 1st Nov 1928 | Box 20 \ 11 Scan316 | |
| From Hs. to R. arranging for car 14-EX to be brought to W.W. | 10th Nov 1928 | Box 20 \ 11 Scan317 | |
| Request for an updated experimental chassis to be used for instruction at the School, replacing one with an older type of change gear. | 24th Nov 1928 | Box 20 \ 11 Scan318 | |
| The dismantling and scrapping of a dummy chassis. | 23th Nov 1928 | Box 20 \ 11 Scan319 | |
| The registration and licensing for a Phantom car 18-EX. | 29th Nov 1928 | Box 20 \ 11 Scan320 | |
| The disposal and dismantling of a dummy chassis. | 23th Nov 1928 | Box 20 \ 11 Scan321 | |
| Follow-up memo regarding a request to use a 20 HP car for a week over the Christmas period. | 5th Dec 1928 | Box 20 \ 11 Scan322 | |
| Confirmation of a wire requesting photos be taken of vehicle 18-EX before it leaves for France. | 8th Dec 1928 | Box 20 \ 11 Scan323 | |
| The unavailability of an experimental car for Christmas. | 11th Dec 1928 | Box 20 \ 11 Scan324 | |
| Apologizing for the inability to provide a car for Christmas. | 11th Dec 1928 | Box 20 \ 11 Scan325 | |
| Typed memo in reply to a wire, requesting the '20' vehicle be at Barlow Mews on a Thursday afternoon. | 17th Dec 1928 | Box 20 \ 11 Scan326 | |
| Need for varied routes and limited spares for 10,000-mile test cars to avoid suspicion from authorities in France. | 7th Jan 1929 | Box 20 \ 11 Scan327 | |
| Telegram confirming agreement to proceed with a new car and suggested modifications. | 3rd Jan 1929 | Box 20 \ 11 Scan328 | |
| Proposing to avoid a specific route for sending cars and spares in the future. | 8th Jan 1929 | Box 20 \ 11 Scan329 | |
| Query regarding the status of an Experimental car for the Instruction Class. | 1st Jan 1929 | Box 20 \ 11 Scan330 | |
| The handover of Phantom car 8-EX and the disposal of its Hooper limousine body. | 17th Jan 1929 | Box 20 \ 11 Scan331 | |
| Disposal of the obsolete experimental car 98-NK, an original Phantom built on a Silver Ghost chassis. | 1st Jan 1929 | Box 20 \ 11 Scan332 | |
| Requesting the return of non-standard parts from a chassis to the Experimental Department. | 22th Jan 1929 | Box 20 \ 11 Scan333 | |
| Repairing an experimental car for secondhand sale and requesting a list of experimental pieces on other vehicles. | 22th Jan 1929 | Box 20 \ 11 Scan334 | |
| List of experimental and non-standard parts fitted to chassis 8-EX, number X7770. | 22th Jan 1929 | Box 20 \ 11 Scan335 | |
| From Hs. to CWB. regarding the delayed handover of the 21-EX test car. | 26th Feb 1929 | Box 20 \ 11 Scan336 | |
| The future use of two experimental cars, 10-EX and 10-G3. | 6th Mar 1929 | Box 20 \ 11 Scan337 | |
| Request for a report on experimental parts fitted to chassis 10-G-3 that need removal before the car is sold. | 15th Mar 1929 | Box 20 \ 11 Scan338 | |
| List of non-standard experimental parts fitted to chassis 10-G3. | 19th Mar 1929 | Box 20 \ 11 Scan339 | |
| Urgent request to identify which non-standard experimental parts on chassis 10-G-3 can be replaced by standard parts. | 19th Mar 1929 | Box 20 \ 11 Scan340 | |
| Non-standard parts permitted to remain on chassis 10-G3. | 20th Mar 1929 | Box 20 \ 11 Scan341 | |
| Telegram received by telephone regarding car choice and delivery arrangements for car 21 EX. | 21th Mar 1929 | Box 20 \ 11 Scan342 | |
| Telegram to 'Roycar Derby' regarding meeting arrangements and the return of a car. | 1st Mar 1929 | Box 20 \ 11 Scan343 | |
| Request from PN to obtain a 20 HP car for an extended holiday. | 3rd Jun 1929 | Box 20 \ 11 Scan344 | |
| Logistics and potential disruption of a 20 HP car's 10,000-mile endurance test in France. | 6th Jun 1929 | Box 20 \ 11 Scan345 | |
| Telegram from Royce to Hives canceling a request for a 'Twenty' car for a London trip. | 11th Jun 1929 | Box 20 \ 11 Scan346 | |
| Available experimental 20 HP and Phantom cars for disposal. | 20th Jun 1929 | Box 20 \ 11 Scan347 | |
| Wireless set for a car for customs purposes and requesting daily reports on the car's performance. | 21th Jun 1929 | Box 20 \ 11 Scan348 | |
| The arrangement of a covered car for Mr. Trayner, Senior. | 2nd Jul 1929 | Box 20 \ 11 Scan349 | |
| Arranging a car for Mr. Trayner, cancelling a previous request to the Experimental Department. | 3rd Jul 1929 | Box 20 \ 11 Scan350 | |
| Outlining a publicity strategy for a new model, including a catalogue foreword by journalist Capt. Gordon Aston. | 9th Jul 1929 | Box 20 \ 11 Scan351 | |
| Requesting a reply regarding the availability of 20 HP or 40/50 HP experimental cars for sale. | 16th Jul 1929 | Box 20 \ 11 Scan352 | |
| The disposal of a 20 HP car, 17-G4, after completing a 10,000-mile test. | 17th Jul 1929 | Box 20 \ 11 Scan353 | |
| Secret internal memo about clearing out experimental cars before a new 'SS' model is announced. | 19th Jul 1929 | Box 20 \ 11 Scan354 | |
| Potential disposal of several standard and non-standard experimental cars, detailing their unique specifications and current use. | 20th Jul 1939 | Box 20 \ 11 Scan355 | |
| Page 2 of a memorandum detailing specific car models, their features, and allocation. | 24th Jul 1929 | Box 20 \ 11 Scan356 | |
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