| Description | Date | Identifier | |
| Required body reconstruction for car 7-EX due to flexing, squeaking, and a faulty door, and a request for a temporary vehicle. | 3rd Jun 1926 | Box 57 \ 1 Scan249 | |
| Preparing a 20 HP chassis for a 10,000-mile test and requesting a new petrol tank filler design. | 16th Jun 1926 | Box 57 \ 1 Scan250 | |
| New shorter steering column for the 20 HP experimental car and its impact on body modifications. | 21th Jun 1926 | Box 57 \ 1 Scan251 | |
| Design of low car seating and floor height for comfort and practicality. | 22th Jun 1926 | Box 57 \ 1 Scan252 | |
| Continued memo describing a trial of the 12-EX model, specifically critiquing the rear seat design. | 24th Jun 1926 | Box 57 \ 1 Scan253 | |
| Performance of the Goshawk model and outlining future improvements. | 24th Jun 1926 | Box 57 \ 1 Scan254 | |
| Potential modifications and market positioning for a car model in relation to the Phantom and 40/50 models. | 16th Jul 1926 | Box 57 \ 1 Scan255 | |
| Listing standardized and proposed new features for the 20 HP Chassis number 1644. | 16th Jul 1926 | Box 57 \ 1 Scan256 | |
| Road test and issues with a High Compression 20 HP car. | 1st Aug 1926 | Box 57 \ 1 Scan257 | |
| Proposed use of an experimental '20' car in London. | 16th Aug 1926 | Box 57 \ 1 Scan258 | |
| Providing feedback on the steering and hydraulic shock-absorbers of an Experimental 20 HP car. | 26th Aug 1926 | Box 57 \ 1 Scan259 | |
| Testing of hydraulic rear dampers for the experimental 20 HP car. | 30th Aug 1926 | Box 57 \ 1 Scan260 | |
| Delivering a 20 HP car with a Barker cabriolet body to 'W.W.' for a trial, and the movement of experimental chassis. | 27th Sep 1926 | Box 57 \ 1 Scan261 | |
| Requesting cars for visitors and sales at WW, and inquiring about the status of chassis 7-EX. | 24th Sep 1926 | Box 57 \ 1 Scan262 | |
| Temporary car arrangement for West Wittering. | 1st Oct 1926 | Box 57 \ 1 Scan263 | |
| Comparing specifications of various Chrysler cars against a 20 HP model. | 6th Oct 1926 | Box 57 \ 1 Scan264 | |
| Improvements for Phantom and Goshawk models, focusing on engine performance and vehicle quality. | 27th Oct 1926 | Box 57 \ 1 Scan265 | |
| Increasing power from a 20 HP engine and requesting an estimate. | 2nd Nov 1926 | Box 57 \ 1 Scan266 | |
| Internal memorandum discussing complaints and solutions for Phantom & 20 HP models regarding springing, brake servo, and throttle sticking. | 18th Nov 1926 | Box 57 \ 1 Scan267 | |
| Proposed modifications to the carburetter, steering, and body to address known faults. | 18th Nov 1926 | Box 57 \ 1 Scan268 | |
| Complaints and proposed solutions for Phantom & 20 HP models regarding springing, brake servo, and throttle issues. | 18th Nov 1926 | Box 57 \ 1 Scan269 | |
| Required chassis improvements, including a new carburetter spray chamber, steering adjustments, and remedies for body heat and steering wobble. | 14th Dec 1926 | Box 57 \ 1 Scan270 | |
| New experimental features to be fitted to a 20 HP trial chassis. | 14th Dec 1926 | Box 57 \ 1 Scan271 | |
| Requesting reports on Phantom complaints, radiator shutters, and cast dash and bonnet design. | 14th Dec 1926 | Box 57 \ 1 Scan272 | |
| Query regarding the delivery and body type for a 20 HP Chassis. | 16th Dec 1926 | Box 57 \ 1 Scan273 | |
| Typed memo enquiring about the readiness of a 20 HP chassis. | 16th Dec 1926 | Box 57 \ 1 Scan274 | |
| The features of a 20 HP car, chassis 9-G-111, being sent for inspection. | 1st Dec 1926 | Box 57 \ 1 Scan275 | |
| Plan to test a 20 HP car (9G-III) with new modifications over the Christmas holidays. | 17th Dec 1926 | Box 57 \ 1 Scan276 | |
| Inquiry about retaining the 10-G-111 experimental car and sending a new licence. | 24th Dec 1926 | Box 57 \ 1 Scan277 | |
| Retaining a 20 HP car at WW for design reference, mentioning Mr. Royce and avoiding licensing costs. | 1st Jan 1927 | Box 57 \ 1 Scan278 | |
| Test report on a 20 HP Experimental car, detailing performance, handling, and engine issues. | 4th Jan 1927 | Box 57 \ 1 Scan279 | |
| Test report on the 20 HP Car 9-G-3, detailing performance of its steering, hydraulic dampers, and petrol gauge. | 30th Dec 1926 | Box 57 \ 1 Scan280 | |
| Standardisation of a rectangular fitting and engine performance with a Benzol/petrol fuel mixture. | 30th Dec 1926 | Box 57 \ 1 Scan281 | |
| Requesting comments on the features of a 20 HP car which was in London over Christmas. | 11th Jan 1927 | Box 57 \ 1 Scan282 | |
| Impressions and feedback report on the performance of an experimental 20 HP Chassis, 9-G-III. | 12th Jan 1927 | Box 57 \ 1 Scan283 | |
| Typed report on vehicle performance, discussing acceleration, vibration, and the benefits of larger tyres. | 17th Jan 1927 | Box 57 \ 1 Scan284 | |
| Request for various spare parts for a make-shift 20 HP car. | 17th Jan 1927 | Box 57 \ 1 Scan285 | |
| From BJ to HS regarding arranging a car for Colonel Fell's visit to 'R'. | 1st Jan 1927 | Box 57 \ 1 Scan286 | |
| Results of a freeze test on four cylinders. | 21th Jan 1927 | Box 57 \ 1 Scan287 | |
| Arrangements to lend a 20 HP car, chassis 10-GIII, to Col. and Mrs. Fell for a visit to France. | 26th Jan 1927 | Box 57 \ 1 Scan288 | |
| List of parts that can be run for 10,000 miles on a 20 HP car. | 26th Jan 1927 | Box 57 \ 1 Scan289 | |
| Feedback on a new trials car, parts stock management, and planned improvements for the 20HP model. | 4th Feb 1927 | Box 57 \ 1 Scan290 | |
| Outlining the worst features of the 20 HP model and the proposed engineering solutions. | 1st Feb 1927 | Box 57 \ 1 Scan291 | |
| Inquiring about the departure date for Col. Fell with a 20 HP car to France. | 7th Feb 1927 | Box 57 \ 1 Scan292 | |
| Outlining the future use of an experimental car after reaching 10,000 miles. | 17th Feb 1927 | Box 57 \ 1 Scan293 | |
| Works order for chassis 10G3, listing various parts including a complete fan assembly, for Automobiles Rolls-Royce (France) Ltd. | 4th Mar 1927 | Box 57 \ 1 Scan294 | |
| Works order listing parts for chassis no. 20-HP 10G3 for a customer in Paris. | 4th Mar 1927 | Box 57 \ 1 Scan295 | |
| List of parts and modifications fitted to chassis 10.GILL, including springs, shock dampers, and steering components. | 4th Mar 1927 | Box 57 \ 1 Scan296 | |
| Technical specifications for hydraulic shock dampers including bush and lever measurements and pressure loadings. | 4th Mar 1927 | Box 57 \ 1 Scan297 | |
| Specification sheet detailing components including steering tube, dashboard, pedals, petrol tank, various carriers, and fittings. | 4th Mar 1927 | Box 57 \ 1 Scan298 | |
| Certificate of inspection detailing modifications and parts fitted to various vehicle components. | 4th Mar 1928 | Box 57 \ 1 Scan299 | |
| Certificate of inspection detailing modifications to an engine unit. | 4th Mar 1927 | Box 57 \ 1 Scan300 | |
| A.I.D. (Aeronautical Inspection Directorate) inspection certificate for a list of aero engine and electrical spares. | 14th Mar 1927 | Box 57 \ 1 Scan301 | |
| The completion of a Saloon Cab De Ville body and the logistical requirement of a chassis for final assembly. | 25th Mar 1927 | Box 57 \ 1 Scan302 | |
| Listing new features fitted to a test car with remarks on their status. | 22th Apr 1927 | Box 57 \ 1 Scan303 | |
| List of components and modifications, noting which have been standardised. | 23th Apr 1927 | Box 57 \ 1 Scan304 | |
| Suggestion to alter the valve timing on the Sports Phantom for improved high-speed output, referencing a comparison with a Lorraine engine. | 23th Apr 1927 | Box 57 \ 1 Scan305 | |
| Experimental work and designs available for chassis improvements, specifically on suspension and brakes for the 40/50 HP model. | 26th Apr 1927 | Box 57 \ 1 Scan306 | |
| Issues and proposed improvements for brakes, steering, and the petrol supply system. | 26th Apr 1927 | Box 57 \ 1 Scan307 | |
| Potential chassis improvements including lubrication, front springs, lowering, and weight reduction. | 26th Apr 1927 | Box 57 \ 1 Scan308 | |
| Suspension, brake, and steering issues for the 20 HP model, with comparisons to the 40/50 HP. | 5th Mar 1927 | Box 57 \ 1 Scan309 | |
| From 'R' to 'Hs' requesting a 20 HP car for use and reference, with a preference for a Lorraine model fitted with a crankshaft damper. | 5th Mar 1927 | Box 57 \ 1 Scan310 | |
| The return of a Lorraine-Dietrich car to France for sale due to it being left-hand drive. | 6th May 1927 | Box 57 \ 1 Scan311 | |
| Update on the status and potential standardization of various experimental design features for Phantom and India models. | 7th May 1927 | Box 57 \ 1 Scan312 | |
| Listing eight parts for standardisation on a test car upon completion of 10,000 miles. | 10th May 1927 | Box 57 \ 1 Scan313 | |
| Progress on experimental designs for the Phantom model, including instruments, lamps, and carrier. | 10th May 1927 | Box 57 \ 1 Scan314 | |
| Tests, feedback, and standardisation of various vehicle components including dashboards, steering, and chassis. | 10th May 1927 | Box 57 \ 1 Scan315 | |
| Feedback and proposed changes for various vehicle components, including isolation, controls, and levers. | 13th May 1927 | Box 57 \ 1 Scan316 | |
| Requirements for a 20 HP reference car, detailing preferred body styles and seating. | 13th May 1927 | Box 57 \ 1 Scan317 | |
| From R. to Hs. regarding chassis work problems and a request to bring two vehicles. | 14th May 1927 | Box 57 \ 1 Scan318 | |
| Experimental designs for the Phantom model, covering instruments, headlamps, and carriers. | 14th May 1927 | Box 57 \ 1 Scan319 | |
| Design improvements and standardisation for various vehicle components. | 23th May 1927 | Box 57 \ 1 Scan320 | |
| 20 HP Hooper fixed head cabriolet body for Mr. Royce. | 23th May 1927 | Box 57 \ 1 Scan321 | |
| List of required modifications for the Goshawk 20 HP chassis following a 10,000-mile test in France. | 25th May 1927 | Box 57 \ 1 Scan322 | |
| Hooper fixed head Cabriolet body, including colour scheme and fitting timeline. | 25th May 1927 | Box 57 \ 1 Scan323 | |
| List of car development objectives for a board meeting concerning the 40/50 and Phantom models. | 25th May 1927 | Box 57 \ 1 Scan324 | |
| Internal query regarding the suitability of a recently returned chassis for a Hooper fixed cabriolet body on a 20 HP car. | 25th May 1927 | Box 57 \ 1 Scan325 | |
| The paint and proposed upholstery for a 20 HP car with a Hooper body. | 26th May 1927 | Box 57 \ 1 Scan326 | |
| Painting and trim instructions for a Hooper 20 HP body, using a Phantom (EAC.7) as a reference. | 30th May 1927 | Box 57 \ 1 Scan327 | |
| Painting instructions for a 20 HP car body. | 31th May 1927 | Box 57 \ 1 Scan328 | |
| Upholstery and paint preferences for a 20 HP car for W.W. | 30th May 1927 | Box 57 \ 1 Scan329 | |
| From Hs. to CWB. regarding a big end bearing failure on car 10-G-111. | 10th Jun 1927 | Box 57 \ 1 Scan330 | |
| Loan of a Phantom car for a visitor from Springfield, which will cause a car shortage. | 15th Jun 1927 | Box 57 \ 1 Scan331 | |
| Loan car for P.N. and an inquiry about the traffic test for car 10-G-3. | 16th Jun 1927 | Box 57 \ 1 Scan332 | |
| Reference note regarding earlier correspondence on customers' complaints. | 28th Jun 1927 | Box 57 \ 2 Scan001 | |
| Technical response concerning the electrical dynamo output and current load for a 20 HP car, specifically for Lord Dawson of Penn. | 28th Jun 1927 | Box 57 \ 2 Scan002 | |
| The investigation of a customer complaint regarding a frayed dynamo cable causing an intermittent fault. | 17th Aug 1931 | Box 57 \ 2 Scan003 | |
| Responding to quarterly complaints about various electrical components and instruments. | 1st Nov 1931 | Box 57 \ 2 Scan004 | |
| Notice regarding a defective 20HP Exide Battery with a faulty cell for chassis No.GYK-40. | 29th Dec 1926 | Box 57 \ 2 Scan005 | |
| Battery discharge test chart for an Exide battery from chassis GYK-40. | 6th Jan 1927 | Box 57 \ 2 Scan006 | |
| The condition and testing of an Exide battery from a 20 HP car, chassis GYK.40. | 6th Jan 1927 | Box 57 \ 2 Scan007 | |
| Faulty Exide battery from a 20 HP vehicle, chassis GYK.40. | 8th Jan 1927 | Box 57 \ 2 Scan008 | |
| Quoting a report from the Chloride Electrical Storage Co. Ltd. on a battery test for chassis GYK-40. | 21th Feb 1927 | Box 57 \ 2 Scan009 | |
| Status of a 20-HP Exide Battery from chassis GYK-40, which is undergoing testing by Chloride Electrical Storage Co. Ltd. | 3rd Feb 1927 | Box 57 \ 2 Scan010 | |
| Investigation and resolution of a faulty battery cell for chassis GYK.40. | 23th Feb 1927 | Box 57 \ 2 Scan011 | |
| Correspondence quoting the battery supplier 'Chloride' regarding the satisfactory condition of a returned battery from chassis GYK-40. | 1st Mar 1927 | Box 57 \ 2 Scan012 | |
| Follow-up letter regarding a maker's report on a faulty 12-volt battery for Chassis No. GRK-26. | 28th Oct 1927 | Box 57 \ 2 Scan013 | |
| Letter from Peto and Radford discussing a battery fault diagnosis and its history across multiple chassis. | 27th Oct 1927 | Box 57 \ 2 Scan014 | |
| Letter from Peto and Radford discussing battery failures and inadequate dynamo outputs on chassis GAK-54, GNK-30, and GRK-26. | 15th May 1929 | Box 57 \ 2 Scan015 | |
| Letter to a customer regarding ignition trouble and the supply of a new coil and ballast resistance for a 20 HP car. | 15th May 1929 | Box 57 \ 2 Scan016 | |
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