| Description | Date | Identifier | |
| Letter detailing car performance improvements and speed trial results at Brooklands after fitting a Bosch Magneto. | 30th Sep 1921 | Box 47 \ 1 Scan054 | |
| Letter from Geoffrey Summers discussing the car's racing potential and the need for engine modifications to compete with other manufacturers. | 11th Oct 1921 | Box 47 \ 1 Scan055 | |
| Modifications to increase the speed of chassis 39.TW for Mr. Geoffrey Summers, focusing on ignition, engine power, and aerodynamics. | 11th Oct 1921 | Box 47 \ 1 Scan056 | |
| Continued memorandum discussing high-speed modifications for a chassis, including engine compression, fuel mix, suspension, and wheels. | 11th Oct 1921 | Box 47 \ 1 Scan057 | |
| Letter outlining the policy against participating in races in response to an inquiry about chassis 39-TW for Mr. Geoffrey Summers. | 14th Oct 1921 | Box 47 \ 1 Scan058 | |
| The supplying and fitting of small fan pulleys on cars, specifically for the Duke of Alba's car No. 65.CW. | 15th Oct 1921 | Box 47 \ 1 Scan059 | |
| Chasing a reply regarding charges for Chassis 39-TW. | 18th Oct 1921 | Box 47 \ 1 Scan060 | |
| Letter from Madrid to London detailing client complaints about engines overheating and chassis springs bottoming out. | 5th Nov 1921 | Box 47 \ 1 Scan061 | |
| Proposed meeting in Derby to discuss a battery issue. | 22th Nov 1921 | Box 47 \ 1 Scan062 | |
| Copy of a customer letter praising car performance at Brooklands and the Isle of Man, particularly the Hartford shock absorbers. | 5th Jul 1922 | Box 47 \ 1 Scan063 | |
| Axle modifications for the Earl of Rocksavage's new chassis to meet performance expectations. | 28th Aug 1922 | Box 47 \ 1 Scan064 | |
| Mr. Taaffe's upcoming arrival in Derby with his car, chassis 34-KG. | 20th Nov 1922 | Box 47 \ 1 Scan065 | |
| Customer feedback letter regarding chassis 46-FW performance on a European tour, including issues with loose spokes and radiator shutters. | 28th May 1922 | Box 47 \ 1 Scan066 | |
| Persistent fault where grit gets wedged between the revolving brake drum and its sheet-metal guard. | 2nd Jun 1923 | Box 47 \ 1 Scan067 | |
| Continued memo suggesting a modification to the drums and shields of a car to match the 20 HP model. | 5th Jul 1923 | Box 47 \ 1 Scan068 | |
| The examination of Chassis No. 119-FW belonging to W.W. Worthington Esq. | 5th Jul 1923 | Box 47 \ 1 Scan069 | |
| Letter to W.W. Worthington Esq. regarding chassis 119-FW and arranging an inspection. | 4th Jul 1923 | Box 47 \ 1 Scan070 | |
| Customer letter detailing the excellent performance and low carbon buildup of their car, chassis 119-FW. | 3rd Jul 1923 | Box 47 \ 1 Scan071 | |
| Declining the use of an experimental car for an outsider, citing risks to sales and brand reputation. | 4th Sep 1923 | Box 47 \ 1 Scan072 | |
| Customer complaint from Sir Connop Guthrie about the performance of his 40/50 HP Cabriolet, Chassis No. 41-NK. | 31th Jan 1924 | Box 47 \ 1 Scan073 | |
| Underperformance of a customer's car and proposed remedies for an influential owner. | 29th May 1924 | Box 47 \ 1 Scan074 | |
| Springing complaint and investigation for two 40/50 HP vehicles. | 29th May 1924 | Box 47 \ 1 Scan075 | |
| Customer feedback and tests concerning a 'dither' issue, comparing the car's ride to a Buick and discussing potential solutions. | 29th May 1924 | Box 47 \ 1 Scan076 | |
| Test report detailing 'dither' trouble, body boom, ventilation, and vibration issues, proposing further experimental investigation. | 8th Sep 1921 | Box 47 \ 1 Scan077 | |
| Analysis of suspension 'dither' and bounce issues comparing different car bodies and springs. | 8th Sep 1921 | Box 47 \ 1 Scan078 | |
| Customer's persistent engine boiling issue with Chassis No. 74-PW. | 27th Jun 1924 | Box 47 \ 1 Scan079 | |
| Customer's complaint about boiling during pass climbing in Switzerland and recommended modifications. | 26th Jun 1924 | Box 47 \ 1 Scan080 | |
| Complaint letter from a customer regarding persistent engine boiling issues with their car, model 74-FW. | 20th Jun 1924 | Box 47 \ 1 Scan081 | |
| Cover note regarding an issue with rims coming off straight-sided wheels on a 40/50 HP car, chassis 66-LK. | 16th Aug 1924 | Box 47 \ 1 Scan082 | |
| Internal correspondence regarding a complaint about S/S rims coming off Chassis 66-LK for H.H. Abbas Hilmi. | 15th Aug 1924 | Box 47 \ 1 Scan083 | |
| Translated letter from Albert Schmidt regarding wheel failures on chassis 66-LK for H.H. Abbas Hilmi. | 12th Aug 1924 | Box 47 \ 1 Scan084 | |
| Wheel flange issue on chassis 66-LK, involving customer correspondence, a solution from Dunlop, and safety considerations of different tyre types. | 18th Aug 1924 | Box 47 \ 1 Scan085 | |
| Customer complaint about car troubles due to American conditions and petrol quality. | 1st Aug 1924 | Box 47 \ 1 Scan086 | |
| Visit to Grasse, France, to inspect Chassis 60.PK owned by Mr. Schley concerning performance in mountainous terrain. | 3rd Sep 1924 | Box 47 \ 1 Scan087 | |
| Engine problems like piston knock and boiling, and proposed solutions. | 8th Sep 1924 | Box 47 \ 1 Scan088 | |
| Customer's 40/50HP chassis boiling over on Birdlip hill. | 8th Sep 1924 | Box 47 \ 1 Scan089 | |
| Customer letter reporting an overheating issue on chassis No. 33-TG after a test drive up Crickley Hill. | 6th Sep 1924 | Box 47 \ 1 Scan090 | |
| Requesting urgent design and drawings for modifications to Chassis No.75-RM for Lady Meredith. | 24th Oct 1924 | Box 47 \ 1 Scan091 | |
| Technical assessment of chassis no. 49-AE regarding boiling issues and potential modifications. | 17th Oct 1924 | Box 47 \ 1 Scan092 | |
| Ongoing issues with Chassis GAK-65, including fumes, water boiling, and oil from the propeller shaft. | 22th Oct 1924 | Box 47 \ 1 Scan093 | |
| Cover note from CWB attaching a copy of a letter sent to Messrs. Paddon. | 29th Apr 1924 | Box 47 \ 1 Scan094 | |
| Letter regarding modifications to chassis GDK-46, including a special fan, louvred bonnet, and safety concerns about the fitted Michelin Comfort tyres. | 27th Nov 1924 | Box 47 \ 1 Scan095 | |
| Letter discussing experimental modifications to a car's axle and springs, and issues with steering shudder on the front wheels. | 23th Nov 1938 | Box 47 \ 1 Scan096 | |
| Chasing the completion and despatch of a Louvred Bonnet and special Fan for chassis GAK-65. | 9th Dec 1924 | Box 47 \ 1 Scan097 | |
| Effectiveness of Houdaille shock absorbers on chassis No. 91-HG. | 22th Jan 1925 | Box 47 \ 1 Scan098 | |
| Correspondence regarding a customer complaint about uncomfortable springing and the fitting of Houdaille shock absorbers on chassis 91-HG. | 19th Jan 1925 | Box 47 \ 1 Scan099 | |
| Customer feedback letter regarding the performance of Houdaille shock absorbers on chassis No. 91-HG. | 15th Jan 1925 | Box 47 \ 1 Scan100 | |
| Unresolved 'drive groan' issue on Chassis 68-AU and the ongoing efforts to fix it. | 1st Feb 1925 | Box 47 \ 1 Scan101 | |
| Internal noise issues with a specific car, the attempts to fix it, and the potential impact on the company's reputation. | 5th Feb 1925 | Box 47 \ 1 Scan102 | |
| Issues with noisy car bodies, potential solutions, and specific customer complaints. | 5th Feb 1925 | Box 47 \ 1 Scan103 | |
| Transmission noise issues in Chassis 68-AU and proposals for resolution. | 10th Feb 1925 | Box 47 \ 1 Scan104 | |
| Letter regarding a complaint of water in the oil for a 40/50 HP chassis (95-LK) in Holland. | 21th Feb 1925 | Box 47 \ 1 Scan105 | |
| Inspection report for a 40/50 HP car, owned by Van Berkel of Rotterdam, concerning a suspected water leak in the sump. | 14th Feb 1925 | Box 47 \ 1 Scan106 | |
| Conference report regarding the decision of whether to fit an old-type spring drive coupling to car model 68-AU. | 2nd Mar 1925 | Box 47 \ 1 Scan107 | |
| Technical note discussing the reliability of a fabric coupling. | 2nd Mar 1925 | Box 47 \ 1 Scan108 | |
| Calling a meeting to decide between fitting a fabric coupling or reusing the old spring drive coupling for chassis 68-AU. | 2nd Mar 1925 | Box 47 \ 1 Scan109 | |
| The fitting of spring couplings to two cars, 68-AU and 62-AU, due to testing delays and excessive noise complaints. | 3rd Mar 1925 | Box 47 \ 1 Scan110 | |
| Decisions on spring couplings for chassis 68-AU and 62-AU. | 3rd Mar 1925 | Box 47 \ 1 Scan111 | |
| Instructions regarding parts and modifications for Spring Drive Couplings on chassis 68-AU and 62-AU. | 1st Mar 1925 | Box 47 \ 1 Scan112 | |
| Modification to spring drive couplings on chassis 68-AU and 62-AU. | 6th Mar 1925 | Box 47 \ 1 Scan113 | |
| The performance of chassis 86-EE, discussing axle gearing, tyre pressures, wheel fittings, and standardisation of parts. | 9th Mar 1925 | Box 47 \ 1 Scan114 | |
| Trip report and fault analysis for a 40/50 R.R. car named Minchin after a journey in the south of France. | 3rd Mar 1925 | Box 47 \ 1 Scan115 | |
| Page suggesting the use of 7 inch semi-balloon tyres. | 12th Mar 1925 | Box 47 \ 1 Scan116 | |
| Confirming the completion of lubrication work on the spring coupling for chassis 68 AU. | 12th Mar 1925 | Box 47 \ 1 Scan117 | |
| Re-test report on car 62-AU - MOY concerning springing improvements and a transmission groan issue. | 23th Mar 1925 | Box 47 \ 1 Scan118 | |
| Test report on car 62-AU regarding a transmission groan and spring drive coupling. | 25th Mar 1925 | Box 47 \ 1 Scan119 | |
| Suggesting a comparative road test with an exhaust cutout to investigate overheating issues on Mr. Gliksten's car. | 4th Apr 1925 | Box 47 \ 1 Scan120 | |
| Suitability and availability of Toneline oil for Chassis 67-UE in France. | 29th Apr 1925 | Box 47 \ 1 Scan121 | |
| Internal correspondence regarding a faulty foot brake pedal on the 40/50 HP (Silver Ghost) model. | 6th May 1925 | Box 47 \ 1 Scan122 | |
| Steering and braking fault on chassis 21-EM which caused the car to go off the road. | 12th May 1925 | Box 47 \ 1 Scan123 | |
| Secret and urgent memo regarding an accident involving Chassis No. 21-EM during testing. | 13th May 1935 | Box 47 \ 1 Scan124 | |
| Letter regarding a serious braking issue on Mrs Goring's chassis causing it to turn unexpectedly. | 8th May 1925 | Box 47 \ 1 Scan125 | |
| Protest against the adoption of front wheel brakes, explaining a predicted failure mode for chassis 21-EM. | 13th May 1925 | Box 47 \ 1 Scan126 | |
| Accident in France, a driver's account, and the performance of four-wheel brakes. | 13th May 1925 | Box 47 \ 1 Scan127 | |
| Potential issue with chassis 21-EM belonging to Mrs. Goring. | 16th May 1925 | Box 47 \ 1 Scan128 | |
| Telegram from Briggs to Hives regarding the return of car 'Sixty Six L M Gliksten'. | 19th Nov 1923 | Box 47 \ 1 Scan129 | |
| Memo about sending an account and referencing a previously addressed wire. | 28th May 1925 | Box 47 \ 1 Scan130 | |
| Query regarding work carried out and associated costs for chassis 66-LM, which is returning to London. | 29th May 1925 | Box 47 \ 1 Scan131 | |
| Repairs for Major Colin Cooper's car, 85-AU, including addressing vibrations and an oil leak. | 6th Jun 1925 | Box 47 \ 1 Scan132 | |
| Investigating an overheating issue with Mr. Glixten's car. | 1st Jun 1925 | Box 47 \ 1 Scan133 | |
| Page two of an experimental report discussing car performance tests under varying temperature and weight conditions. | 4th Jun 1925 | Box 47 \ 1 Scan134 | |
| Troubleshooting a misfiring issue on Chassis 41-TM and considering a conversion to a pressure system. | 2nd Jul 1925 | Box 47 \ 1 Scan135 | |
| Speedometer accuracy and maximum speed tests for car number 37-AU conducted at Brooklands. | 25th Jul 1925 | Box 47 \ 1 Scan136 | |
| Vehicle performance issues including front wheel wobble, noisy tyres, and body roll. | 12th Dec 1924 | Box 47 \ 1 Scan137 | |
| Comparison of the frontal areas of different car bodies and the estimated effect on performance. | 14th Jul 1932 | Box 47 \ 1 Scan138 | |
| Customer issues reported by Lord Montagu concerning steering column vibration, autovac overheating, and ignition lever instructions. | 17th Aug 1925 | Box 47 \ 1 Scan139 | |
| Copy of a letter from a customer detailing three issues with a new car: steering column vibration, an overheating Autovac, and a query about the automatic ignition. | 15th Aug 1925 | Box 47 \ 1 Scan140 | |
| Internal memorandum addressing customer complaints from Lord Montagu about steering rigidity and the Autovac system. | 8th Aug 1925 | Box 47 \ 1 Scan141 | |
| Continuation page detailing the normal position and use of the ignition lever. | 27th Aug 1925 | Box 47 \ 1 Scan142 | |
| Sending 'top hats' from car 38-MC Patiala and noting the completely charred condition of the exhaust felts. | 27th Aug 1925 | Box 47 \ 1 Scan143 | |
| Mr. Sidney's 'New Phantom' chassis No. 54-MC and methods of overcoming overoiling. | 11th Sep 1925 | Box 47 \ 1 Scan144 | |
| Customer's feedback on oil consumption issues with a new Phantom Open Car. | 9th Sep 1925 | Box 47 \ 1 Scan145 | |
| Internal memorandum regarding over-oiling and battery charging issues on a customer's 'New Phantom' car, No. 54-MC. | 16th Sep 1925 | Box 47 \ 1 Scan146 | |
| 'New Phantom' car, chassis 33-MC, belonging to Mr. Harrison of Birmingham. | 22th Sep 1925 | Box 47 \ 1 Scan147 | |
| Testing and standardisation of an alteration on Mr. Harrison's 'New Phantom' car, noting disappointing power loss. | 21th Sep 1925 | Box 47 \ 1 Scan148 | |
| Letter regarding a customer's complaint about a noisy exhaust on a 'New Phantom' car. | 18th Sep 1925 | Box 47 \ 1 Scan149 | |
| Serious over-oiling issue found in Car No. 11-RO belonging to Messrs. Nelson. | 24th Sep 1925 | Box 47 \ 1 Scan150 | |
| Customer complaint regarding unsatisfactory steering and the subsequent investigation and resolution. | 6th Oct 1925 | Box 47 \ 1 Scan151 | |
| Steering trouble and the fitting of front wheel brakes on chassis No. 88-HG. | 7th Oct 1925 | Box 47 \ 1 Scan152 | |
| Cover letter forwarding a customer's complaint about his new car for review and comment. | 10th Oct 1925 | Box 47 \ 1 Scan153 | |
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