| Description | Date | Identifier | |
| Telegram regarding invoices for an experimental car. | 12th May 1927 | Box 5a \ 2 02-page021 | |
| The dispatch of a 20 HP car to France, a new engine installation, and an unresolved oscillation problem. | 27th Dec 1928 | Box 5a \ 2 02-page022 | |
| Confirming the arrival and onward journey of experimental car 14-G-IV. | 29th Dec 1928 | Box 5a \ 2 02-page023 | |
| Providing an update on the 10,000 miles endurance tests of vehicles in France. | 29th Dec 1928 | Box 5a \ 2 02-page024 | |
| The mileage and testing schedule for a 20 HP car, chassis No. 14/G/4. | 31th Dec 1928 | Box 5a \ 2 02-page025 | |
| Confirming an opinion on the 20 HP model. | 1st Jan 1929 | Box 5a \ 2 02-page026 | |
| From Châteauroux detailing issues with vehicle vibration, torque reaction, and a failing exhaust manifold during testing. | 1st Jan 1929 | Box 5a \ 2 02-page027 | |
| Letter to Mr. Hancock discussing performance issues and modifications for a 20 HP car, focusing on front-end rigidity, damping, and undershields. | 4th Jan 1929 | Box 5a \ 2 02-page028 | |
| Letter concerning issues with a touring 'acquit', a request for an update, and a request for more copies of a mileage report. | 1st Jan 1929 | Box 5a \ 2 02-page029 | |
| Report from France detailing issues with an exhaust manifold, engine, and steering during mileage testing. | 8th Jan 1929 | Box 5a \ 2 02-page030 | |
| Extract from a report on the failure of an aluminium-treated exhaust manifold on car 14-G-4, which has cracked and the aluminium melted away. | 10th Jan 1929 | Box 5a \ 2 02-page031 | |
| Letter regarding the overhaul of a 20-HP car, repair of its front wings, and the dismantling of car 18-EX. | 14th Jan 1929 | Box 5a \ 2 02-page032 | |
| Results of a 10,000-mile test on a 20 HP car at Chateauroux. | 14th Jan 1929 | Box 5a \ 2 02-page033 | |
| Letter agreeing to commence S3 production, proposing a parts classification system, and discussing a central lubrication failure on model 18-EX. | 15th Jan 1929 | Box 5a \ 2 02-page034 | |
| Modifications for a 20 HP car, photographs for an 18-KX car, and an issue with mud in the rear brakes. | 15th Jan 1929 | Box 5a \ 2 02-page035 | |
| Request for a Zenith filter cover and aluminium washers for a 20-HP car, chassis 18-EX. | 15th Jan 1929 | Box 5a \ 2 02-page036 | |
| Letter discussing issues and suggestions regarding central oiling, carburation, and the vacuum pump. | 16th Jan 1929 | Box 5a \ 2 02-page037 | |
| Letter expressing concerns about the central oiling scheme and propeller shaft joints on a 20 HP car. | 8th Jan 1929 | Box 5a \ 2 02-page038 | |
| Instructions for investigation tests on a 20 HP car in Chateauroux, France, including parts to be fitted. | 19th Jan 1929 | Box 5a \ 2 02-page039 | |
| Typed memo regarding the selection of personnel for investigation work. | 21th Jan 1929 | Box 5a \ 2 02-page040 | |
| Continuation of a 7,500-mile car test in France and related tests on other vehicles in Derby. | 21th Jan 1929 | Box 5a \ 2 02-page041 | |
| Typed letter detailing investigation work on high petrol consumption, lubrication, and 'webbling' on a 20-HP car. | 21th Jan 1929 | Box 5a \ 2 02-page042 | |
| Personnel assignments for investigation work and the status of a 3.S. car repair. | 21th Jan 1929 | Box 5a \ 2 02-page043 | |
| 7,500-mile report on the IV-34 engine unit, detailing performance issues and component conditions. | 6th Jul 1908 | Box 5a \ 2 02-page044 | |
| Various component issues including piston failure, a noisy spring drive, and poor running caused by the induction pipe. | 6th Jul 1908 | Box 5a \ 2 02-page045 | |
| Test report detailing faults and observations on various vehicle components including the manifold, ignition, suspension, and pumps. | 6th Jul 1908 | Box 5a \ 2 02-page046 | |
| Faults and observations on various vehicle components including the radiator, bonnet, Autovac, clutch, and gearbox. | 6th Jul 1908 | Box 5a \ 2 02-page047 | |
| Condition and testing report on various components including the servo, pedals, propeller shaft, axles, and springs. | 6th Jul 1908 | Box 5a \ 2 02-page048 | |
| Condition report on various vehicle components after testing, including steering, dampers, and wings. | 6th Jul 1908 | Box 5a \ 2 02-page049 | |
| Test report on various vehicle components including the fan, frame, windscreen wiper, and bodywork, with final performance metrics. | 21th Jan 1929 | Box 5a \ 2 02-page050 | |
| Progress report on the 20 HP model after 10,000 miles, including operational recommendations for the Bijur pump. | 21th Jan 1929 | Box 5a \ 2 02-page051 | |
| Typed memo discussing the production, testing, and delivery schedule for experimental car models 18-EX and 19-EX. | 22th Jan 1929 | Box 5a \ 2 02-page052 | |
| Tests conducted on a 20-HP vehicle regarding issues with rear engine mounting, frame jellying, and carburettor performance at different water temperatures. | 22th Jan 1929 | Box 5a \ 2 02-page053 | |
| Progress report on the build-up of a 3.3 litre car, detailing engine and bodywork repairs. | 24th May 1955 | Box 5a \ 2 02-page054 | |
| Acknowledgement of receipt for Axle Control Dampers, Nearside Anchorage, Aluminium washers, and Zenith filter Metal Cover. | 22th Jan 1929 | Box 5a \ 2 02-page055 | |
| Progress report from Châteauroux, France, detailing engine fitting, consumption tests on a 20-HP car, and personnel updates. | 28th Jan 1929 | Box 5a \ 2 02-page056 | |
| Post Office Telegraph confirming travel arrangements from Chateauroux to Derby. | 30th Jan 1929 | Box 5a \ 2 02-page057 | |
| Telegram reporting vehicle mileage, running days, and a broken front wing stay. | 1st Jun 1929 | Box 5a \ 2 02-page058 | |
| Telegram from Chateauroux, France, requesting a new exhaust manifold. | 2nd Mar 1921 | Box 5a \ 2 02-page059 | |
| Telegram reporting suspected piston trouble and excessive crankcase pressure. | 5th Nov 1933 | Box 5a \ 2 02-page060 | |
| Telegram from Hancock in Chateauroux to Hives in Derby, regarding the status of cars 18' EX and 20' HP. | 4th Jan 1929 | Box 5a \ 2 02-page061 | |
| Post Office Telegraph form with handwritten notes regarding names, mileage and totals. | 6th Jan 1929 | Box 5a \ 2 02-page062 | |
| Telegram from Chateauroux to Hives at Roycar Derby, detailing mileage totals from Hancock. | 7th Jan 1929 | Box 5a \ 2 02-page063 | |
| Post Office Telegraph confirming mileage details from Hancock. | 9th Jan 1918 | Box 5a \ 2 02-page064 | |
| Telegram message expressing disappointment with a 20 HP car after 600 miles. | 30th Sep 1918 | Box 5a \ 2 02-page065 | |
| Post Office telegram regarding Niles 782 and a total of 6803 from Hancock. | 16th Aug 1939 | Box 5a \ 2 02-page066 | |
| Telegram from Hancock confirming that the 20 HP car has resumed running. | 11th Jul 1920 | Box 5a \ 2 02-page067 | |
| Telegram detailing mileage information for a recipient named Hancock. | 29th Jan 1929 | Box 5a \ 2 02-page068 | |
| Post Office Telegraph to Hives at Roycar Derby regarding Villes 503 from Hancock. | 16th Jan 1929 | Box 5a \ 2 02-page069 | |
| Telegram reporting mileage details from Chateauroux to Hives in Derby. | 18th Jan 1929 | Box 5a \ 2 02-page070 | |
| Telegram from Hancock to Hives reporting total 9765 for MILES 511. | 19th Oct 1944 | Box 5a \ 2 02-page071 | |
| Telegram from Chateauroux reporting the completion of a 10,000-mile test and requesting staff. | 18th Jan 1925 | Box 5a \ 2 02-page072 | |
| Post Office Telegraph regarding the mileage of twenty completed men returned to Derby. | 21th Sep 1920 | Box 5a \ 2 02-page073 | |
| Trial of a 20 HP item over a weekend, relating to a 10,000-mile report. | 1st Jan 1929 | Box 5a \ 2 02-page074 | |
| Demanding test schedule for the 20 HP chassis and arranging further tests. | 1st Jan 1929 | Box 5a \ 2 02-page075 | |
| The failure of front wing stays supporting headlamps on a 20 HP car in France. | 3rd Jan 1929 | Box 5a \ 2 02-page076 | |
| Standardisation of chassis parts for a Large Bore 20 HP Car 10-G4, due to improved performance. | 20th Aug 1929 | Box 5a \ 2 02-page077 | |
| Recommendation to alter valve stems and guides on the Large Bore 20 HP engine to prevent incorrect assembly. | 4th Oct 1929 | Box 5a \ 2 02-page078 | |
| Title page for the fifth 10,000 miles test conducted in France. | 27th Jan 1923 | Box 5a \ 2 02-page079 | |
| Planned improvements for the SS and G.4 models during ongoing trials in France. | 27th Jan 1923 | Box 5a \ 2 02-page080 | |
| Instructions concerning a 10,000 miles test for a 20 HP car, including axle strengthening and travel arrangements. | 14th Mar 1929 | Box 5a \ 2 02-page081 | |
| Inquiry regarding the status and lack of reports for the 20 HP, 10,000 Miles' Test Car. | 10th Apr 1929 | Box 5a \ 2 02-page082 | |
| Progress and feedback on a 20 HP, 10,000-mile test car. | 10th Apr 1929 | Box 5a \ 2 02-page083 | |
| Low-speed wobble on the 30 HP car, comparing it to the 20 HP model, and proposing a 10,000-mile test. | 1st Apr 1929 | Box 5a \ 2 02-page084 | |
| Unsatisfactory return of a 20 HP, 10,000-mile test car and the need to expedite mileage accumulation to test new modifications. | 18th Apr 1929 | Box 5a \ 2 02-page085 | |
| The continuation of a 10,000-mile test on a 20 HP car, delayed for modifications to the chassis. | 22th Apr 1929 | Box 5a \ 2 02-page086 | |
| The performance and suggested improvements for the 'China' 20HP test car before a 10,000-mile trial. | 5th Jun 1929 | Box 5a \ 2 02-page087 | |
| The disruption to a 20 HP car's 10,000-mile test in France due to a request for a detour to Boulogne. | 24th Sep 1929 | Box 5a \ 2 02-page088 | |
| Letter arranging the 10,000-mile test drive and further temperature tests for a 20 HP car. | 7th Jun 1929 | Box 5a \ 2 02-page089 | |
| Car's examination, detailing adjustments to springs and dampers, and noting a faulty lubricator and inaccurate speedometer. | 8th Jun 1929 | Box 5a \ 2 02-page090 | |
| Test report on the general running of a 20-HP car, detailing improvements and criticisms. | 10th Jun 1929 | Box 5a \ 2 02-page091 | |
| Cracked exhaust manifold and a broken exhaust pipe flange during a 10,000-mile test. | 12th Jun 1929 | Box 5a \ 2 02-page092 | |
| Sketch of a flanged component with a crack annotated as having gone completely around the part. | 9th Jan 1928 | Box 5a \ 2 02-page093 | |
| Cracked exhaust manifold, its temporary repair, and a request for a replacement part from Paris. | 13th Jun 1929 | Box 5a \ 2 02-page094 | |
| Requesting an investigation into the flexibility of a side spare wheel carrier for the 20 HP cars. | 4th Jun 1929 | Box 5a \ 2 02-page095 | |
| Fault with a side spare wheel carrier, concluding the issue is not the frame but the tubes and discs. | 17th Jun 1929 | Box 5a \ 2 02-page096 | |
| Travel arrangements for a 10,000-mile test on a 20/HP experimental car. | 18th Jun 1929 | Box 5a \ 2 02-page097 | |
| Unsteadiness of a spare wheel and the proposed modifications to fix the issue. | 18th Jun 1929 | Box 5a \ 2 02-page098 | |
| Drawing of a side open wheel carrier. | 18th Sep 1927 | Box 5a \ 2 02-page099 | |
| Note from Hancock regarding issues with the 20 HP spare wheel carrier, specifically whipping and potential frame torsion. | 19th Jun 1929 | Box 5a \ 2 02-page100 | |
| Modifications and remaining weaknesses in a side spare wheel carrier, suggesting a larger plate to distribute load. | 20th Jun 1929 | Box 5a \ 2 02-page101 | |
| Sketch of a slotted mechanism or fastener. | 20th Jun 1929 | Box 5a \ 2 02-page102 | |
| Schematic drawing of a fan and hub assembly with its mounting bracket. | 20th Jun 1929 | Box 5a \ 2 02-page103 | |
| Typed memo confirming logistical arrangements to complete a 10,000-mile car test. | 20th Jun 1929 | Box 5a \ 2 02-page104 | |
| Adding a wireless set to a car's customs list and requesting daily performance reports. | 1st Jun 1929 | Box 5a \ 2 02-page105 | |
| Travel arrangements to Chateauroux, France and customs procedures for transporting a wireless set. | 29th Jun 1929 | Box 5a \ 2 02-page106 | |
| Note and sketch for a 20 HP side spare wheel carrier. | 21th Jun 1929 | Box 5a \ 2 02-page107 | |
| The unsteadiness of a spare wheel fitting and proposed modifications to fix it. | 18th Jun 1929 | Box 5a \ 2 02-page108 | |
| Drawing of a side spare wheel carrier. | 21th Jun 1929 | Box 5a \ 2 02-page109 | |
| The examination of a car after a 5,000-mile test, noting the condition of the propeller shaft joints and issues with the lubrication system. | 21th Jun 1929 | Box 5a \ 2 02-page110 | |
| Telegauge failure due to an air leak, and the acquisition of a new exhaust manifold. | 22th Jun 1929 | Box 5a \ 2 02-page111 | |
| Investigating and rectifying steering and fuel starvation issues on car BI-ZX for Mr. Northey. | 23th Jun 1929 | Box 5a \ 2 02-page112 | |
| Letter addressing an air leak in a Telegage pressure line and proposing a new Claudel Hobson hand pump. | 24th Jun 1929 | Box 5a \ 2 02-page113 | |
| Letter concerning cooling tests and modifications for the 20 HP chassis in Continental conditions. | 6th Jun 1929 | Box 5a \ 2 02-page114 | |
| Modifications to shock damper lubrication and investigating fuel starvation issues. | 25th Jun 1929 | Box 5a \ 2 02-page115 | |
| From Sg. to Hs. regarding a 20 HP car in France approaching 9,000 miles. | 25th Jun 1929 | Box 5a \ 2 02-page116 | |
| Recommendations for rectifying an oil leak from the foot brake equaliser and issues with the central lubrication system. | 26th Jun 1929 | Box 5a \ 2 02-page117 | |
| Lubrication rates for plugs and steering arms, and a change in solder composition for future chassis. | 26th Jun 1929 | Box 5a \ 2 02-page118 | |
| Cooling efficiency tests conducted on hills around Clermont-Ferrand, France. | 26th Jun 1929 | Box 5a \ 2 02-page119 | |
| Road tests from France discussing weather impact, fan noise, and fuel system performance. | 27th Jun 1929 | Box 5a \ 2 02-page120 | |
| | | | |
