| Description | Date | Identifier | |
| New features for the 'T' Series 20/25 HP car to be tested in France. | 21th May 1931 | Box 5a \ 3 03-page003 | |
| Recommendation to carry spare low rating front springs for the 25 HP model due to anticipated breakages on bad roads. | 17th Jun 1931 | Box 5a \ 3 03-page004 | |
| List of parts to be fitted to vehicle model 19-G4 for tests in France. | 18th Jul 1931 | Box 5a \ 3 03-page005 | |
| Letter discussing shock absorber loading, exhaust valves, and parts development for the 25 HP and 25-EX models. | 21th Jul 1931 | Box 5a \ 3 03-page006 | |
| Alteration to a radiator for a 10,000-mile test car. | 23th Jul 1931 | Box 5a \ 3 03-page007 | |
| Car's 10,000-mile test in France and the fitting of a 'camouflage' radiator apron. | 1st Aug 1931 | Box 5a \ 3 03-page008 | |
| Request to instruct the creation of a manifold for a new exhaust system on car 19-GIV ahead of a 10,000-mile test. | 7th Aug 1931 | Box 5a \ 3 03-page009 | |
| Inquiring about the progress and anticipated test commencement date for a car in France. | 7th Aug 1931 | Box 5a \ 3 03-page010 | |
| Modifications to car 12-GIV and its subsequent itinerary. | 19th Aug 1931 | Box 5a \ 3 03-page011 | |
| Accident damage report for a car detailing a dented wing and a buckled front spring, with an internal request for a replacement spring. | 19th Aug 1931 | Box 5a \ 3 03-page012 | |
| The initial mileage testing and driving impressions of a car, including details of a meeting regarding modifications. | 18th Aug 1932 | Box 5a \ 3 03-page013 | |
| Design critiques and discussions on components like the front apron, rear screen, and torque reaction dampers. | 22th Aug 1931 | Box 5a \ 3 03-page014 | |
| Requesting the preparation and despatch of low rating springs for 19-GIV, noting a required repair on a shackle pin bush. | 22th Aug 1931 | Box 5a \ 3 03-page015 | |
| Examination of car shock dampers, detailing issues with valve holes, connecting links, and steering. | 24th Aug 1931 | Box 5a \ 3 03-page016 | |
| Responding to issues with drilled shock damper valves and arranging for the replacement of front springs on car 19-04. | 27th Aug 1931 | Box 5a \ 3 03-page017 | |
| The examination of holes in shock damper L.S. valves and the trial of new front springs. | 29th Aug 1931 | Box 5a \ 3 03-page018 | |
| Minor vehicle examination detailing issues with dampers, radiator, engine, and bodywork. | 31th Aug 1937 | Box 5a \ 3 03-page019 | |
| Confirming a telegram sent from Chateauroux, France, regarding an arrived modification. | 7th Sep 1931 | Box 5a \ 3 03-page020 | |
| Bijur cane failure and subsequent vehicle modifications in Chateauroux, France. | 2nd Sep 1931 | Box 5a \ 3 03-page021 | |
| Report discussing the failure of an exhaust manifold and proposing a new design with a cast iron silencer box. | 3rd May 1917 | Box 5a \ 3 03-page022 | |
| Test report on dynamo output showing amperage readings at various speeds and electrical loads. | 3rd Mar 1931 | Box 5a \ 3 03-page023 | |
| Report listing sixteen specific failures on a test car, questioning the advisability of continuing its run. | 1st Jan 1931 | Box 5a \ 3 03-page024 | |
| Message confirming the receipt of new front road springs for car 10.J.Y. and asking if they need to be fitted immediately. | 5th Sep 1931 | Box 5a \ 3 03-page025 | |
| Telecalamite failure and Clutch slipping issues with proposed remedies. | 4th Feb 1931 | Box 5a \ 3 03-page026 | |
| Letter concerning a Bijur pump failure (19-GIV) caused by a shrinking cork washer and proposing a solution. | 8th Sep 1931 | Box 5a \ 3 03-page027 | |
| Various component failures observed during a 10,000-mile vehicle test in France. | 1st Sep 1931 | Box 5a \ 3 03-page028 | |
| Comments on a report regarding criticisms of a 25 HP car after 8,000 miles. | 15th Sep 1931 | Box 5a \ 3 03-page029 | |
| Vehicle 19.G.IV at 8,000 miles, detailing engine, piston, and valve performance. | 11th Sep 1931 | Box 5a \ 3 03-page030 | |
| Modifications and performance of a flywheel, clutch, gearbox, servo motor, and exhaust fittings. | 9th Feb 1921 | Box 5a \ 3 03-page031 | |
| Failures of the exhaust manifold, exhaust silencer, and fan during mileage tests. | 9th Feb 1921 | Box 5a \ 3 03-page032 | |
| Performance tests and faults found in the radiator, bonnet, and steering column. | 9th Feb 1921 | Box 5a \ 3 03-page033 | |
| Technical report on the performance and condition of steering, axle, brake, and universal joint components. | 9th Feb 1921 | Box 5a \ 3 03-page034 | |
| Failures and conditions of vehicle components including lubrication, springs, and brakes. | 9th Feb 1921 | Box 5a \ 3 03-page035 | |
| Modifications to relief valve seatings and failures of the telegage, bijur tank, and windscreen wiper. | 9th Feb 1921 | Box 5a \ 3 03-page036 | |
| Vehicle condition report detailing issues and performance of engine guards, bodywork, electricals, and a summary of consumption and mileage. | 16th Sep 1931 | Box 5a \ 3 03-page037 | |
| Analysis of an engine failure caused by a loss of exhaust valve clearance. | 16th Sep 1931 | Box 5a \ 3 03-page038 | |
| Hand-drawn diagram illustrating the seating and contact points of an exhaust valve. | 19th Mar 1931 | Box 5a \ 3 03-page039 | |
| Test report on Bourdon shutters, recording air and water temperatures at 40 and 60 M.P.H. with shutters open and closed. | 19th Mar 1931 | Box 5a \ 3 03-page040 | |
| Inquiring about the return date of a car for mileage testing. | 16th Sep 1931 | Box 5a \ 3 03-page041 | |
| Typed letter from Hs/GWH to A.B. Roberts regarding a test report, an exhaust manifold, and travel arrangements. | 23th Sep 1931 | Box 5a \ 3 03-page042 | |
| Responding to a query about the completion date for work on car 19-G4. | 23th Sep 1931 | Box 5a \ 3 03-page043 | |
| Handover of a car in response to a previous query. | 19th Sep 1931 | Box 5a \ 3 03-page044 | |
| Clarifying the readiness of a car for a mileage run and its operational schedule. | 19th Sep 1934 | Box 5a \ 3 03-page045 | |
| Extension of mileage tests to 15,000 miles and a query about why a specific car's handover was not carried out as arranged. | 29th Sep 1931 | Box 5a \ 3 03-page046 | |
| Continuing the 10,000-mile tests at Chateauroux on to 15,000 miles, rather than running them in England. | 30th Sep 1931 | Box 5a \ 3 03-page047 | |
| Request for the return date of a car to England for further mileage testing. | 16th Sep 1931 | Box 5a \ 3 03-page048 | |
| Communication to Mr. Hancock in France regarding the arrival and trial of a car before it is overhauled. | 30th Sep 1931 | Box 5a \ 3 03-page049 | |
| Telegram from Hancock advising that a car will arrive in Derby on Monday. | 30th Jun 1934 | Box 5a \ 3 03-page050 | |
| Short telex message to Mr. Hancock in Chateauroux, France, regarding his expected return. | 1st Oct 1931 | Box 5a \ 3 03-page051 | |
| Procedure and timing for a mileage examination and final dismantling. | 2nd Oct 1931 | Box 5a \ 3 03-page052 | |
| Cover memo for a report on 19-G4 after 15,000 miles running in France, with comments on failures. | 7th Oct 1931 | Box 5a \ 3 03-page053 | |
| The 19.3.IV model at 15,000 miles, detailing performance comparisons and a list of failures. | 30th Sep 1931 | Box 5a \ 3 03-page054 | |
| The condition of Engine Unit No. C.10 after 7,000 miles, detailing issues with valve seats, ignition, and pistons. | 30th Sep 1931 | Box 5a \ 3 03-page055 | |
| Performance and issues found with the flywheel, clutch, gearbox, servo motor, and exhaust fittings. | 30th Sep 1931 | Box 5a \ 3 03-page056 | |
| Condition report on vehicle components including the silencer, fan, radiator, and bonnet. | 30th Sep 1931 | Box 5a \ 3 03-page057 | |
| The performance of the steering column, propeller shaft, and rear axle components under test conditions. | 30th Sep 1931 | Box 5a \ 3 03-page058 | |
| Condition and performance of the brake systems, front axle, hubs, and front road springs. | 30th Sep 1931 | Box 5a \ 3 03-page059 | |
| The condition and performance of chassis components including springs, dampers, and a telegauge. | 30th Sep 1931 | Box 5a \ 3 03-page060 | |
| The performance of various vehicle components including the Bijur tank, Lucas windscreen wiper, and electrical systems. | 30th Sep 1931 | Box 5a \ 3 03-page061 | |
| Vehicle condition report detailing the starter motor, petrol tank, bodywork, and performance statistics. | 7th Oct 1931 | Box 5a \ 3 03-page062 | |
| List of comments on various failures identified in the 19-34 car model. | 7th Oct 1931 | Box 5a \ 3 03-page063 | |
| Battery ignition and exhaust valve failures, with proposed remedies. | 7th Jan 1911 | Box 5a \ 3 03-page064 | |
| Photograph showing four tyres worn down to the canvas. | 5th Nov 1931 | Box 5a \ 3 03-page065 | |
| Follow-up report inquiring about fixes for component failures on vehicle 19-G1 after 15,000 miles. | 5th Nov 1931 | Box 5a \ 3 03-page066 | |
| 15,000-mile test report on car 19-G4, covering issues with front wheel wobbling, brakes, clutch, and other components. | 10th Nov 1931 | Box 5a \ 3 03-page067 | |
| The condition of engine components from an 18-GIV model after a 10,000-mile test. | 1st Dec 1931 | Box 5a \ 3 03-page068 | |
| Vehicle inspection report detailing findings on the flywheel, clutch, chassis, and suspension components. | 31th Dec 1931 | Box 5a \ 3 03-page069 | |
| Inspection report detailing faults and conditions of the rear axle, propeller shaft, pedals, and gearbox. | 1st Dec 1931 | Box 5a \ 3 03-page070 | |
| Diagram of a 25 HP Rear Brake Actuating Shaft. | 17th Dec 1931 | Box 5a \ 3 03-page071 | |
| Table detailing cylinder bore diameter and wear measurements after 15,000 miles. | 17th Dec 1931 | Box 5a \ 3 03-page072 | |
| Diagram illustrating an issue with exhaust valves hammering into the guide seating and the required alteration. | 25th Nov 1931 | Box 5a \ 3 03-page073 | |
| Photograph displaying two rows of main and connecting rod bearing shells. | 26th Aug 1931 | Box 5a \ 3 03-page074 | |
| Hand-drawn graph of ice water and air temperatures from standardised crankcase studies. | 26th Aug 1931 | Box 5a \ 3 03-page075 | |
| Blank document with a handwritten notation in the top right corner. | 12th Oct 1931 | Box 5a \ 3 03-page076 | |
| Requesting an update on the status of a 10,000 miles test. | 12th Oct 1931 | Box 5a \ 3 03-page077 | |
| Modifications and testing of a car, including the crankshaft, flywheel, and valve shape. | 14th Oct 1931 | Box 5a \ 3 03-page078 | |
| Comments on a vehicle's performance after a 10,000-mile test. | 15th Oct 1931 | Box 5a \ 3 03-page079 | |
| Vehicle test report noting issues with steering, exhaust, axle, and other components. | 15th Oct 1931 | Box 5a \ 3 03-page080 | |
| Test report to determine the optimal ignition timing for a 10,000-mile test car on Ticknall Hill. | 26th Oct 1931 | Box 5a \ 3 03-page081 | |
| Listing parts for the 'T' series that are still under experimentation and held up from production. | 29th Oct 1931 | Box 5a \ 3 03-page082 | |
| Arrangements for a meeting and car delivery related to a new type 25 HP petrol tank. | 4th Nov 1931 | Box 5a \ 3 03-page083 | |
| Arranging a meeting at Brooklands to test a car's speed and handling characteristics. | 4th Nov 1931 | Box 5a \ 3 03-page084 | |
| Log of vehicle performance tests and adjustments, focusing on noise, vibration, and component settings. | 4th Oct 1931 | Box 5a \ 3 03-page085 | |
| Test report on a Phantom II type front expansion box, clutch performance, engine rattles, and various exhaust system configurations. | 4th Nov 1931 | Box 5a \ 3 03-page086 | |
| Sending lighter crankshaft balance weights to France for testing on car 18-G.4 to address a torsional period issue. | 6th Nov 1931 | Box 5a \ 3 03-page087 | |
| The braking performance of the 20/25HP chassis, discussing front wheel braking, servo inefficiency, and contamination of friction surfaces. | 6th Nov 1931 | Box 5a \ 3 03-page088 | |
| Brake test results and buffer clearance measurements. | 7th Nov 1931 | Box 5a \ 3 03-page089 | |
| 10,000-mile test on a 25 HP chassis, requesting data on clutch pedal pressure. | 1st Nov 1931 | Box 5a \ 3 03-page090 | |
| Failed speedometer for chassis 18-G-IV and a request for a replacement. | 9th Nov 1931 | Box 5a \ 3 03-page091 | |
| The performance of car 10.G.IV upon arrival in Chateauroux, and an update on the overhaul of car 24-EX in Paris. | 11th Nov 1931 | Box 5a \ 3 03-page092 | |
| From Chateauroux, France, regarding found washleather gloves, anti-freezing mixture, and clutch pedal load tests. | 12th Nov 1931 | Box 5a \ 3 03-page093 | |
| Resolving noise from a front shock damper filter and addressing engine mounting imbalance. | 13th Nov 1931 | Box 5a \ 3 03-page094 | |
| Progress report on mileage testing for vehicle 18.G.IV, detailing engine, damper, and transmission performance. | 14th Nov 1931 | Box 5a \ 3 03-page095 | |
| Acceleration test results for vehicle 18.G.IV, detailing times between various speeds. | 14th Nov 1931 | Box 5a \ 3 03-page096 | |
| Letter discussing shock absorbers, diamond engine mounting, performance trials, and exhaust systems. | 6th Nov 1931 | Box 5a \ 3 03-page097 | |
| Progress report on vehicle testing, discussing issues with the slipper wheel and gearbox. | 16th Nov 1931 | Box 5a \ 3 03-page098 | |
| Bijur supply pipe failure on a front axle, with a suggestion for redesign. | 16th Nov 1931 | Box 5a \ 3 03-page099 | |
| Pencil sketch and notes detailing the failure of the Bijur lubrication supply to a front axle. | 16th Nov 1931 | Box 5a \ 3 03-page100 | |
| Dynamo output, steering issues, and performance tests for specific vehicles. | 16th Nov 1931 | Box 5a \ 3 03-page101 | |
| Typed memo sent to G.W. Hancock in France regarding Christmas work arrangements for his men and a car. | 16th Nov 1931 | Box 5a \ 3 03-page102 | |
| | | | |
