| Description | Date | Identifier | |
| Requesting information on car 21-G-IV's foreign test with smaller wheels and expressing concerns about engine fuss on the 20/25 model. | 29th Apr 1935 | Box 101 \ 4 scan0034 | |
| List of new electrical equipment features to be fitted to car 21.G.IV for France. | 30th Apr 1935 | Box 101 \ 4 scan0035 | |
| Specifications and prioritization for the '15,000 Miles Cars' program, including details for a specific car (21-G-IV) and Bentley models. | 3rd May 1935 | Box 101 \ 4 scan0036 | |
| Issues with brake shoes and an axle, and proposed modifications for a Spectre car. | 3rd May 1935 | Box 101 \ 4 scan0037 | |
| Status update on various engineering schemes and detail drawings for the 20/25 HP car. | 8th May 1935 | Box 101 \ 4 scan0038 | |
| Note concerning the geared starter motor and the fitting of a Bentley lower half crankcase and clutch casing. | 8th May 1935 | Box 101 \ 4 scan0039 | |
| The delay of car 21-G-IV's departure to France and plans for fitting a noise insulation scheme. | 9th May 1935 | Box 101 \ 4 scan0040 | |
| Omission of the RR-Marles steering column and controls from the 21-G-IV specification. | 9th May 1935 | Box 101 \ 4 scan0041 | |
| Instructions on refitting reconditioned road springs with alterations to retain ground clearance with smaller wheels. | 9th May 1935 | Box 101 \ 4 scan0042 | |
| Status update on five urgently required items for the 21-G-IV 10,000 miles test. | 9th May 1935 | Box 101 \ 4 scan0043 | |
| Items causing delays and other proposed modifications for a car build. | 9th May 1935 | Box 101 \ 4 scan0044 | |
| Highlighting the hypoid gear axle and Marles steering as critical, delayed items for a 10,000 miles test. | 10th May 1935 | Box 101 \ 4 scan0045 | |
| Request for particulars of road springs for Chassis 21-G-IV during its 15,000 miles trials. | 14th May 1935 | Box 101 \ 4 scan0046 | |
| Instruction to re-fit reconditioned road springs for a 15,000 miles test. | 15th May 1935 | Box 101 \ 4 scan0047 | |
| Requesting an approximate date for a car to be ready for France and clarifying the purpose of a test. | 29th May 1935 | Box 101 \ 4 scan0048 | |
| Requesting specifications for the flywheel and clutch on chassis 21-G-IV, highlighting a delay in completion. | 30th May 1935 | Box 101 \ 4 scan0049 | |
| Delay in car completion due to issues with the rear axle forgings. | 3rd Jun 1935 | Box 101 \ 4 scan0050 | |
| Proposed specification alterations for the C-14 Unit clutch following a 10,000-mile test. | 4th Jun 1935 | Box 101 \ 4 scan0051 | |
| Request for a specification of special features for vehicle 21-G-IV for use on the Continent. | 2nd Jul 1935 | Box 101 \ 4 scan0052 | |
| Requesting a definitive date for a car to be sent to France. | 3rd Jul 1935 | Box 101 \ 4 scan0053 | |
| Arranging the test of car 21-G-IV at the Barnett by-pass, noting the change speed lever is yet to be fitted. | 8th Jul 1935 | Box 101 \ 4 scan0054 | |
| Car's disappointing performance, the potential fitting of 17' wheels, and plans for comparative testing. | 10th Jul 1935 | Box 101 \ 4 scan0055 | |
| Inquiry regarding the despatch of a car to France after having Lucas hydraulic jacks fitted. | 17th Jul 1935 | Box 101 \ 4 scan0056 | |
| Short memo about 'E' taking 21-G-IV to France for a holiday. | 18th Jul 1935 | Box 101 \ 4 scan0057 | |
| Spectre Radiator matrix and the development of the Large Bore Bentley and 20/25 models. | 24th Jul 1935 | Box 101 \ 4 scan0058 | |
| Request for a complete list of new features for car 21-G-IV which was sent to France. | 29th Jul 1935 | Box 101 \ 4 scan0059 | |
| Final specification for a car following a 10,000 miles test, detailing engine and chassis components. | 30th Jul 1935 | Box 101 \ 4 scan0060 | |
| Bonnet tests recording average temperatures of carburettor air intake, oil, water, and dash at various speeds. | 31th Jul 1934 | Box 101 \ 4 scan0061 | |
| Staff schedules and work instructions for cars 'Spectre' and '21-G-IV' in France. | 7th Aug 1935 | Box 101 \ 4 scan0062 | |
| Confirmation of a telegram requesting Dunlop tyres and tubes for car 21 G IV. | 14th Aug 1935 | Box 101 \ 4 scan0063 | |
| Failure of wheel spokes on Spectre road wheels and a gear lever issue. | 14th Aug 1935 | Box 101 \ 4 scan0064 | |
| Multiple mechanical faults on vehicle 21.G.IV after arrival at Chateauroux. | 15th Aug 1935 | Box 101 \ 4 scan0065 | |
| Mechanical and bodywork faults found on a vehicle. | 15th Aug 1935 | Box 101 \ 4 scan0066 | |
| Test results for carburetter intake air and under-bonnet temperatures for the S.S. I. SPECTRE model. | 15th Aug 1935 | Box 101 \ 4 scan0067 | |
| The cause of a sticking change speed lever, due to a design and fitting issue. | 16th Aug 1935 | Box 101 \ 4 scan0068 | |
| Letter regarding the dispatch of shorter replacement hydraulic jacks for a vehicle. | 19th Aug 1935 | Box 101 \ 4 scan0069 | |
| Request to supply leather washers for the propeller shaft mechanics joints on vehicle 21-G-IV. | 19th Aug 1935 | Box 101 \ 4 scan0070 | |
| Request for replacement parts for a faulty isolated change gear lever on model 21-G-IV. | 20th Aug 1935 | Box 101 \ 4 scan0071 | |
| Letter to G.W. Hancock regarding a problem with an isolated change gear lever on model 21-G-IV. | 20th Aug 1935 | Box 101 \ 4 scan0072 | |
| Short memo regarding '2I.G.IV' not running and a lack of manpower for issues with the 'Spectre'. | 20th Aug 1935 | Box 101 \ 4 scan0073 | |
| Requesting a drawing for a change speed lever and connection, noting the shaft is soft. | 22th Aug 1935 | Box 101 \ 4 scan0074 | |
| Requesting a drawing for a change speed lever and connection, noting the job takes 4 hours. | 22th Aug 1935 | Box 101 \ 4 scan0075 | |
| Faults with the change speed lever and silencer for vehicle 2I. G. IV. | 24th Aug 1935 | Box 101 \ 4 scan0076 | |
| Letter to a customer regarding a drawing and replacement parts for an isolated change speed lever. | 26th Aug 1935 | Box 101 \ 4 scan0077 | |
| Mechanical adjustments to the propeller shaft, gearbox, and jacks, with notes on engine performance. | 26th Aug 1936 | Box 101 \ 4 scan0078 | |
| Jamming change speed lever on 2I.G.IV, caused by a scored and unhardened shaft. | 26th Aug 1935 | Box 101 \ 4 scan0079 | |
| Sticking change speed lever, attributing the issue to incorrect shaft hardening and insufficient ball cage clearance. | 27th Aug 1935 | Box 101 \ 4 scan0080 | |
| Letter from Chateauroux, France, requesting parts for a car, detailing specific component failures. | 30th Aug 1935 | Box 101 \ 4 scan0081 | |
| Drawing of a Jackall junction box showing a point of failure. | 30th Aug 1935 | Box 101 \ 4 scan0082 | |
| Letter to S. Smith & Sons Ltd. requesting a replacement for a broken 'Jackall' junction box union. | 2nd Sep 1935 | Box 101 \ 4 scan0083 | |
| Reviewing the results of a 10,000-mile vehicle test, focusing on performance, steering, and axle quietness. | 3rd Sep 1935 | Box 101 \ 4 scan0084 | |
| From Sg. to Hs. requesting a report on a car used during a holiday. | 3rd Sep 1935 | Box 101 \ 4 scan0085 | |
| From France detailing the failure of an exhaust valve and the subsequent damage and repair. | 4th Sep 1935 | Box 101 \ 4 scan0086 | |
| Modifications to Spectre Marles steering on a 25 HP car to reduce joggles. | 4th Sep 1935 | Box 101 \ 4 scan0087 | |
| Dispatch note confirming parts sent to G.W. Hancock in France for chassis 21-G-IV. | 5th Sep 1935 | Box 101 \ 4 scan0088 | |
| The engine rebuild and other improvements for car 21.G.IV. | 5th Sep 1935 | Box 101 \ 4 scan0089 | |
| Telegram regarding the anticipated failure of Silechrome exhaust valves and a request for a report. | 6th Sep 1935 | Box 101 \ 4 scan0090 | |
| Exhaust valve material issues, specifically lead attack and stretching, on the 20/25 model. | 6th Sep 1935 | Box 101 \ 4 scan0091 | |
| Performance and testing of KE-965 and silichrome valves. | 6th Sep 1935 | Box 101 \ 4 scan0092 | |
| The condition of exhaust valves following a telegram request. | 6th Aug 1935 | Box 101 \ 4 scan0093 | |
| Engine performance, steering, axle noise, and gearbox issues on vehicle 21-G-IV. | 7th Sep 1935 | Box 101 \ 4 scan0094 | |
| The failure of Lucas wind horn brackets and the subsequent redesign for the 20/25 chassis. | 7th Sep 1935 | Box 101 \ 4 scan0095 | |
| The inspection of a cylinder head and valves, detailing issues found and requesting spare parts. | 7th Sep 1935 | Box 101 \ 4 scan0096 | |
| Broken exhaust valve, its discovery, and the status of other components. | 8th Sep 1935 | Box 101 \ 4 scan0097 | |
| Fitting a head, replacing valves, and a request for steering box compound for car 21. G. IV. | 12th Sep 1935 | Box 101 \ 4 scan0098 | |
| Letter concerning fuel instructions for car 21-G-IV, issues with a Spectre, and mileage concerns. | 16th Sep 1935 | Box 101 \ 4 scan0099 | |
| Damage to a fan bracket, water thermometer, and a punctured tank on a vehicle. | 17th Sep 1935 | Box 101 \ 4 scan0100 | |
| Typed telegram with instructions for personnel and logistics in France. | 21th Sep 1935 | Box 101 \ 4 scan0101 | |
| Plans to recall car 21-G-1V from France to Derby for steering tests and fitting a new big bore 25 HP engine. | 21th Sep 1935 | Box 101 \ 4 scan0102 | |
| Request to prepare sets of stellited exhaust and inlet valves for the Spectre and 20/25 HP engines. | 23th Sep 1935 | Box 101 \ 4 scan0103 | |
| The availability and allocation of three Big Bore 20/25's standard centres blocks. | 23th Sep 1935 | Box 101 \ 4 scan0104 | |
| From Sg. to Hs. concerning the use of an engine intended for one car to be put into car 21-G-IV instead. | 23th Sep 1935 | Box 101 \ 4 scan0105 | |
| Listing the serial numbers of six Dunlop tyres fitted to vehicle 21.G.IV. | 24th Sep 1935 | Box 101 \ 4 scan0106 | |
| Listing the serial numbers for 10 Dunlop tyres received at Chateauroux. | 25th Sep 1935 | Box 101 \ 4 scan0107 | |
| Letter regarding the numbers of received tyres, coke for the garage, and altered travel arrangements. | 25th Sep 1935 | Box 101 \ 4 scan0108 | |
| Relocating steering experiments for car 21-G-IV from France to the Works. | 26th Sep 1935 | Box 101 \ 4 scan0109 | |
| To the Accounts Department providing the numbers for two further tyres. | 26th Sep 1935 | Box 101 \ 4 scan0110 | |
| Instructions for modifying a Large Bore 20/25 Unit for test 21-G-IV. | 30th Sep 1935 | Box 101 \ 4 scan0111 | |
| Urgent query regarding a 20/25 Limousine, chassis GAE-20, available without an engine for experimental purposes. | 30th Sep 1935 | Box 101 \ 4 scan0112 | |
| Confirming a car has been examined and is suitable for a 10,000 miles test. | 2nd Oct 1935 | Box 101 \ 4 scan0113 | |
| Suggestion to replace a gearbox on a chassis after 40,000 miles. | 7th Oct 1935 | Box 101 \ 4 scan0114 | |
| Results and issues found during the testing of the 'Jackall' Hydraulic Jacking System. | 7th Oct 1935 | Box 101 \ 4 scan0115 | |
| Failures and issues with the 'Jackall' jacking system's pressure pump and jacks. | 3rd Oct 1935 | Box 101 \ 4 scan0116 | |
| Report summary on an unsatisfactory system, mentioning a specific junction box failure and replacement. | 3rd Oct 1935 | Box 101 \ 4 scan0117 | |
| Diagram showing the layout and operation of a Jackall pressure pump valve. | 21th Oct 1935 | Box 101 \ 4 scan0118 | |
| Requesting the alteration of No.1 gear for steering experiments on vehicle 21-G-IV. | 21th Oct 1935 | Box 101 \ 4 scan0119 | |
| Summary of steering experiment results for chassis 21-G-IV, detailing three modifications and their performance. | 26th Oct 1935 | Box 101 \ 4 scan0120 | |
| Proposing further steering geometry modifications and tests to correct oversteering and wandering. | 26th Oct 1935 | Box 101 \ 4 scan0121 | |
| Requesting an up-to-date list of items being tested on a car with a big bore engine for standardization. | 31th Oct 1935 | Box 101 \ 4 scan0122 | |
| Brief specification of parts for a 15,000-mile test on vehicle 21-G-IV. | 5th Nov 1935 | Box 101 \ 4 scan0123 | |
| Specification of modifications for car 21-G-IV in preparation for a 15,000 miles test. | 5th Nov 1935 | Box 101 \ 4 scan0124 | |
| Letter discussing Bentley vehicle testing, tyres, and engine valve conditions in France. | 5th Nov 1935 | Box 101 \ 4 scan0125 | |
| Request to detail and make two modified sets of flexible bladed Cadillac-type fans and adaptors. | 6th Nov 1935 | Box 101 \ 4 scan0126 | |
| Request to make a custom air silencer and intake bend for a 21-G-IV car for France. | 6th Nov 1935 | Box 101 \ 4 scan0127 | |
| Schedule for a 15,000-mile car test. | 7th Nov 1935 | Box 101 \ 4 scan0128 | |
| Instruction to fit an experimental 25 HP unit No. B-15 with 45° helix angle timing gears for testing in France. | 11th Nov 1935 | Box 101 \ 4 scan0129 | |
| Brief memo regarding a delay on project 21-G-IV due to obtaining better metal bearings and issues with adhesion. | 13th Nov 1935 | Box 101 \ 4 scan0130 | |
| To RHC listing a backlog of cars and jobs waiting for the shop. | 14th Nov 1935 | Box 101 \ 4 scan0131 | |
| The 25-29 HP Engine, detailing drawings for an air cleaner, silencer, rocker cover modifications and ignition parts. | 16th Nov 1935 | Box 101 \ 4 scan0132 | |
| Follow-up memo requesting a reply about the expected date a car will be sent to France. | 19th Nov 1935 | Box 101 \ 4 scan0133 | |
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