| Description | Date | Identifier | |
| Requesting the use of a Bentley V car for Easter. | 26th Mar 1941 | Box 83 \ 3 scan0171 | |
| The provision of an up-to-date Bentley for Easter. | 28th Mar 1941 | Box 83 \ 3 scan0172 | |
| Minutes of the last Tester's Monthly Conference. | 27th Mar 1941 | Box 83 \ 3 scan0173 | |
| Letter from The Light Production Co. Ltd. regarding the progress and challenges in manufacturing various piston types. | 17th Mar 1941 | Box 83 \ 3 scan0174 | |
| Letter from The Light Production Co. Ltd. regarding a four-week delay in machining and coordinating with Messrs. Wellworthy on piston drawings. | 27th May 1938 | Box 83 \ 3 scan0175 | |
| Letter discussing engine roughness, fuel compatibility, compression ratio, and tyre performance for the Big Bore Bentley. | 18th Oct 1935 | Box 83 \ 4 scan0001 | |
| Engine valve bounce at specific revs and poor fuel consumption issues. | 18th Oct 1935 | Box 83 \ 4 scan0002 | |
| Dispatch request for 3 pairs of S.U. carburetter needles to France for chassis B-56-BN. | 18th Oct 1935 | Box 83 \ 4 scan0003 | |
| Letter regarding sending 3 pairs of needles to improve petrol consumption for Chassis B-56-BN. | 18th Oct 1935 | Box 83 \ 4 scan0004 | |
| Specification sheet for induction system needles, detailing dimensions for current and experimental types. | 18th Oct 1935 | Box 83 \ 4 scan0005 | |
| The failure of a front bumper bar on a B. 56. BN. Bentley, detailing the cause and suggesting modifications. | 18th Oct 1935 | Box 83 \ 4 scan0006 | |
| Blueprint diagram illustrating a failure where a sheared pin allowed a stud to unscrew. | 18th Oct 1935 | Box 83 \ 4 scan0007 | |
| Hand-drawn sketch illustrating a mechanical failure of a pin and stud assembly. | 19th Oct 1935 | Box 83 \ 4 scan0008 | |
| Letter regarding the dispatch of a packing liner to reduce an engine's compression ratio for testing. | 19th Oct 1935 | Box 83 \ 4 scan0009 | |
| Front bumper bar failure on a Large Bore Bentley due to a sheared pin. | 22th Oct 1935 | Box 83 \ 4 scan0010 | |
| Test report comparing C.I. and L.B.I. carburetter needles on a Bentley 56. BN, focusing on performance and fuel consumption. | 22th Oct 1935 | Box 83 \ 4 scan0011 | |
| Test report on a B.56.BN Bentley comparing performance with two different types of needles. | 23th Oct 1935 | Box 83 \ 4 scan0012 | |
| Test report comparing the performance of different carburettor needles on a B. 56. BN. Bentley. | 24th Oct 1935 | Box 83 \ 4 scan0013 | |
| Despatch note for a flexible petrol pipe and a pair of float chambers to be sent to G.W. Hancock in France. | 25th Oct 1935 | Box 83 \ 4 scan0014 | |
| Correspondence regarding the supply of replacement parts for an induction system. | 25th Oct 1935 | Box 83 \ 4 scan0015 | |
| Locking pin failure on a Large Bore Bentley (B-56-BN) due to incorrect fitting. | 26th Oct 1935 | Box 83 \ 4 scan0016 | |
| Request for a test run on car B-56-BN with disconnected shutters to investigate temperature readings. | 26th Oct 1935 | Box 83 \ 4 scan0017 | |
| Letter from G.W.H. regarding engine detonation in a Bentley when using standard petrol. | 27th Oct 1935 | Box 83 \ 4 scan0018 | |
| Typed memorandum from France regarding engine smoothing, tyre performance, and valve bounce on a B.56.BN Bentley. | 27th Oct 1935 | Box 83 \ 4 scan0019 | |
| Letter addressing various vehicle performance issues including piston failures, oil consumption, and engine detonation. | 29th Oct 1935 | Box 83 \ 4 scan0020 | |
| Letter from C.C. Wakefield & Co. Ltd. regarding arrangements for the delivery of PATENT CASTROL XL oil to the Paris Office. | 23th Oct 1935 | Box 83 \ 4 scan0021 | |
| Engine smoothness, mounting, compression ratio, and tyre performance on Bentley cars. | 27th Oct 1935 | Box 83 \ 4 scan0022 | |
| Testing and modification of a Bentley radiator fitted with a Mark VI matrix. | 30th Oct 1935 | Box 83 \ 4 scan0023 | |
| Engine examination report for a B.56.BN Bentley, detailing issues with pistons, connecting rod bearings, and a failed petrol pipe. | 30th Oct 1935 | Box 83 \ 4 scan0024 | |
| Problem fitting an aluminum packing liner to a Bentley engine head. | 31th Oct 1935 | Box 83 \ 4 scan0025 | |
| Letter discussing the production and clutch testing of the big bore Bentley, and issues with a Spectre model. | 1st Nov 1935 | Box 83 \ 4 scan0026 | |
| Telegram requesting a decision on whether to standardise woven or moulded Bentley clutch linings. | 1st Nov 1935 | Box 83 \ 4 scan0027 | |
| Telegram received by telephone concerning parts for a Bentley, specifically a Bard and Beck plate and lining. | 2nd Nov 1935 | Box 83 \ 4 scan0028 | |
| Sent from France concerning the identification of a Bentley clutch lining as woven or moulded. | 2nd Nov 1935 | Box 83 \ 4 scan0029 | |
| 10,000-mile report on a Bentley 3.5 Litre B.56 engine, detailing performance and component wear. | 2nd Nov 1935 | Box 83 \ 4 scan0030 | |
| Inspection report detailing the condition of various engine and chassis components after a mileage test. | 2nd Nov 1935 | Box 83 \ 4 scan0031 | |
| Faults and observations on various vehicle components, including the air silencer, fan, petrol supply, and radiator. | 2nd Nov 1935 | Box 83 \ 4 scan0032 | |
| Condition report on various vehicle components including the clutch, gearbox, brakes, and axles. | 2nd Nov 1935 | Box 83 \ 4 scan0033 | |
| Faults and observations on the front axle, exhaust system, petrol tank, and road springs. | 2nd Nov 1935 | Box 83 \ 4 scan0034 | |
| Failures and fixes for hydraulic dampers, the electrical system, and the dynamo. | 2nd Nov 1935 | Box 83 \ 4 scan0035 | |
| Technical report detailing faults with a front bumper bar and the steel pannel bodywork of a vehicle. | 3rd Nov 1935 | Box 83 \ 4 scan0036 | |
| Comparative test report on different sizes of Aero Cushion India Tyres for a Bentley. | 3rd Nov 1935 | Box 83 \ 4 scan0037 | |
| Confirming the enclosure of a chart regarding Radiator Shutters Operating & Held Open for a Bentley. | 4th Nov 1935 | Box 83 \ 4 scan0038 | |
| Bentley car held up due to the rear road spring anchorage coming adrift, detailing the repairs and an ignition check. | 4th Nov 1935 | Box 83 \ 4 scan0039 | |
| Diagram illustrating a strengthening plate fitted to the near side front end of a rear spring. | 4th Nov 1935 | Box 83 \ 4 scan0040 | |
| Blueprint of a swiveling bracket and frame bracket assembly with notes on modifications or faults. | 5th Nov 1935 | Box 83 \ 4 scan0041 | |
| Letter to G.W. Hancock regarding testing and issues with a Bentley car, including tyres and valve seats. | 5th Nov 1935 | Box 83 \ 4 scan0042 | |
| 10,000-mile test report, particularly regarding con-rods and bearings, and a decision on introducing a larger bore. | 5th Nov 1935 | Box 83 \ 4 scan0043 | |
| Several vehicle faults from a 10,000-mile report, including leaks, flimsy parts, and concerns about bumper bar safety on Bentley models. | 5th Nov 1935 | Box 83 \ 4 scan0044 | |
| Confirming the decision to introduce the big bore Bentley following positive 10,000-mile test results, with attached coachwork reports. | 6th Nov 1935 | Box 83 \ 4 scan0045 | |
| Coachwork reports for two Bentley cars after extensive mileage in France. | 6th Nov 1935 | Box 83 \ 4 scan0046 | |
| Continued report detailing faults with a car body, including rattles, poor manufacturing, and wind noise. | 6th Nov 1935 | Box 83 \ 4 scan0047 | |
| B. 56. BN. Bentley regarding a broken connecting rod bearing and engine knock. | 6th Nov 1935 | Box 83 \ 4 scan0048 | |
| To G.W. Hancock regarding issues with rear spring anchorage and tyres. | 6th Nov 1935 | Box 83 \ 4 scan0049 | |
| Solutions for an oil leak from the rear engine bearing and a gearbox oil seal on a Bentley. | 7th Nov 1935 | Box 83 \ 4 scan0050 | |
| Technical memorandum discussing issues with front axle controls and the front bumper bar design. | 7th Nov 1935 | Box 83 \ 4 scan0051 | |
| Report discussing feedback on engine side trays, front guards, and bumper mountings from a 10,000-mile test. | 7th Nov 1935 | Box 83 \ 4 scan0052 | |
| Telex regarding the collection and forwarding of connecting rod bearings for Hancock. | 7th Nov 1935 | Box 83 \ 4 scan0053 | |
| Telegram from Chateauroux requesting clarification on which car is being referred to. | 7th Nov 1935 | Box 83 \ 4 scan0054 | |
| Brief typed note regarding a location in France and a preference for a Bentley car. | 8th Nov 1935 | Box 83 \ 4 scan0055 | |
| Failure of a rear road spring front anchorage bracket on a Bentley chassis. | 8th Nov 1935 | Box 83 \ 4 scan0056 | |
| Telegram reporting that Bentley bearings are too brittle and breaking up. | 8th Nov 1935 | Box 83 \ 4 scan0057 | |
| Acknowledging a telegram and confirming transport arrangements for connecting rod bearings to Chateauroux. | 8th Feb 1935 | Box 83 \ 4 scan0058 | |
| Performance and future of all-steel bodies versus aluminium-panelled bodies, including concerns about rust. | 8th Nov 1935 | Box 83 \ 4 scan0059 | |
| Analysis of bearing failures in Phantom III and B.56.BN Bentley vehicles. | 9th Nov 1938 | Box 83 \ 4 scan0060 | |
| Failure of crankshaft bearings on a B.56.BN Bentley and a delay caused by work on a Phantom. | 9th Nov 1935 | Box 83 \ 4 scan0061 | |
| Technical memo discussing oil leak issues at the rear engine bearing and gearbox, evaluating various proposed fixes. | 11th Nov 1935 | Box 83 \ 4 scan0062 | |
| Issues with a leaking retaining bush, front axle controls, and failing engine side trays on test cars. | 11th Nov 1933 | Box 83 \ 4 scan0063 | |
| Telegram to Hancock in France regarding the return and replacement of Spectre engine bearings. | 11th Nov 1935 | Box 83 \ 4 scan0064 | |
| Telegram requesting two bottom valve spring taps and asbestos packings for a Bentley engine. | 11th Nov 1935 | Box 83 \ 4 scan0065 | |
| Comparing the performance of steel bodies on their experimental cars with American cars, highlighting issues of noise, maintenance, door fit, and rust. | 14th Nov 1935 | Box 83 \ 4 scan0066 | |
| Accumulated experience with steel bodies on American cars, including rust and ventilation systems. | 14th Nov 1935 | Box 83 \ 4 scan0067 | |
| Discovered cracks in the pistons of a B. 56. BN. Bentley and subsequent repair actions. | 15th Nov 1935 | Box 83 \ 4 scan0068 | |
| Repair of a B. 56. BN. BENTLEY crankcase and bearings in France. | 14th Nov 1935 | Box 83 \ 4 scan0069 | |
| Telegram reporting that a chalk test on Bentley pistons revealed cracks, requesting six replacement pistons be sent to Paris. | 15th Nov 1938 | Box 83 \ 4 scan0070 | |
| Proposal to omit the propeller shaft damper on production cars, sent to G.W. Hancock. | 18th Nov 1935 | Box 83 \ 4 scan0071 | |
| Photograph showing damaged engine 'unfair' sheets after a 9,000-mile test run. | 18th Nov 1935 | Box 83 \ 4 scan0072 | |
| Photograph showing broken engine undersheets after 9,000 miles of use. | 18th Nov 1935 | Box 83 \ 4 scan0073 | |
| Progress of bedding in Bentley bearings by hand in Paris. | 19th Nov 1935 | Box 83 \ 4 scan0074 | |
| Receipt of a crankcase and crank for a B. 56. BN. Bentley, and enclosing requested photographs of Phantom III bearings. | 22th Nov 1935 | Box 83 \ 4 scan0075 | |
| Status of clutch springs and transmission rattle on a B. 56. BN. Bentley. | 23th Nov 1935 | Box 83 \ 4 scan0076 | |
| Bentley B. 56. BN engine completion, its initial running-in, and a clutch slipping issue due to oil contamination. | 24th Nov 1935 | Box 83 \ 4 scan0077 | |
| The despatch of a standard Bentley radiator with a special matrix to France. | 25th Nov 1935 | Box 83 \ 4 scan0078 | |
| Letter regarding the testing of a Bentley radiator with a 52 m.m. Marston Mark VI matrix. | 25th Nov 1935 | Box 83 \ 4 scan0079 | |
| The cure for a change speed lever and knob rattle on a B.56.BN Bentley. | 26th Nov 1935 | Box 83 \ 4 scan0080 | |
| Blueprint detailing a modification to the change speed lever using rubber components to prevent rattling. | 27th Nov 1935 | Box 83 \ 4 scan0081 | |
| Update on the status of car B-56-BN in France. | 27th Nov 1935 | Box 83 \ 4 scan0082 | |
| Short memo confirming that car B-56-BN is back on the road in France. | 29th Nov 1935 | Box 83 \ 4 scan0083 | |
| Letter to G.W. Hancock discussing vehicle reports, his return to Derby, and issues with an exhaust system and snout fouling. | 29th Nov 1935 | Box 83 \ 4 scan0084 | |
| Clutch tests for a B.56.BN Bentley at the Montlhéry Track and clarifying the propeller shaft is a standard part. | 1st Dec 1935 | Box 83 \ 4 scan0085 | |
| Parts received from Franco Brittanic Autos Ltd. for testing in France on chassis B-56-BN. | 2nd Dec 1935 | Box 83 \ 4 scan0086 | |
| Engine performance with 'commercial petrol' and a proposed new standard compression ratio. | 1st Dec 1935 | Box 83 \ 4 scan0087 | |
| Performance tests of a Bentley against various competitor cars including a Ford, Bugatti, and Lincoln. | 4th Dec 1935 | Box 83 \ 4 scan0088 | |
| Road test report comparing a Bentley's performance against a Ford, another Bentley, and a Bugatti. | 4th Dec 1935 | Box 83 \ 4 scan0089 | |
| Comparative vehicle performance tests against competitors. | 4th Dec 1935 | Box 83 \ 4 scan0090 | |
| Performance comparison tests of a Bentley against a Ford, another Bentley, a Bugatti, a Lincoln, and a Delage in Paris. | 4th Dec 1935 | Box 83 \ 4 scan0091 | |
| All-steel bodied Bentley, an order for 50 saloons, and a required inspection trip to France. | 4th Dec 1935 | Box 83 \ 4 scan0092 | |
| Arrangements for a test drive of an All Steel Bodied Bentley currently in France. | 5th Dec 1935 | Box 83 \ 4 scan0093 | |
| Cancelling a request for a custom rubber mounting for a Bentley petrol pump and instructing to fit a standard part. | 5th Dec 1935 | Box 83 \ 4 scan0094 | |
| Clarifying the term 'Commercial Petrol' and discussing a cylinder head change for engine B-56-BN. | 6th Dec 1935 | Box 83 \ 4 scan0095 | |
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