| Description | Date | Identifier | |
| Querying the engine bore dimensions for the Phantom III, Bentley 3.5 litre, and 20/25 models. | 3rd Sep 1936 | Box 101 \ 3 scan0032 | |
| Confirming the cylinder bore dimension for the 20/25 model, comparing it to the small bore Bentley and the Phantom III. | 4th Sep 1936 | Box 101 \ 3 scan0033 | |
| Serious customer complaints regarding the Phantom III's steering, gearbox, and clutch. | 28th Sep 1936 | Box 101 \ 3 scan0034 | |
| Minor troubles and development updates for various car components. | 28th Sep 1936 | Box 101 \ 3 scan0035 | |
| Vehicle testing issues including radiator appearance, carburetion, petrol lock, tyre noise, and silent tappets. | 28th Sep 1936 | Box 101 \ 3 scan0036 | |
| Progress report on the 25/30 HP model covering tests in France, steering, oil consumption, clutch, and improved idling. | 28th Sep 1936 | Box 101 \ 3 scan0037 | |
| Various tests and issues for Bentley vehicles, including a 15,000-mile test in France. | 28th Sep 1936 | Box 101 \ 3 scan0038 | |
| Progress report on developments including the exhaust system, ride, body, engine, and rear axle. | 28th Sep 1936 | Box 101 \ 3 scan0039 | |
| Design and installation of an earthing contact for the front hubs on Bentley, 25/30, and Phantom III cars to improve wireless performance. | 29th Sep 1936 | Box 101 \ 3 scan0040 | |
| Scheme for improved engine breathing on the 25/30 HP engine, requiring new parts for an experiment. | 30th Sep 1936 | Box 101 \ 3 scan0041 | |
| Confirming the decision not to proceed with previously requested experiments. | 9th Oct 1936 | Box 101 \ 3 scan0042 | |
| Summary of car work jobs currently instructed for various vehicle models. | 19th Oct 1936 | Box 101 \ 3 scan0043 | |
| List of engineering notes on various vehicle components such as brakes, clutch, steering, and cylinders. | 19th Oct 1936 | Box 101 \ 3 scan0044 | |
| List of modifications and parts for Bentley, 25/30 HP, and Phantom III units. | 19th Oct 1936 | Box 101 \ 3 scan0045 | |
| List of engine parts and modifications with corresponding reference numbers and dates. | 19th Oct 1936 | Box 101 \ 3 scan0046 | |
| List for the numbering of 25/30-HP chassis units. | 15th Oct 1936 | Box 101 \ 3 scan0047 | |
| Progress report on the 15,000-mile car (35-EX), covering tests and solutions for steering, clutch, hydraulic tappets, and oiling issues. | 7th Dec 1936 | Box 101 \ 3 scan0048 | |
| Technical update on the development and testing of valve springs, exhaust systems, bearings, tyre noise reduction, and brakes. | 7th Dec 1936 | Box 101 \ 3 scan0049 | |
| Status update on the Phantom III chassis, engine, gearbox, costs, and the 25/30 HP model. | 7th Dec 1936 | Box 101 \ 3 scan0050 | |
| Progress report on component endurance testing, design modifications, and production status for the 25/30 HP, Bentley, and Wraith models. | 7th Dec 1936 | Box 101 \ 3 scan0051 | |
| Technical update on Bentley development, covering brakes, suspension, clutch, body, engine, and bearings. | 7th Dec 1936 | Box 101 \ 3 scan0052 | |
| Improvements and tests for engine mountings, gearbox costs, aluminium alloys, spark plugs, and light alloy drums. | 7th Dec 1936 | Box 101 \ 3 scan0053 | |
| Table detailing the weights of various 1937 Buick parts across different series. | 24th Mar 1937 | Box 101 \ 3 scan0054 | |
| Upcoming visit to Cricklewood to investigate slow running complaints on a 25/30 model. | 1st May 1937 | Box 101 \ 3 scan0055 | |
| Comparison table of specific capacities for Bent., 25/30, and Ph.III car engines. | 3rd May 1937 | Box 101 \ 3 scan0056 | |
| Testing of a short duration camshaft on the Wraith and comparing its performance to American cars. | 10th May 1937 | Box 101 \ 3 scan0057 | |
| Investigation into poor slow running (idling) on the 30 HP model. | 6th May 1937 | Box 101 \ 3 scan0058 | |
| Engine development including governors, ignition systems, camshaft modifications, and performance issues. | 6th May 1937 | Box 101 \ 3 scan0059 | |
| Experimental modifications to the 25/30 ignition governor to improve slow running and reduce detonation. | 13th May 1937 | Box 101 \ 3 scan0060 | |
| Engine governor characteristics, timing adjustments, and proposals for standardizing components. | 13th May 1937 | Box 101 \ 3 scan0061 | |
| Comparative table of technical specifications for various automobile engines. | 19th May 1937 | Box 101 \ 3 scan0062 | |
| Weight comparison between a 'Square engine' and a 'Phoenix' engine. | 19th May 1937 | Box 101 \ 3 scan0063 | |
| Poor slow running on a 25/30 HP chassis, specifically the Air Minister's car. | 10th May 1937 | Box 101 \ 3 scan0064 | |
| Tests of a special ignition governor and new coil to address poor slow running on the 25/30HP engine. | 28th May 1937 | Box 101 \ 3 scan0065 | |
| Slow running, performance, and acceleration test results for a GAE-20 30 HP vehicle. | 1st Jun 1937 | Box 101 \ 3 scan0066 | |
| Engine tests to improve slow running by adjusting tappet clearances and testing various ignition coils. | 1st May 1937 | Box 101 \ 3 scan0067 | |
| List of three engineering modifications concerning hand control, coil, and camshaft. | 1st Jun 1937 | Box 101 \ 3 scan0068 | |
| Instructions to improve slow running (idling) on the 25/30 model. | 5th Jun 1937 | Box 101 \ 3 scan0069 | |
| The investigation into slow running and idling issues with Lord Swinton's car. | 5th Jun 1937 | Box 101 \ 3 scan0070 | |
| Investigation into slow running and poor idling issues, detailing modifications and test results. | 5th Jun 1937 | Box 101 \ 3 scan0071 | |
| Carburettor characteristics and planned modifications for a car identified as 'Sheriff'. | 5th Jun 1937 | Box 101 \ 3 scan0072 | |
| Instructions for modifying the 25/30 governor to improve slow running with the deturbulated cylinder head. | 7th Jun 1937 | Box 101 \ 3 scan0073 | |
| Table of engine RPM versus crank degrees advance. | 7th Jun 1937 | Box 101 \ 3 scan0074 | |
| Dispatch memo regarding the transport of a 25/30 oil filler and cap to St. Pancras for use at Kingsbury. | 8th Jun 1937 | Box 101 \ 3 scan0075 | |
| Phone message detailing the arrival of a 30 HP Filler at St. Pancras station. | 8th Jun 1937 | Box 101 \ 3 scan0076 | |
| Instruction to modify depot sheet instructions for slow running, specifically concerning tappet settings. | 8th Jun 1937 | Box 101 \ 3 scan0077 | |
| Rectifying slow running and idling issues on Lord Swinton's 30.HP car. | 8th Jun 1937 | Box 101 \ 3 scan0078 | |
| Findings for improving slow running, with recommendations on tappet clearances, ignition timing, and spark plugs, plus other issues. | 8th Jun 1937 | Box 101 \ 3 scan0079 | |
| Technical memorandum detailing ignition timing adjustments for the 25/30 HP engine at slow speeds. | 10th Jun 1937 | Box 101 \ 3 scan0080 | |
| Page 2 of a document discussing a control unit designed to replace an existing vacuum unit for running with a partly opened throttle. | 10th Jun 1937 | Box 101 \ 3 scan0081 | |
| 25/30 HP chassis output programme from the erecting bay to the test department for June to December 1937. | 10th Jun 1937 | Box 101 \ 3 scan0082 | |
| The issue of spitting in the silencer for the 30 HPD.C.42. | 14th Jun 1937 | Box 101 \ 3 scan0083 | |
| Modification to fix poor slow running on the 25/30 model, requesting information on the cost before a general rollout. | 18th Jun 1937 | Box 101 \ 3 scan0084 | |
| Cost and distribution of a modification for a 'slow running' issue on the 25/30 HP chassis. | 19th Jun 1937 | Box 101 \ 3 scan0085 | |
| The slow running of a 25/30 model, requesting coils for a modification. | 3rd Jul 1937 | Box 101 \ 3 scan0086 | |
| The supply of non-standardised coils for a 25/30 HP model with a slow running issue. | 5th Jul 1937 | Box 101 \ 3 scan0087 | |
| Proposed programme for 100 chassis of the 25/30 HP S.2 Series, numbers 7913 to 8012. | 7th Jul 1937 | Box 101 \ 3 scan0088 | |
| Production schedule for the 25/30 HP Chassis S.2 Series, numbers 7913-8012. | 28th Jun 1937 | Box 101 \ 3 scan0089 | |
| Works chart detailing the weekly chassis output programme for the 25/30 HP model from July to December 1937. | 15th Jul 1937 | Box 101 \ 3 scan0090 | |
| Standardisation of parts for an Ignition Governor E.60879 and modified spring to improve idling on a 25/30 HP model. | 14th Jun 1937 | Box 101 \ 3 scan0091 | |
| Nil extra tool cost and production start for the P2 series chassis. | 15th Sep 1937 | Box 101 \ 3 scan0092 | |
| Works chart detailing the weekly output programme for the 25/30 HP chassis from the erecting bay to the test department for late 1937. | 15th Sep 1937 | Box 101 \ 3 scan0093 | |
| Production report detailing weekly output figures and cumulative position on series for early 1938. | 15th Sep 1937 | Box 101 \ 3 scan0094 | |
| Alteration notice for the 25/30 HP Chassis inlet pipes, replacing part K.4316 with two K.4010 nuts. | 23th Sep 1937 | Box 101 \ 3 scan0095 | |
| Requesting mileage details for a recently sold experimental car. | 15th Dec 1937 | Box 101 \ 3 scan0096 | |
| Stating the mileage of vehicle GAE.20 since an engine change. | 20th Dec 1937 | Box 101 \ 3 scan0097 | |
| Progress report on thermoid clutch linings, a silencer spitting complaint, a new accelerator pump piston, and general economy. | 20th Apr 1938 | Box 101 \ 3 scan0098 | |
| Persistent quality issues with cast iron brake drums from supplier Messrs. Lake & Elliott, leading to a search for an alternative source. | 14th Mar 1935 | Box 101 \ 4 scan0001 | |
| Allocation of an ex-Trials car, G.A.E.20, for testing smaller wheels in France. | 15th Mar 1935 | Box 101 \ 4 scan0002 | |
| Noise test for a ventilated dynamo, identifying an electrical noise during charging while the fan remains quiet. | 15th Mar 1935 | Box 101 \ 4 scan0003 | |
| Use of chassis 21-G-IV instead of GAE-20 for a 10,000-mile test on a 20/25 model with smaller wheels. | 15th Mar 1935 | Box 101 \ 4 scan0004 | |
| 10,000-mile test on a 20/25 model with smaller wheels. | 18th Mar 1935 | Box 101 \ 4 scan0005 | |
| Confirming alterations to the front and rear springs on a 20/25 HP chassis with smaller wheels. | 18th Mar 1935 | Box 101 \ 4 scan0006 | |
| Fitting smaller wheels to a 20/25 model for a 10,000-mile test and a suggestion to increase the rear spring camber. | 19th Mar 1935 | Box 101 \ 4 scan0007 | |
| Smaller wheels for the 20/25 model, a 10,000-mile test, and rear spring adjustments. | 19th Mar 1935 | Box 101 \ 4 scan0008 | |
| Sourcing and suitability of cast iron brake drums for various chassis. | 19th Mar 1935 | Box 101 \ 4 scan0009 | |
| Steering lightness and a potential modification using a shorter pendulum lever on car GAE-20. | 21th Mar 1935 | Box 101 \ 4 scan0010 | |
| The readiness of a modified dynamo for a test on a 20/25 HP Chassis. | 25th Mar 1935 | Box 101 \ 4 scan0011 | |
| List of parts to be fitted to a 20/25 HP car for a 10,000-mile test. | 26th Mar 1935 | Box 101 \ 4 scan0012 | |
| Standardisation of chassis dynamos and clutch pits between the 20/25 HP and Bentley models. | 27th Mar 1935 | Box 101 \ 4 scan0013 | |
| New design for a 25-HP crankcase breather pipe, incorporated into the oil filler, to be fitted to a car for France. | 28th Mar 1935 | Box 101 \ 4 scan0014 | |
| Technical memo discussing the steering and suspension geometry implications of fitting 17-inch rims to a 20/25 HP chassis. | 28th Mar 1935 | Box 101 \ 4 scan0015 | |
| Modifications to the rear springs on a 20/25 HP model to restore ground clearance when fitted with 17' rims. | 3rd Apr 1935 | Box 101 \ 4 scan0016 | |
| Preparations for a 10,000-mile test on a 20/25 model with smaller wheels. | 5th Apr 1935 | Box 101 \ 4 scan0017 | |
| Typed letter from France reporting on car performance, specifically clutch and crankshaft damping issues, and upcoming track testing. | 6th Apr 1935 | Box 101 \ 4 scan0018 | |
| Modifications to the 20/25 connecting rod big end and the fitting of a Spectre steering column for a 10,000-mile test. | 8th Apr 1935 | Box 101 \ 4 scan0019 | |
| 15,000-mile test in France for the 21-G-IV vehicle to trial a new Spectre petrol pump, tap, and warning gauge. | 8th Apr 1935 | Box 101 \ 4 scan0020 | |
| Specification of modifications for the 15,000-mile test car 21-G-IV. | 8th Apr 1935 | Box 101 \ 4 scan0021 | |
| The fitting of a new petrol system for a 15,000 miles test on car 21-G-IV. | 9th Apr 1935 | Box 101 \ 4 scan0022 | |
| Letter from coachbuilders Hooper & Co. regarding a delay in handing over a car due to issues with body noises and temporary paint. | 16th Apr 1935 | Box 101 \ 4 scan0023 | |
| List of instructions for modifications and examinations for chassis 21-G-IV before its dispatch to France. | 16th Apr 1935 | Box 101 \ 4 scan0024 | |
| Requesting a modification to the petrol system's tank unit float for the 15,000 miles test. | 9th Apr 1935 | Box 101 \ 4 scan0025 | |
| Testing a new big end bearing and modifications to connecting rods for improved lubrication. | 18th Apr 1935 | Box 101 \ 4 scan0026 | |
| List of modifications and specifications for car 21-G-IV before its dispatch to France. | 24th Apr 1935 | Box 101 \ 4 scan0027 | |
| Requesting an alteration to the dashboard bracket to accommodate a fuel pump rubber mounting. | 25th Apr 1935 | Box 101 \ 4 scan0028 | |
| Specification of the Petrol System for model 21-G-IV. | 25th Apr 1935 | Box 101 \ 4 scan0029 | |
| Note on the delay of the 15,000-mile smaller wheels test for car 21-G-IV due to the fitting of a new hypoid rear axle. | 26th Apr 1935 | Box 101 \ 4 scan0030 | |
| Delaying the 15,000-mile smaller wheel test on car 21-G-IV to fit a new hypoid rear axle. | 26th Apr 1935 | Box 101 \ 4 scan0031 | |
| Summary of specifications for the 21-G-IV model being prepared for a 10,000 miles test. | 29th Apr 1935 | Box 101 \ 4 scan0032 | |
| Vehicle modifications including noise insulation, brake re-lining, and issues with fitting a new rear axle. | 29th Apr 1935 | Box 101 \ 4 scan0033 | |
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