| Description | Date | Identifier | |
| Hand-drawn cross-sectional diagram of a mechanical joint assembly. | 19th Aug 1938 | Box 131 \ 2 scan0246 | |
| Diagram illustrating the oil feed system and connections for the Phantom III cross steering tubes. | 25th Aug 1938 | Box 131 \ 2 scan0247 | |
| Complaints and proposed solutions for the Phantom III model. | 25th Aug 1938 | Box 131 \ 2 scan0248 | |
| Various vehicle faults and the status of their resolution. | 25th Aug 1938 | Box 131 \ 2 scan0249 | |
| Modifications to the road wheels, nuts, and discs for a Bentley 50. | 25th Aug 1938 | Box 131 \ 2 scan0250 | |
| Specification note concerning cylinder iron production and chilled bores for chassis. | 27th Aug 1938 | Box 131 \ 2 scan0251 | |
| List of common complaints and proposed solutions for the 25/30 HP model. | 29th Aug 1938 | Box 131 \ 2 scan0252 | |
| Modifications to the exhaust system of car 26.G.VI to cure a whistling noise. | 16th Sep 1938 | Box 131 \ 2 scan0253 | |
| Resolving a metallic knock in a Wraith's rear shock damper by reducing lateral play. | 20th Sep 1938 | Box 131 \ 2 scan0254 | |
| The modification of an exhaust system silencer by welding up various rows of holes. | 20th Sep 1938 | Box 131 \ 2 scan0255 | |
| Bolt removed from a front suspension wishbone due to roller bearing failure and lubrication issues. | 20th Sep 1938 | Box 131 \ 2 scan0256 | |
| Mileage information for various cars after re-setting the spring load on side steering tubes. | 20th Sep 1938 | Box 131 \ 2 scan0257 | |
| The investigation and testing of thin oils, specifically Arctic oil, in Bentley cars. | 21th Sep 1938 | Box 131 \ 2 scan0258 | |
| Cylinder wear on chassis B.103.GP and suggesting a trial of 'Arctic' oil. | 22th Sep 1938 | Box 131 \ 2 scan0259 | |
| Bentley owner agreeing to test thin Arctic oil in a new 4 1/4 litre vehicle. | 22th Sep 1938 | Box 131 \ 2 scan0260 | |
| For a proposed service conference regarding free of charge work and known issues on the Phantom III. | 3rd Oct 1938 | Box 131 \ 2 scan0261 | |
| Summary of complaints and proposed fixes for 25/30 HP and Bentley chassis models, likely for a Service Conference. | 3rd Oct 1938 | Box 131 \ 2 scan0262 | |
| Bar chart tracking complaints for the Bentley 4 1/4 litre engine from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0263 | |
| Blueprint chart tracking customer complaints for Bentley cars from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0264 | |
| Bar chart of complaints for the 4 1/4 Litre Bentley from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0265 | |
| Chart of complaints for the 4¼ litre Bentley, detailing issues and fixes across the latter half of 1938. | 1st Jan 1938 | Box 131 \ 2 scan0266 | |
| Bar chart tracking vehicle complaints for the Bentley 4¼ Litre model during 1938. | 1st Jan 1938 | Box 131 \ 2 scan0267 | |
| Chart tracking customer complaints for the 4 1/4 Bentley model from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0268 | |
| Bar chart tracking monthly complaints for the 4¼ Bentley model from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0269 | |
| Query comparing cylinder bore wear figures between the 4¼ litre and 3½ litre Bentley engines. | 10th Oct 1938 | Box 131 \ 2 scan0270 | |
| List of customer complaints and depot criticisms for the Phantom III model. | 10th Oct 1938 | Box 131 \ 2 scan0271 | |
| List of technical faults and criticisms for 25/30 HP and Bentley models. | 10th Oct 1938 | Box 131 \ 2 scan0272 | |
| Modification to the Phantom III cross steering tube joints to reduce potential oil loss. | 14th Oct 1938 | Box 131 \ 2 scan0273 | |
| Bar chart tracking engine complaints for the 4 1/4 Bentley model during 1938. | 14th Oct 1938 | Box 131 \ 2 scan0274 | |
| Chart tracking engine failures for 3.5 and 4.25 litre Bentley models. | 14th Oct 1938 | Box 131 \ 2 scan0275 | |
| Chart detailing engine complaints for the 4¼ Litre Bentley model, showing data from July to October 1938. | 1st Jan 1938 | Box 131 \ 2 scan0276 | |
| Chart of complaints for the 4¼ litre Bentley, detailing issues and their frequency from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0277 | |
| Chart tracking complaints for a 4 1/4 Bentley model from July to December 1938. | 1st Jan 1938 | Box 131 \ 2 scan0278 | |
| Bar chart documenting vehicle system faults and modifications over the months of July to December 1938. | 1st Dec 1938 | Box 131 \ 2 scan0279 | |
| Chart tracking customer complaints for the 4 1/4 Bentley model from July to December 1938. | 1st Dec 1938 | Box 131 \ 2 scan0280 | |
| Bar chart documenting customer complaints for the 4¼ Bentley model for the second half of 1938. | 19th Oct 1938 | Box 131 \ 2 scan0281 | |
| Incurable customer complaints, particularly gear rattles and slipper wheel sticking on the 25/30 model. | 19th Oct 1938 | Box 131 \ 2 scan0282 | |
| Discussion of customer complaints and service criticisms regarding the Phantom III chassis. | 10th Oct 1938 | Box 131 \ 2 scan0283 | |
| Reliability issues and design updates for various car components including clocks, engine suspension, crankcases, and gears. | 10th Oct 1938 | Box 131 \ 2 scan0284 | |
| Issues with exhaust suspension, oil filters, general suspension, and tyre wear. | 10th Oct 1938 | Box 131 \ 2 scan0285 | |
| Issues and proposed improvements for steering, suspension, and wiring components. | 10th Oct 1938 | Box 131 \ 2 scan0286 | |
| Issues and considerations for various engine components. | 10th Oct 1938 | Box 131 \ 2 scan0287 | |
| Known issues and recommended fixes for the 25/30 HP chassis. | 10th Oct 1938 | Box 131 \ 2 scan0288 | |
| Technical report on Bentley vehicle issues including axle bearings, brakes, silencer rattle, and engine bearings. | 10th Oct 1938 | Box 131 \ 2 scan0289 | |
| Notes on oil flow test rigs for 4¼ litre engines and rattles in steering column controls. | 25th Oct 1938 | Box 131 \ 2 scan0290 | |
| Comparing cylinder bore wear figures for 3.5 and 4.25 litre Bentley engines. | 25th Oct 1938 | Box 131 \ 2 scan0291 | |
| Table of average engine bore wear measurements for 3.5 and 4.25 litre chassis over the years 1935 to 1938. | 25th Oct 1938 | Box 131 \ 2 scan0292 | |
| Diagram showing cylinder bore wear measurements and analysis at different mileages. | 25th Oct 1938 | Box 131 \ 2 scan0293 | |
| Broken piston head and engine damage on Lord Milton's Phantom III car, chassis 3.AZ.234. | 2nd Nov 1938 | Box 131 \ 3 scan0001 | |
| Bar chart of complaints for the Bentley 4¼ Litre engine, covering various issues from July to December 1938. | 27th Oct 1938 | Box 131 \ 3 scan0002 | |
| Chart detailing engine failures for 3 1/2 and 4 1/4 litre Bentley models from June 1937 to October 1938. | 27th Oct 1938 | Box 131 \ 3 scan0003 | |
| Bar chart of complaints for the Bentley 4¼ model during the latter half of 1938. | 31th Dec 1938 | Box 131 \ 3 scan0004 | |
| Bar chart tracking customer complaints for the 4¼ litre Bentley model from July to December 1938. | 31th Dec 1938 | Box 131 \ 3 scan0005 | |
| Chart detailing complaints for the Bentley 4 1/4 Litre model, specifically regarding clutch and brake issues, from July to December 1938. | 31th Dec 1938 | Box 131 \ 3 scan0006 | |
| Bar chart tracking vehicle component troubles and modifications from July to December 1938. | 31th Dec 1938 | Box 131 \ 3 scan0007 | |
| Chart tracking customer complaints by category for the 4 1/4 Bentley model from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0008 | |
| Bar chart tracking customer complaints for the 4¼ Bentley model from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0009 | |
| Investigation into the cause and remedy of recurrent servo squeaks on chassis GNC-26. | 21th Nov 1938 | Box 131 \ 3 scan0010 | |
| The prevalence of four-wheel hydraulic jacks fitted to Bentley cars. | 2nd Dec 1938 | Box 131 \ 3 scan0011 | |
| Responding to an inquiry about hydraulic jacks and overdrive Bentleys, based on a recent car census at the Depot. | 14th Dec 1938 | Box 131 \ 3 scan0012 | |
| Chart of engine complaints for the Bentley 4 1/4 Litre model from July to December 1938. | 14th Dec 1938 | Box 131 \ 3 scan0013 | |
| Chart tracking engine failures for 3 1/2 and 4 1/4 Litre Bentley models. | 14th Dec 1938 | Box 131 \ 3 scan0014 | |
| Bar chart tracking the number of complaints for various issues on the 4¼ litre Bentley from July to December 1938. | 14th Dec 1938 | Box 131 \ 3 scan0015 | |
| Bar chart tracking Bentley 4¼ vehicle complaints from July to December 1938. | 14th Dec 1938 | Box 131 \ 3 scan0016 | |
| Chart of complaints and subsequent maintenance actions for a 4 1/4 Bentley, from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0017 | |
| Blueprint bar chart tracking reported vehicle faults by month for the second half of 1938. | 1st Jan 1938 | Box 131 \ 3 scan0018 | |
| Chart tracking complaints for the 4¼-litre Bentley model by month for the latter half of 1938. | 1st Jan 1938 | Box 131 \ 3 scan0019 | |
| Bar chart tracking customer complaints for the Bentley 4¼ litre model during the latter half of 1938. | 14th Dec 1938 | Box 131 \ 3 scan0020 | |
| Noisy vibrations from the change speed lever on a Wraith Chassis WXA-36. | 14th Dec 1938 | Box 131 \ 3 scan0021 | |
| Report comparing customer complaints and costs for December 1937 and 1938 across Phantom III, 25/30 HP, and Bentley models. | 12th Jan 1939 | Box 131 \ 3 scan0022 | |
| Bar chart tracking Bentley engine complaints and modifications across various categories from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0023 | |
| Chart of engine failures for 3.5 and 4.25 litre Bentley models from June 1937 to the end of 1938. | 1st Jan 1938 | Box 131 \ 3 scan0024 | |
| Bar chart tracking complaints for 4¼ Litre Bentley vehicles from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0025 | |
| Chart of Bentley vehicle complaints tracking frequency by fault type from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0026 | |
| Chart of complaints for a 4¼ Bentley, detailing clutch and brake issues from July to December 1938. | 1st Jan 1938 | Box 131 \ 3 scan0027 | |
| Bar chart analysing vehicle faults by category on a monthly basis for the latter half of 1938. | 23th Nov 1938 | Box 131 \ 3 scan0028 | |
| Chart of complaints for the 4 1/4 Litre Bentley for the second half of 1938. | 1st Jan 1938 | Box 131 \ 3 scan0029 | |
| Chart tracking customer complaints for the 4¼ litre Bentley model during the latter half of 1938. | 12th Jan 1939 | Box 131 \ 3 scan0030 | |
| Relationship between the reduction in 'Free of Charge' work and the considerable decrease in car production output. | 12th Jan 1939 | Box 131 \ 3 scan0031 | |
| Bentley steering control rattles and a modification to increase clearance. | 19th Jan 1939 | Box 131 \ 3 scan0032 | |
| Despatch of four special nickel-chrome-molybdenum cylinder blocks for testing on customer cars to assess wear. | 23th Jan 1939 | Box 131 \ 3 scan0033 | |
| Requesting average bore wear figures for the Bentley close clearance piston EB.3151. | 23th Jan 1939 | Box 131 \ 3 scan0034 | |
| Investigation into Bentley steering control rattles. | 26th Jan 1939 | Box 131 \ 3 scan0035 | |
| Establishing a new section to centralise and manage service complaints, outlining its functions. | 1st Feb 1939 | Box 131 \ 3 scan0036 | |
| Final test report for car B.21.KU after fitting two new connecting rods. | 21th Feb 1939 | Box 131 \ 3 scan0037 | |
| Depot complaints regarding ignition, horn, and valve issues on Wraith and Phantom III models. | 21th Feb 1939 | Box 131 \ 3 scan0038 | |
| Faults with new headlamps and damage to carburettor main jets on Phantom III & 25/30 HP models. | 21th Feb 1939 | Box 131 \ 3 scan0039 | |
| The test results for two Wraith calorstats. | 28th Feb 1939 | Box 131 \ 3 scan0040 | |
| Carburetter throttle synchronisation for slow running adjustment on the 4 1/4 Litre Bentley. | 4th Mar 1939 | Box 131 \ 3 scan0041 | |
| Cover note for charts detailing 4¼ Litre Bentley complaints up to the end of February. | 14th Mar 1939 | Box 131 \ 3 scan0042 | |
| Chart tracking complaints for the 4 1/4 Bentley model for the first half of 1939. | 1st Jan 1939 | Box 131 \ 3 scan0043 | |
| Blank chart for tracking engine failures on 3 1/2 and 4 1/4 Bentley models for the year 1939. | 1st Jan 1939 | Box 131 \ 3 scan0044 | |
| Bar chart tracking various engine faults, their causes, and frequency from January to June 1939. | 1st Jan 1939 | Box 131 \ 3 scan0045 | |
| Chart tracking rear axle and silencer complaints and failures by month for 1939. | 1st Jan 1939 | Box 131 \ 3 scan0046 | |
| Bar chart tracking clutch and brake complaints and their remedies over the first six months of 1939. | 30th Jun 1939 | Box 131 \ 3 scan0047 | |
| Bar chart analysing vehicle faults for the first half of 1939. | 30th Jun 1939 | Box 131 \ 3 scan0048 | |
| Fault analysis chart for various vehicle components for the first half of 1939. | 18th Mar 1939 | Box 131 \ 3 scan0049 | |
| Complaint about Mr. Staniland's car fitted with a high compression cylinder head. | 18th Mar 1939 | Box 131 \ 3 scan0050 | |
| Arranging the measurement of cylinder wear on American cars, with a closing question about Hitler's impact on a program. | 27th Mar 1939 | Box 131 \ 3 scan0051 | |
| Typed memo regarding the measurement of American cars. | 27th Mar 1939 | Box 131 \ 3 scan0052 | |
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