| Description | Date | Identifier | |
| Modified headlamp bracket fixings for the 20/25 HP 'T' series. | 20th May 1931 | Box 104 \ 3 scan0139 | |
| Designing and testing deeper frames for the P.2. and Japan 4. models. | 4th Jul 1931 | Box 104 \ 3 scan0140 | |
| Potential model names from the deer tribe and the design and development progress for the J.3 and 18HP chassis. | 1st Aug 1931 | Box 104 \ 3 scan0141 | |
| Specifications for the frame, transmission, and springs for the J.3. project. | 7th Sep 1931 | Box 104 \ 3 scan0142 | |
| Sending scheme 3329, showing the front dumb iron, front cross member, and front portion of the starting handle tube. | 11th Sep 1931 | Box 104 \ 3 scan0143 | |
| Scheme 3342, which outlines slight modifications to a frame's rear end. | 12th Sep 1931 | Box 104 \ 3 scan0144 | |
| Scheme 3341, which shows a modification to the rear dumb iron, spring shackle, and frame side member. | 12th Sep 1931 | Box 104 \ 3 scan0145 | |
| Necessity of subframes due to a new engine mounting system. | 5th Nov 1931 | Box 104 \ 3 scan0146 | |
| Modifications to the rear dumb irons for bumper pads, replacing previously sent versions. | 10th Nov 1931 | Box 104 \ 3 scan0147 | |
| Inquiring about the company's experience with diamond mounting on car bodies not built on sub-frames. | 16th Nov 1931 | Box 104 \ 3 scan0148 | |
| Modification note to reduce the depth of the second crossmember for the Japan 3 rear end. | 26th Nov 1931 | Box 104 \ 3 scan0149 | |
| Request to experiment with forging thickened flanges on drawn tubes for car work cross members. | 30th Nov 1931 | Box 104 \ 3 scan0150 | |
| Design and specifications for the rear end of car model J.3. | 30th Nov 1931 | Box 104 \ 3 scan0151 | |
| Specifications for the front end of a J.3 chassis. | 16th Jan 1932 | Box 104 \ 3 scan0152 | |
| Tubular cross member with twisted flanges and requesting prints of a schematic. | 16th Jan 1932 | Box 104 \ 3 scan0153 | |
| Proposed design and manufacturing method for a J. 3. frame tubular cross member. | 1st Feb 1932 | Box 104 \ 3 scan0154 | |
| Production timeline and material alternatives for J.3. rear wheel arch castings. | 25th Feb 1932 | Box 104 \ 3 scan0155 | |
| Investigation and potential solutions for the 'frame jellying' complaint on certain car models. | 7th Mar 1932 | Box 104 \ 3 scan0156 | |
| Standardisation of a sheet metal cross member to lower the floor of the body. | 4th Jan 1932 | Box 104 \ 3 scan0157 | |
| First chassis to be fitted with a new part, including costs and test dates. | 12th Mar 1932 | Box 104 \ 3 scan0158 | |
| Torsional rigidity of the J.3 frame compared to the 25 HP car, and requesting a second frame for testing. | 29th Apr 1932 | Box 104 \ 3 scan0159 | |
| Comparing frame flexibility and 'jellying' on the J.III model versus the standard 25 HP. | 8th Jun 1932 | Box 104 \ 3 scan0160 | |
| Technical memo discussing engine damper settings to reduce frame jellying on various car models. | 8th Mar 1932 | Box 104 \ 3 scan0161 | |
| Measurement data for bonnet movement under chassis torsion for various car models. | 21th Jun 1932 | Box 104 \ 3 scan0162 | |
| Authorizing the order of two sets of 20/25 HP chassis frame side members for experimental testing and specifying the material. | 21th Jun 1932 | Box 104 \ 3 scan0163 | |
| Decision to delete the body subframe on the Phantom II chassis. | 18th Jul 1932 | Box 104 \ 3 scan0164 | |
| Note on subframes and a related standardisation sheet. | 18th Jul 1932 | Box 104 \ 3 scan0165 | |
| Confirmation regarding the 20/25 HP chassis cold pressed side members and the circulation of standardisation sheets. | 11th Apr 1933 | Box 104 \ 3 scan0166 | |
| List of ground clearances for various parts of a chassis, noting a damaged cross member on vehicle 1.J.III. | 25th Apr 1933 | Box 104 \ 3 scan0167 | |
| Standardisation of chassis parts, specifically cold pressed side members, to reduce cost. | 12th Apr 1933 | Box 104 \ 3 scan0168 | |
| The introduction of a new part for the A.2 chassis series, including test date and tooling costs. | 8th May 1933 | Box 104 \ 3 scan0169 | |
| The production method for Box Section Frame Side Members, piece number EX.13183. | 5th Feb 1934 | Box 104 \ 3 scan0170 | |
| Sample side channels, piece no. EX.13183, being cold-pressed and despatched by English Steel Corporation. | 14th Feb 1934 | Box 104 \ 3 scan0171 | |
| Requesting the introduction of stepirons lowered by 2 inches as a standard modification for the 25 HP & P.2 models. | 14th Mar 1934 | Box 104 \ 3 scan0172 | |
| Standardisation of a dropped front cross member to improve appearance. | 25th Jul 1934 | Box 104 \ 3 scan0173 | |
| Estimated cost for extra jigs, tools, and equipment for 'G.2' series production. | 3rd Sep 1934 | Box 104 \ 3 scan0174 | |
| Standardisation of a rear cross member moved for wells in the rear floorboards to improve accommodation. | 25th Jul 1934 | Box 104 \ 3 scan0175 | |
| Estimate for the cost of extra jigs, tools, and equipment for production of the 'G' series chassis. | 6th Sep 1934 | Box 104 \ 3 scan0176 | |
| Cost reduction proposal for the 20/25 HP chassis by removing frame tie rods. | 19th Dec 1935 | Box 104 \ 3 scan0177 | |
| The removal of 20/25 Frame Tie Rods from car 21-G-IV to reduce costs before its endurance mileage. | 23th Dec 1935 | Box 104 \ 3 scan0178 | |
| Instruction to re-introduce propeller shaft dampers for the 25/30 HP Transmission from the 151st chassis in the M2 series. | 29th Aug 1936 | Box 104 \ 3 scan0179 | |
| Internal memorandum regarding the condition of silencers for chassis B.115-HM. | 14th Jun 1939 | Box 104 \ 3 scan0180 | |
| Ongoing issues with rattles in the rear silencer and actions taken. | 24th Mar 1939 | Box 104 \ 3 scan0181 | |
| Fitting of longer exhaust studs KB.358. | 24th Mar 1939 | Box 104 \ 3 scan0182 | |
| Cause and repair of an exhaust leak on Chassis B.27.LE for Mr. Embiricos. | 9th Nov 1938 | Box 104 \ 3 scan0183 | |
| Chassis B.27.LE for Mr. Embiricos, discussing design issues, arrangement drawings, and material changes. | 17th Nov 1938 | Box 104 \ 3 scan0184 | |
| To Bentley Motors regarding the origin of perforated metal pieces found in a rear silencer. | 2nd Nov 1938 | Box 104 \ 3 scan0185 | |
| Technical memorandum discussing the cause of clip breakage on a Bentley Rear Silencer and potential repair methods. | 25th Oct 1938 | Box 104 \ 3 scan0186 | |
| Exhaust blow on a Bentley car due to a loose rivet and suggesting improved welding practices. | 20th Oct 1938 | Box 104 \ 3 scan0187 | |
| Failure of clips and rivets on a Bentley rear silencer, chassis B.35.KU. | 14th Oct 1938 | Box 104 \ 3 scan0188 | |
| Sketch illustrating a potential crack where a mounting bracket joins a circular pipe or component. | 7th Oct 1938 | Box 104 \ 3 scan0189 | |
| Procedure to repair a rattling Bentley rear silencer caused by poor welding. | 7th Oct 1938 | Box 104 \ 3 scan0190 | |
| Rear silencer welding issue on a Bentley chassis, specifically related to loose supporting clips. | 30th Sep 1938 | Box 104 \ 3 scan0191 | |
| Complaint about a rattle in the rear silencer for Bentley Chassis B-35-KO. | 27th Sep 1938 | Box 104 \ 3 scan0192 | |
| Customer complaints of loose baffles in Bentley rear silencers and the repair procedure. | 14th Jun 1938 | Box 104 \ 3 scan0193 | |
| Investigating the failure of a Bentley silencer baffle, concluding an explosion was the likely cause. | 17th Jun 1938 | Box 104 \ 3 scan0194 | |
| Investigation into rattles developing in Bentley rear silencers. | 9th Jun 1938 | Box 104 \ 3 scan0195 | |
| Loose baffle from a Bentley B.112.LS expansion chamber, attributed to insufficient riveting. | 10th Jun 1938 | Box 104 \ 3 scan0196 | |
| Rattle in Bentley rear silencers, identifying the cause as a faulty clip or loose rivets. | 30th May 1938 | Box 104 \ 3 scan0197 | |
| Complaint about a rattling exhaust system on a Bentley due to a failed lagging clip. | 11th Jan 1937 | Box 104 \ 3 scan0198 | |
| Modification to the expansion chambers on 3½-litre and 4¼-litre Bentley models to prevent a rattling clip. | 1st Dec 1936 | Box 104 \ 3 scan0199 | |
| Revised policy on the replacement and reasonable life of car silencers. | 31th Mar 1939 | Box 104 \ 3 scan0200 | |
| Modification to the exhaust system of car 26.G.VI to cure a whistle. | 16th Sep 1938 | Box 104 \ 3 scan0201 | |
| Inquiry regarding the fitment and performance of a rubber suspension made for a 25/30HP chassis silencer. | 14th Sep 1938 | Box 104 \ 3 scan0202 | |
| Fitting of a rubber suspension to Chassis GAN-54 for reliability tests. | 8th Sep 1938 | Box 104 \ 3 scan0203 | |
| 20 HP fan's potential for overheating and suggestions for improvement. | 17th Jul 1928 | Box 104 \ 3 scan0204 | |
| Request for the manufacture of three roller-chain sprockets and the supply of chain for an indicator drive. | 3rd Sep 1928 | Box 104 \ 3 scan0205 | |
| Requesting a set of fan blades for the 20 HP chassis to increase radiator cooling capacity. | 24th Apr 1929 | Box 104 \ 3 scan0206 | |
| Standardisation of a Goodrich endless canvas rubber fan belt for the chassis. | 11th Jul 1930 | Box 104 \ 3 scan0207 | |
| Standardisation of a Dunlop Rubber Fan Belt for the 25 HP Chassis. | 14th Jan 1931 | Box 104 \ 3 scan0208 | |
| Standardisation document for a chassis part, detailing fitting and cost information. | 28th Jan 1931 | Box 104 \ 3 scan0209 | |
| Position of a fan bracket for the 'Japan 3' project, referencing drawing Lec. 2889. | 14th Mar 1931 | Box 104 \ 3 scan0210 | |
| Reversing the hand of the fan bracket and requiring a new spindle forging. | 14th Mar 1932 | Box 104 \ 3 scan0211 | |
| Requesting the acquisition of competitor fans (Chrysler 6, Terraplane Eight) to troubleshoot issues on a 25 HP car. | 15th Jun 1933 | Box 104 \ 3 scan0212 | |
| Letter regarding obtaining fans from Chrysler and Terraplane cars, and the unsatisfactory performance of petrol pumps on specific models. | 16th Jun 1933 | Box 104 \ 3 scan0213 | |
| Confirming the dispatch of a Chrysler Fan for the 25 HP model to the Works Stores. | 4th Jul 1933 | Box 104 \ 3 scan0214 | |
| Confirming receipt of a Chrysler fan for 25 HP fan tests. | 5th Jul 1933 | Box 104 \ 3 scan0215 | |
| Modification to the 20/25 HP fan to reduce noise and requesting its standardization. | 13th Jul 1933 | Box 104 \ 3 scan0216 | |
| Standardisation of parts for a cooling fan to reduce noise. | 10th Nov 1933 | Box 104 \ 3 scan0217 | |
| Request to make two 25 HP fans for testing, alongside a comparison of Harrison Vee and Marston Mark III radiator matrices. | 1st Jan 1934 | Box 104 \ 3 scan0218 | |
| Request to manufacture a fan spacing distance piece for a 25HP model to reduce the fan's distance from the radiator. | 15th Jun 1934 | Box 104 \ 3 scan0219 | |
| Requesting the manufacture of an altered 20/25 HP asymmetrical fan. | 18th Jun 1934 | Box 104 \ 3 scan0220 | |
| Request to construct two 20/25HP fans with blades similar to the Phantom II, one with symmetrical and one with asymmetrical placement. | 20th Jun 1934 | Box 104 \ 3 scan0221 | |
| The measured deflection of a 20/25HP fan belt under load. | 3rd Aug 1934 | Box 104 \ 3 scan0222 | |
| Request for an experimental fan to be built with staggered blades for a 20/25 HP engine. | 3rd Oct 1934 | Box 104 \ 3 scan0223 | |
| Crack in a Bentley & 20/25 flexible blade fan and requesting a design modification. | 19th Mar 1936 | Box 104 \ 3 scan0224 | |
| Graph showing power loss comparison for different fan types against engine RPM. | 1st Mar 1936 | Box 104 \ 3 scan0225 | |
| Request to build a second 20/25 HP flexible blade fan to compare different steel blade thicknesses. | 3rd Apr 1936 | Box 104 \ 3 scan0226 | |
| Failure and proposed redesign of the 20/25 HP & Bentley flexible blade fans. | 15th May 1936 | Box 104 \ 3 scan0227 | |
| Replacing an incorrectly fitted Bentley fan with a standard 25 HP fan on car 21-G-IV. | 1st Jul 1936 | Box 104 \ 3 scan0228 | |
| Loose outer rivets on the 25/30 HP fan, suggesting a replacement with a larger Bentley-size rivet. | 24th Sep 1936 | Box 104 \ 3 scan0229 | |
| Rivet load issues on the 25/30 HP fan and proposing modifications. | 29th Sep 1936 | Box 104 \ 3 scan0230 | |
| Tests comparing different types of pressed fan blades for Bentley and 25/30 HP cars. | 4th May 1937 | Box 104 \ 3 scan0231 | |
| Summary proposing the adoption of a new, cheaper, and more reliable fan blade set for 25/30.HP and Bentley cars. | 4th May 1937 | Box 104 \ 3 scan0232 | |
| Comparison of different fan types tested on a Bentley car B.56.BN at Brooklands. | 4th May 1937 | Box 104 \ 3 scan0233 | |
| Comparison of different fan blades and their critical air temperature under idling conditions on a 22.C.V. car. | 23th Jan 1939 | Box 104 \ 3 scan0234 | |
| Potential issue with transfer holes on Bentley Chassis B.65.JT. | 23th Jan 1939 | Box 104 \ 3 scan0235 | |
| Selector trouble issue on a Bentley Chassis B.65.JY. | 20th Jan 1939 | Box 104 \ 3 scan0236 | |
| Potential issue with the selector rod housing on a Bentley B.65-JY car. | 14th Jan 1939 | Box 104 \ 3 scan0237 | |
| Technical drawing showing a section view of a mechanical component. | 20th Feb 1938 | Box 104 \ 3 scan0238 | |
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