| Description | Date | Identifier | |
| Analysing tests on high power heads and considering an aluminium cylinder block engine. | 3rd Oct 1936 | Box 161a \ 4 scan0144 | |
| Cover note for a report detailing the progress of design work. | 30th Oct 1936 | Box 161a \ 4 scan0145 | |
| Status report listing engineering tasks and their completion status for Bentley III and 25/30 HP chassis. | 26th Oct 1936 | Box 161a \ 4 scan0146 | |
| Progress report on component modifications for the 25/30 HP and Phantom III chassis. | 28th Sep 1936 | Box 161a \ 4 scan0147 | |
| List of modifications and their completion status for the Phantom III model. | 26th Oct 1936 | Box 161a \ 4 scan0148 | |
| List of design position updates for the Phantom III model, detailing modifications and their status. | 27th Oct 1936 | Box 161a \ 4 scan0149 | |
| Design position report detailing the status of components for the Phantom III and Wraith II Chassis. | 28th Oct 1936 | Box 161a \ 4 scan0150 | |
| Design position report listing the status of various items for the Wraith II chassis. | 22th Oct 1936 | Box 161a \ 4 scan0151 | |
| Design position report for the Wraith II model, detailing axle and steering components. | 8th Oct 1936 | Box 161a \ 4 scan0152 | |
| Progress report on single cylinder and general research items, listing their design position status. | 24th Oct 1936 | Box 161a \ 4 scan0153 | |
| Design position report detailing progress on single cylinder research and Kestrel engine components. | 28th Oct 1936 | Box 161a \ 4 scan0154 | |
| Design position report detailing the status of modifications for Kestrel and Merlin F/1 engines. | 29th Oct 1936 | Box 161a \ 4 scan0155 | |
| List of design modifications and their completion status for the Merlin F/1 engine. | 29th Oct 1936 | Box 161a \ 4 scan0156 | |
| Design position report detailing modifications and their completion status for Merlin F/1 and Merlin 'O' engines. | 29th Oct 1936 | Box 161a \ 4 scan0157 | |
| Design position report detailing modifications and their completion status for the Merlin 'G' engine. | 20th Oct 1936 | Box 161a \ 4 scan0158 | |
| Design position report detailing modifications and development status for Merlin and Kestrel engines. | 24th Oct 1936 | Box 161a \ 4 scan0159 | |
| Design position report for the Vulture engine, listing various components and their completion status. | 17th Nov 1936 | Box 161a \ 4 scan0160 | |
| Design work and modifications for the Phantom III chassis. | 17th Nov 1936 | Box 161a \ 4 scan0161 | |
| The development of electrical petrol pumps and other miscellaneous items for future development. | 2nd Nov 1936 | Box 161a \ 4 scan0162 | |
| List of design position updates and their completion dates for the Phantom III chassis. | 2nd Nov 1936 | Box 161a \ 4 scan0163 | |
| List of design modifications and their corresponding completion status or date. | 16th Nov 1936 | Box 161a \ 4 scan0164 | |
| List of design items and their current status, noted as 'In hand'. | 19th Nov 1936 | Box 161a \ 4 scan0165 | |
| Research and development for the Phantom III chassis, discussing cylinder heads, valves, passages, and cooling systems. | 19th Nov 1936 | Box 161a \ 4 scan0166 | |
| Experiments and design considerations for vehicle components, including the Phantom III valve gear. | 19th Nov 1936 | Box 161a \ 4 scan0167 | |
| Status update on the development and testing of various Phantom III engine components. | 19th Nov 1936 | Box 161a \ 4 scan0168 | |
| Meeting minutes on cost reduction and future development for the Phantom III, 25/30 HP, and Wraith engines. | 13th Nov 1936 | Box 161a \ 4 scan0169 | |
| Meeting minutes discussing the 8-cylinder Wraith engine, connecting rod materials, and Bentley brake and testing developments. | 13th Nov 1936 | Box 161a \ 4 scan0170 | |
| Design work progress report on the Phantom III chassis, including updates on the clutch, exhaust, valve gear, and cost reductions. | 14th Dec 1936 | Box 161a \ 4 scan0171 | |
| Status report on design modifications and improvements for the Phantom III chassis. | 4th Dec 1936 | Box 161a \ 4 scan0172 | |
| Design position report for the Phantom III model, listing various modifications and their status. | 4th Dec 1936 | Box 161a \ 4 scan0173 | |
| List of design work completed and in hand for the Phantom III chassis. | 15th Jan 1937 | Box 161a \ 4 scan0174 | |
| Design position status report for items relating to the Phantom III chassis. | 24th Dec 1936 | Box 161a \ 4 scan0175 | |
| Progress report listing engineering modifications and their design completion status. | 14th Jan 1937 | Box 161a \ 4 scan0176 | |
| Summary of design work and modifications completed and in hand for the Phantom III chassis. | 17th Feb 1937 | Box 161a \ 4 scan0177 | |
| Design position report for various items related to the Phantom III chassis. | 8th Feb 1937 | Box 161a \ 4 scan0178 | |
| List of design modifications and their status, with some items completed and others in hand. | 11th Feb 1937 | Box 161a \ 4 scan0179 | |
| Design work completed and in hand for the 25/30 HP and Wraith II chassis. | 6th Jan 1937 | Box 161a \ 4 scan0180 | |
| Design status report for the 25/30 HP and Wraith II chassis. | 30th Dec 1936 | Box 161a \ 4 scan0181 | |
| List of design modifications and their completion status for the Wraith II chassis. | 6th Feb 1937 | Box 161a \ 4 scan0182 | |
| Status update on design work for the Wraith II and 25/30 HP chassis, including a revised engine scheme. | 6th Feb 1937 | Box 161a \ 4 scan0183 | |
| Design position status report for the Wraith II chassis components. | 2nd Feb 1937 | Box 161a \ 4 scan0184 | |
| List of design modifications and their completion status for the Wraith II model. | 5th Feb 1937 | Box 161a \ 4 scan0185 | |
| Status report listing design modifications, cost reduction efforts, and their completion status. | 5th Feb 1937 | Box 161a \ 4 scan0186 | |
| Design work on the Bentley Chassis, specifically frame welding modifications and work being prioritised on the Wraith. | 23th Feb 1937 | Box 161a \ 4 scan0187 | |
| Design position report for Bentley III and 4 1/4 Litre Bentley chassis components. | 6th Feb 1937 | Box 161a \ 4 scan0188 | |
| List of design position updates for items on the 4 1/4 Litre Bentley Chassis. | 4th Feb 1937 | Box 161a \ 4 scan0189 | |
| Design progress report on the Wraith Chassis and its components. | 9th Mar 1937 | Box 161a \ 4 scan0190 | |
| Design position report listing modifications and their status for the Wraith Chassis. | 10th Mar 1937 | Box 161a \ 4 scan0191 | |
| Status update on design modifications and their completion dates for the Wraith Chassis. | 8th Mar 1937 | Box 161a \ 4 scan0192 | |
| List of completed modifications and component changes for the Wraith Chassis. | 4th Mar 1937 | Box 161a \ 4 scan0193 | |
| Design progress report for the Raith Chassis, listing modifications and their completion status. | 4th Mar 1937 | Box 161a \ 4 scan0194 | |
| List of continued design items and their status for the Wraith Chassis. | 17th Mar 1937 | Box 161a \ 4 scan0195 | |
| Design work completed and in progress for the Phantom III Chassis. | 17th Mar 1937 | Box 161a \ 4 scan0196 | |
| Status report on modifications for the Phantom III chassis. | 16th Mar 1937 | Box 161a \ 4 scan0197 | |
| Design work completed on the Bentley chassis and the concentration of effort on the Wraith III. | 25th Mar 1937 | Box 161a \ 4 scan0198 | |
| Progress report on modifications and arrangements for the Bentley TTT and 4¼ Litre Chassis. | 23th Mar 1937 | Box 161a \ 4 scan0199 | |
| Design work progress report on the Wraith chassis, detailing updates on the engine, suspension, jacks, floorboards, and radiator. | 13th Apr 1937 | Box 161a \ 4 scan0200 | |
| Design instructions for frame modifications, including lightening holes and bolting crossmembers. | 10th Apr 1937 | Box 161a \ 4 scan0201 | |
| Design position report detailing modifications and updates for the Wraith chassis. | 10th Apr 1937 | Box 161a \ 4 scan0202 | |
| Status report of design modifications and tasks for the Wraith chassis, sheet 2. | 12th Apr 1937 | Box 161a \ 4 scan0203 | |
| Design position report for the Wraith chassis, detailing progress on the revised front suspension and gearbox. | 31th Mar 1937 | Box 161a \ 4 scan0204 | |
| Design position sheet detailing modifications and updates to the Wraith Chassis components. | 13th Apr 1937 | Box 161a \ 4 scan0205 | |
| Design position list for the Wraith Chassis detailing the status of various suspension and body components. | 12th Apr 1937 | Box 161a \ 4 scan0206 | |
| Design work status for the Phantom III Chassis. | 19th Apr 1937 | Box 161a \ 4 scan0207 | |
| Status report on design modifications and their completion status for the Phantom III chassis. | 27th Apr 1937 | Box 161a \ 4 scan0208 | |
| Cover note for a list of design work completed and in progress for the Bentley Chassis. | 27th Apr 1937 | Box 161a \ 4 scan0209 | |
| Design position report for the Bentley III chassis, listing various components and their development status. | 16th Apr 1937 | Box 161a \ 4 scan0210 | |
| Design position report for the 4¼ Litre Bentley Chassis. | 24th Apr 1937 | Box 161a \ 4 scan0211 | |
| Design work report on the Wraith Chassis, covering the engine, jacks, and frame modifications. | 22th May 1937 | Box 161a \ 4 scan0212 | |
| Design position and completion status for modifications on the Wraith III model. | 20th May 1937 | Box 161a \ 4 scan0213 | |
| List of design modifications, their reference numbers, and completion status. | 20th May 1937 | Box 161a \ 4 scan0214 | |
| List of design modifications with their reference numbers, status, and completion dates. | 21th May 1937 | Box 161a \ 4 scan0215 | |
| List of design work completed and in hand for the Phantom III chassis. | 2nd Jun 1937 | Box 161a \ 4 scan0216 | |
| List of design modifications and their completion status for the Phantom III chassis. | 2nd Jun 1937 | Box 161a \ 4 scan0217 | |
| Design position list detailing modifications and their completion status for various vehicle components. | 2nd Jun 1937 | Box 161a \ 4 scan0218 | |
| Design work for the Bentley Chassis, detailing the cancellation of Bentley III plans and a revised specification. | 3rd Jun 1937 | Box 161a \ 4 scan0219 | |
| Design position report detailing the status of various components for the Bentley TTT chassis. | 28th May 1936 | Box 161a \ 4 scan0220 | |
| Design status report listing modifications and their progress for the 4¼ Litre Bentley chassis. | 28th Sep 1937 | Box 161a \ 4 scan0221 | |
| List of S.U. petrol pumps removed from Bentley chassis during March 1938, detailing reasons for rejection. | 4th Apr 1938 | Box 162 \ 1 img001 | |
| Blueprint detailing a depot modification to prevent the oiling-up of a commutator for a 4 1/2 litre dynamo. | 30th Apr 1938 | Box 162 \ 1 img002 | |
| Blueprint for a depot modification to prevent oiling-up of a 4 1/4 Litre Dynamo commutator. | 30th Apr 1938 | Box 162 \ 1 img003 | |
| Drawing showing a modification to a 4 1/4 Litre Dynamo commutator to prevent oiling-up. | 30th Apr 1938 | Box 162 \ 1 img004 | |
| List of petrol pumps removed from Bentley chassis during August 1939, detailing mileage and rejection reasons. | 2nd Sep 1939 | Box 162 \ 1 img005 | |
| Investigation report into the cause of a fire behind an instrument board, which was traced to a faulty automatic cigar lighter. | 30th Aug 1939 | Box 162 \ 1 img006 | |
| List of S.U. petrol pumps removed from Bentley chassis during July 1939, detailing mileage and reasons for rejection. | 4th Aug 1939 | Box 162 \ 1 img007 | |
| Summary of petrol pump complaints for 3 1/2 & 4 1/4 litre Bentley models recorded during July 1939. | 4th Aug 1939 | Box 162 \ 1 img008 | |
| Causes of thermometer failures, identifying both driver error and mechanical issues during maintenance. | 14th Jul 1939 | Box 162 \ 1 img009 | |
| The merits of Lanoline versus Vaseline for preventing battery terminal corrosion. | 6th Jul 1939 | Box 162 \ 1 img010 | |
| Summary of petrol pump complaints for 3 1/2 & 4 1/4 litre Bentley models recorded during June 1939. | 10th Jul 1939 | Box 162 \ 1 img011 | |
| List of S.U. petrol pumps removed from Bentley chassis during June 1939, detailing failures and owner complaints. | 10th Jul 1939 | Box 162 \ 1 img012 | |
| Complete list of S.U. petrol pumps removed from Bentley chassis during June 1939, detailing reasons for rejection. | 10th Jul 1939 | Box 162 \ 1 img013 | |
| List of S.U. petrol pumps removed from Bentley chassis during June 1939, detailing reasons for rejection. | 10th Jul 1939 | Box 162 \ 1 img014 | |
| Repeated failures of a Bentley headlamp foot switch for a specific owner. | 29th Jun 1939 | Box 162 \ 1 img015 | |
| Notice stating that petrol pump repairs will now be conducted in-house at the Works, not by the S.U. Company. | 26th Jun 1939 | Box 162 \ 1 img016 | |
| Customer's report on battery cable corrosion and the potentially misleading information provided by a third-party repairer. | 23th Jun 1939 | Box 162 \ 1 img017 | |
| Summary of petrol pump complaints for 3.5 and 4.25 litre Bentley models recorded in May 1939. | 7th Jun 1939 | Box 162 \ 1 img018 | |
| List of S.U. petrol pumps removed from Bentley chassis during May 1939, detailing complaints and reasons for rejection. | 7th Jun 1939 | Box 162 \ 1 img019 | |
| Peeling of enamel from Lucas headlamps and the testing of non-enamelled alternatives. | 5th Jun 1939 | Box 162 \ 1 img020 | |
| Flaking enamel on the back of the latest Lucas headlamp reflectors. | 24th May 1939 | Box 162 \ 1 img021 | |
| Petrol pump complaints for 3½ & 4¼ litre Bentley models, recorded during April 1939. | 5th May 1939 | Box 162 \ 1 img022 | |
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