| Description | Date | Identifier | |
| Programme of test bed work for the B.III No.1 unit, detailing valve head modifications and power comparisons. | 14th Jun 1938 | Box 155 \ 2 scan0228 | |
| Test schedule and special feature modifications for Wraith III and B.III engine units. | 14th Jun 1938 | Box 155 \ 2 scan0229 | |
| Test procedures for B.III NO.5 and W.III NO.9 units, including endurance and oscillation tests. | 14th Jun 1938 | Box 155 \ 2 scan0230 | |
| Test procedures for various engine units, including crank oscillation, detonation, and compression ratio checks. | 14th Jun 1938 | Box 155 \ 2 scan0231 | |
| Internal request to order 2 dozen Tecalemit filters for use on experimental chassis unit beds. | 29th Jun 1938 | Box 155 \ 2 scan0232 | |
| Requesting completion dates for various engine development jobs. | 12th Jul 1938 | Box 155 \ 2 scan0233 | |
| Programme for test bed work detailing engine component testing procedures. | 14th Jul 1938 | Box 155 \ 2 scan0234 | |
| Test and assembly procedures for Wraith III No.4 and B.III No.5 units. | 14th Jul 1938 | Box 155 \ 2 scan0235 | |
| Engine testing procedures and the dispatch of aerolite pistons and L-section rings. | 14th Jul 1938 | Box 155 \ 2 scan0236 | |
| Status report on the position and tests being carried out on Wraith and Bentley III units. | 3rd Jun 1938 | Box 155 \ 2 scan0237 | |
| Specification sheet detailing modifications for three Wraith III engine units. | 3rd Jun 1938 | Box 155 \ 2 scan0238 | |
| Specification sheet for Wraith III engine units No.3, No.4, and No.5. | 3rd Jun 1938 | Box 155 \ 2 scan0239 | |
| Summary of specifications and modifications for Wraith III units No. 5, 6, 7, and 8. | 3rd Jun 1938 | Box 155 \ 2 scan0240 | |
| Specification notes for Wraith and B.III development units. | 3rd Jun 1938 | Box 155 \ 2 scan0241 | |
| Specification sheet detailing modifications for B.III No.2 and No.3 units. | 3rd Jun 1938 | Box 155 \ 2 scan0242 | |
| Lack of a suitable rear mounting for standard gearboxes on Wraith or Bentley III models in the test house. | 9th Aug 1938 | Box 155 \ 2 scan0243 | |
| Programme of test bed works for comparing various camshafts and other engine components. | 10th Sep 1938 | Box 155 \ 2 scan0244 | |
| List of test procedures and modifications for engine units W.III NO.4 and W.III NO.9. | 10th Sep 1938 | Box 155 \ 2 scan0245 | |
| Engine test procedures and progress notes for B.III No. 5, B.III No. 9, and B.60 units. | 10th Sep 1938 | Box 155 \ 2 scan0246 | |
| Test procedures for engine units W.III No.1 and B.II No.4, detailing bore wear tests, coupling modifications, and piston comparisons. | 10th Sep 1938 | Box 155 \ 2 scan0247 | |
| Comparison of single cylinder heads for power and detonation. | 10th Sep 1938 | Box 155 \ 2 scan0248 | |
| Requesting an overhaul of a dynamo removed from Wraith No.4 after it failed endurance testing. | 12th Sep 1938 | Box 155 \ 2 scan0249 | |
| Requesting the return of a 'Jaeger' rev counter for overhaul. | 22th Sep 1938 | Box 155 \ 2 scan0250 | |
| Programme of test bed work for Wraith III and B.III engine components, including damper comparisons and cylinder head tests. | 25th Oct 1938 | Box 155 \ 2 scan0251 | |
| Test procedures and investigations for combustion chamber heads and the B.60 No.1 Unit. | 25th Oct 1938 | Box 155 \ 2 scan0252 | |
| Test procedures for Wraith III and Bentley II engine units, focusing on bore wear, piston, and ring comparisons. | 25th Oct 1938 | Box 155 \ 2 scan0253 | |
| Proposal to send four blocks for fitment to customer cars that exhibit excessive bore wear. | 25th Oct 1938 | Box 155 \ 2 scan0254 | |
| Requesting the return of a stopwatch, engraved 'experimental car unit test', to the makers for repair. | 28th Oct 1938 | Box 155 \ 2 scan0255 | |
| Status report on tests being carried out on Bentley III, Bentley 60 and Bentley II engine units. | 11th Nov 1938 | Box 155 \ 2 scan0256 | |
| List of components and specifications for Bentley III engine units No.3 and No.4. | 11th Nov 1938 | Box 155 \ 2 scan0257 | |
| Specification list for various engine components and configurations. | 11th Nov 1938 | Box 155 \ 2 scan0258 | |
| List of specifications and modifications for the B.60 Unit No.1 test bed development engine. | 11th Nov 1938 | Box 155 \ 2 scan0259 | |
| Specifications and modifications for engine units B.60 No.2, B.III No.4, and B.II No.15. | 11th Nov 1938 | Box 155 \ 2 scan0260 | |
| Specifications for Bentley engine units II No.19, II No.20, and B.23 OHC. | 11th Nov 1938 | Box 155 \ 2 scan0261 | |
| List of specifications for the Bentley III No.24 Unit 6.B.IV engine. | 11th Nov 1938 | Box 155 \ 2 scan0262 | |
| Programme of test bed work for the Bentley III No.1 engine, detailing a series of performance and component tests. | 15th Nov 1938 | Box 155 \ 2 scan0263 | |
| Engine testing procedures and specifications for Wraith III No.4 and B.III No.7 units. | 15th Nov 1938 | Box 155 \ 2 scan0264 | |
| Continuation of engine unit test procedures for B.III No. 7 and the procedures for B.60 No. 2 Unit. | 15th Nov 1938 | Box 155 \ 2 scan0265 | |
| Test procedures and modifications for engine units B.60 No.2, B.60 No.1, and Wraith III No.1. | 15th Nov 1938 | Box 155 \ 2 scan0266 | |
| Instructions for testing an OHC engine with sodium-filled valves in comparison with a B.60 engine. | 15th Nov 1938 | Box 155 \ 2 scan0267 | |
| Status report on the configuration of Wraith III test units No.1 and No.2. | 18th Nov 1938 | Box 155 \ 2 scan0268 | |
| Status report on various Wraith III units, detailing their components and modifications. | 18th Nov 1938 | Box 155 \ 2 scan0269 | |
| List of specifications for various Wraith engine units, numbers 7, 8, 9, and a Wraith II unit. | 18th Nov 1938 | Box 155 \ 2 scan0270 | |
| List of components and modifications for Phantom III engine units No. 8, 12, and 14. | 18th Nov 1938 | Box 155 \ 2 scan0271 | |
| Specification sheet for engine unit number 16 (35-EX.). | 18th Nov 1938 | Box 155 \ 2 scan0272 | |
| Suggestions for future tests on a new chassis, covering gearbox, clutch, and rear axle, before going into production. | 22th Nov 1938 | Box 155 \ 2 scan0273 | |
| Testing procedures for propellor shaft and suspension systems, including rig and road tests. | 22th Nov 1938 | Box 155 \ 2 scan0274 | |
| Rig, road, and endurance testing procedures for vehicle components. | 22th Nov 1938 | Box 155 \ 2 scan0275 | |
| Schedule of endurance and performance tests for steering and engine components. | 22th Nov 1938 | Box 155 \ 2 scan0276 | |
| Endurance testing standards for cooling system components, bonnets, heaters, and demisters. | 22th Nov 1938 | Box 155 \ 2 scan0277 | |
| Testing procedures for the cooling system, including dynamometer, road, and endurance tests. | 22th Nov 1938 | Box 155 \ 2 scan0278 | |
| Summary of suggested future testing procedures covering coachwork, winter running, and a strategy for mileage-based development. | 24th Nov 1938 | Box 155 \ 2 scan0279 | |
| Programme of test bed work for B.III engine units No. 1 and No. 6. | 24th Nov 1938 | Box 155 \ 2 scan0280 | |
| Test and modification schedule for engine units B.III NO.6, Wraith III NO.4, and B.60 NO.2. | 24th Nov 1938 | Box 155 \ 2 scan0281 | |
| Test procedures and parameters for B.60 engine units, including endurance and clearance checks. | 24th Nov 1938 | Box 155 \ 2 scan0282 | |
| Continued instructions for testing the B.60 No.1 Unit and the Wraith III No.1. | 24th Nov 1938 | Box 155 \ 2 scan0283 | |
| Programme of test bed work for the B.80 No.1 unit. | 11th Jan 1939 | Box 155 \ 2 scan0284 | |
| Testing and modification instructions for B.V. NO.5 and B.V. NO.1 engine units. | 11th Jan 1939 | Box 155 \ 2 scan0285 | |
| Test procedures for a Wraith III unit with vibration issues and a B.60 unit with modified pistons. | 11th Jan 1939 | Box 155 \ 2 scan0286 | |
| Test instructions for B.60, Wraith III, and B.II engine units, focusing on piston trials, rattle investigation, and power checks. | 11th Jan 1939 | Box 155 \ 2 scan0287 | |
| Completing test bed experiments on a Duplex Stromberg Carburetter for the No.1 engine. | 13th Jan 1939 | Box 155 \ 2 scan0288 | |
| Requesting the measurement of blow-by into the crankcase during endurance tests. | 16th Jan 1939 | Box 155 \ 2 scan0289 | |
| Requesting the removal of two engines and components from a test house to Shardlow for storage. | 2nd Feb 1939 | Box 155 \ 2 scan0290 | |
| Programme of test bed work for the B.80 No.1 and Bentley V No.1 engine units. | 6th Feb 1939 | Box 155 \ 2 scan0291 | |
| List of engine testing and development tasks for various units. | 6th Feb 1939 | Box 155 \ 2 scan0292 | |
| List of tests to be conducted on an engine unit, including checks for power, exhaust, compression, and oil consumption. | 6th Feb 1939 | Box 155 \ 2 scan0293 | |
| Request to return two Jaeger rev counters for repair. | 10th Feb 1939 | Box 155 \ 2 scan0294 | |
| Requesting an order for 6 Tecalemit filter elements for the chassis test beds. | 14th Feb 1939 | Box 155 \ 2 scan0295 | |
| Programme of test bed work for B 80, B V, and Wraith III engine units. | 15th Feb 1939 | Box 155 \ 2 scan0296 | |
| Instructions for modifications and testing of various engine units. | 15th Feb 1939 | Box 155 \ 2 scan0297 | |
| Test procedures and modifications for engine units N 11 No 4 and Bentley 11 S No 19. | 9th Aug 1938 | Box 155 \ 2 scan0298 | |
| Outlining a series of comparative tests for engine components, particularly focusing on cylinder bore wear. | 9th Aug 1938 | Box 155 \ 2 scan0299 | |
| Programme of test bed works for the B.80 No2 Unit. | 6th Mar 1939 | Box 155 \ 2 scan0300 | |
| Engine testing procedures including crankshaft oscillation, power curves, and oil consumption for B.80 units. | 6th Mar 1939 | Box 155 \ 2 scan0301 | |
| Engine test program detailing work on B.V. and Wraith III units, covering camshafts, crankshafts, and pistons. | 6th Feb 1939 | Box 155 \ 2 scan0302 | |
| Test instructions for various B-series and Bentley S engine units. | 6th Feb 1939 | Box 155 \ 2 scan0303 | |
| Proposing a standardized method for recording data on power curves from engine tests. | 24th Mar 1939 | Box 155 \ 2 scan0304 | |
| The programme of work for test beds, including instructions for various units. | 27th Mar 1939 | Box 155 \ 2 scan0305 | |
| Urgent test requirements for the Wraith III No.4 and B.V. No.6 engine units. | 27th Mar 1939 | Box 155 \ 2 scan0306 | |
| Engine testing procedures for Bentley II No.4 and B.60 No.3 units, detailing oil consumption, blow-by, and power curve checks. | 27th Mar 1939 | Box 155 \ 2 scan0307 | |
| Test procedures and special features for a B.60 No.4 Unit undergoing a 15,000-mile test. | 27th Mar 1939 | Box 155 \ 2 scan0308 | |
| Tune-up instructions for B.60 No. 4 Unit, covering leaks, carbs, idling, gears, and valve gear. | 27th Mar 1939 | Box 155 \ 2 scan0309 | |
| From one department to another listing engines and parts for which a completion date is requested. | 18th Apr 1939 | Box 155 \ 2 scan0310 | |
| List of components for a 4-cylinder long-distance forging, part number PD.405. | 18th Apr 1939 | Box 155 \ 2 scan0311 | |
| Programme of test bed work for the B.80 and Wraith III units, focusing on detonation, distribution, and piston comparisons. | 27th Apr 1939 | Box 155 \ 2 scan0312 | |
| Test procedures and conditions for Wraith III and B-series engine units in the No. 5 Test House. | 27th Apr 1939 | Box 155 \ 2 scan0313 | |
| Engine component testing procedures for various units. | 27th Apr 1939 | Box 155 \ 2 scan0314 | |
| Requesting the return of two Jaeger rev counters for overhaul. | 4th May 1939 | Box 155 \ 2 scan0315 | |
| Programme of test bed work for various engine units including endurance and oil consumption tests. | 8th May 1939 | Box 155 \ 2 scan0316 | |
| Test procedures and checks for W.III No.9 and B.60 No.1 engine units. | 8th May 1939 | Box 155 \ 2 scan0317 | |
| Instructions for modifications and testing procedures for B.60 and B.80 engine units. | 8th May 1939 | Box 155 \ 2 scan0318 | |
| Request to return a Negretti & Zambra thermometer to the makers for repair. | 9th May 1939 | Box 155 \ 2 scan0319 | |
| Programme of test bed work for the Wraith Ripple No.2 Unit engine. | 16th May 1939 | Box 155 \ 2 scan0320 | |
| Testing and assembly specifications for Wraith Ripple No.2 and Wraith III No.4 engine units. | 16th May 1939 | Box 155 \ 2 scan0321 | |
| Test programme for engine units B.60, B.80, and B.II, covering cylinder heads, dampers, and oil consumption. | 16th May 1939 | Box 155 \ 2 scan0322 | |
| Programme of test bed work for the B.80 No.4 Unit, including special features and test conditions. | 25th May 1939 | Box 155 \ 2 scan0323 | |
| Specifications and test procedures for Wraith III engine units No. 10 and No. 4. | 25th May 1939 | Box 155 \ 2 scan0324 | |
| Work program for testing and modifying various engine units. | 25th May 1939 | Box 155 \ 2 scan0325 | |
| Comparison of oil consumption and 'blow by' on Hepworth and Grandage rings. | 25th May 1939 | Box 155 \ 2 scan0326 | |
| Programme of test bed work for the B.80 No. 5 unit, detailing special features and subsequent tests. | 15th Jun 1939 | Box 155 \ 2 scan0327 | |
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