| Description | Date | Identifier | |
| Testing reduced valve lift on the Phantom III engine to achieve quieter timing gears. | 19th Aug 1937 | Box 155 \ 2 scan0128 | |
| Status report on tests for experimental Bentley units, with specifications for the B-2 spare unit. | 30th Aug 1937 | Box 155 \ 2 scan0129 | |
| Specifications for engine components of models B-3 and B-4, including post-endurance examination results. | 30th Aug 1937 | Box 155 \ 2 scan0130 | |
| List of specifications and modifications for various engine builds. | 30th Aug 1937 | Box 155 \ 2 scan0131 | |
| Specification sheet listing engine and vehicle components and settings. | 30th Jun 1937 | Box 155 \ 2 scan0132 | |
| Specifications for two engine builds, B-18 for testing with Nelson Bohnalite pistons and B-19 for assembly. | 30th May 1937 | Box 155 \ 2 scan0133 | |
| List of engine component specifications and modifications. | 30th Jun 1937 | Box 155 \ 2 scan0134 | |
| Specification sheet detailing modifications for engine builds B-22, B-23, and B-24. | 30th Aug 1937 | Box 155 \ 2 scan0135 | |
| Programme of test bed work for a Wraith III engine and a Bentley Bed. | 3rd Sep 1937 | Box 155 \ 2 scan0136 | |
| Program of engine component tests including rockers, pistons, camshafts and valve systems. | 3rd Sep 1937 | Box 155 \ 2 scan0137 | |
| Testing requirements for engine clearances, tappet noise, and a trial twin exhaust manifold. | 3rd Sep 1937 | Box 155 \ 2 scan0138 | |
| List detailing the status and tests being carried out on Phantom III experimental units. | 6th Sep 1937 | Box 155 \ 2 scan0139 | |
| Development tests and assembly notes for engine units No. 3, 4, and 6. | 6th Sep 1937 | Box 155 \ 2 scan0140 | |
| Specification list for engine units numbered 6, 8, 9, and 10, detailing their components and status. | 6th Sep 1937 | Box 155 \ 2 scan0141 | |
| List of specifications for engine units number 10, 11, and 12. | 6th Sep 1937 | Box 155 \ 2 scan0142 | |
| List of modifications and specifications for engine units 13 (32-EX) and 14. | 6th Sep 1937 | Box 155 \ 2 scan0143 | |
| Specification sheet detailing the components and modifications for Units 14, 15, and 16. | 6th Sep 1937 | Box 155 \ 2 scan0144 | |
| Specification for the 250-hour endurance type test for the Wraith engine. | 14th Sep 1937 | Box 155 \ 2 scan0145 | |
| List of procedures and conditions for endurance testing of an engine unit, page 2. | 14th Sep 1937 | Box 155 \ 2 scan0146 | |
| Continued list of parameters to be recorded during testing, such as temperatures, pressures, and consumption. | 15th Sep 1937 | Box 155 \ 2 scan0147 | |
| Programme of test bed work for the Wraith III No. 2 unit, detailing tests to address oil leaks and evaluate induction and exhaust systems. | 15th Sep 1937 | Box 155 \ 2 scan0148 | |
| Instructions for endurance testing of various engine units and components. | 15th Sep 1937 | Box 155 \ 2 scan0149 | |
| Hold-up on No.2 Bed for modifications and subsequent continuation of tests. | 15th Sep 1937 | Box 155 \ 2 scan0150 | |
| Requesting the urgent conversion of No. 30 Test Bed from a Bentley to a Wraith III configuration. | 22th Sep 1937 | Box 155 \ 2 scan0151 | |
| Status report on tests for Wraith III, II, and 25/30 units, including test bed, chassis, and engine specifications. | 23th Sep 1937 | Box 155 \ 2 scan0152 | |
| List of engine and component specifications for various units, including spare parts. | 3rd Sep 1937 | Box 155 \ 2 scan0153 | |
| Specification sheet detailing components and modifications for Wraith II and Wraith III units. | 23th Sep 1937 | Box 155 \ 2 scan0154 | |
| Specification details for three different Wraith III engine units (No.2, No.3, and No.4). | 23th Sep 1937 | Box 155 \ 2 scan0155 | |
| List of specifications and modifications for the Wraith III, No. 5 Unit. | 23th Sep 1937 | Box 155 \ 2 scan0156 | |
| Programme of test bed work for the Wraith III No.6 Unit, detailing new features and test procedures. | 30th Sep 1937 | Box 155 \ 2 scan0157 | |
| Engine component testing instructions and modifications for various units. | 30th Sep 1937 | Box 155 \ 2 scan0158 | |
| Series of engine component testing procedures and instructions. | 30th Sep 1937 | Box 155 \ 2 scan0159 | |
| Request for data and special brackets to test a Phantom III unit with a Sommers indicator and dampers. | 30th Sep 1937 | Box 155 \ 2 scan0160 | |
| Programme of test bed work for Wraith III engines No. 6 and No. 2, detailing endurance runs and modification tests. | 8th Oct 1937 | Box 155 \ 2 scan0161 | |
| Engine and component testing procedures and endurance test updates. | 8th Oct 1937 | Box 155 \ 2 scan0162 | |
| Request to rewire the charging circuit for the Wraith No. 30 test house No.2 bed. | 7th Oct 1937 | Box 155 \ 2 scan0163 | |
| Request for a pane of glass to be installed in the window of No. 5 Test House. | 18th Oct 1937 | Box 155 \ 2 scan0164 | |
| Programme of test bed work for the Wraith III No. 6 engine, detailing tests for distribution, oil consumption, and the oil filter. | 17th Nov 1937 | Box 155 \ 2 scan0165 | |
| Test and observation schedule for the running-in of the Wraith III No. 7 Unit. | 17th Nov 1937 | Box 155 \ 2 scan0166 | |
| Test schedule for various engine units, including damper comparisons, clutch tests, and bearing endurance. | 17th Nov 1937 | Box 155 \ 2 scan0167 | |
| Test report on Buick type pistons and a trial of a Bentley 50 type cylinder head. | 17th Nov 1937 | Box 155 \ 2 scan0168 | |
| Revision of programmes for Experimental Chassis Test Beds No. 33 and No. 5. | 26th Nov 1937 | Box 155 \ 2 scan0169 | |
| Request to fit a 25/30 steering roller, produced by Hoffmanns, to the rig steering box. | 1st Dec 1937 | Box 155 \ 2 scan0170 | |
| Programme of test bed work for Wraith III engine units No. 6 and No. 8. | 10th Dec 1937 | Box 155 \ 2 scan0171 | |
| Test procedures and modifications for Wraith III and PH.III engine units. | 10th Nov 1937 | Box 155 \ 2 scan0172 | |
| Units available for oil consumption, piston, and cylinder bore wear tests. | 10th Dec 1937 | Box 155 \ 2 scan0173 | |
| List and specification sheet for experimental Bentley and Phantom III engine units. | 20th Dec 1937 | Box 155 \ 2 scan0174 | |
| List of specifications and tests for various engine components and builds. | 20th Dec 1937 | Box 155 \ 2 scan0175 | |
| List of engine component specifications, part numbers, and clearances. | 20th Dec 1937 | Box 155 \ 2 scan0176 | |
| List of specifications for various engine components, modifications, and test configurations. | 20th Dec 1937 | Box 155 \ 2 scan0177 | |
| List of specifications for engine components, including crankshafts, cylinder heads and pistons for Phantom III and Spare Test Units. | 20th Dec 1937 | Box 155 \ 2 scan0178 | |
| List of specifications for the assembly of Unit No.6 for endurance testing. | 20th Dec 1937 | Box 155 \ 2 scan0179 | |
| Specification sheet for the assembly and testing of engine units No. 12 and No. 13. | 20th Dec 1937 | Box 155 \ 2 scan0180 | |
| List of specifications and modifications for engine unit No. 14. | 20th Dec 1937 | Box 155 \ 2 scan0181 | |
| List of modifications and component specifications for various engine builds, including Unit No.16 (35-EX). | 20th Dec 1937 | Box 155 \ 2 scan0182 | |
| Notes on a Fabroil idler, cork oil level float, standard flywheel and clutch, and a filler cap. | 20th Dec 1937 | Box 155 \ 2 scan0183 | |
| General development position summary on Phantom III and Wraith experimental cars and ongoing tests. | 29th Dec 1937 | Box 155 \ 2 scan0184 | |
| Progress report on vehicle component testing and improvements for the Wraith and Bentley models. | 29th Dec 1937 | Box 155 \ 2 scan0185 | |
| Progress report on projects B.III and B.50, including chassis, engine testing, and gearbox development. | 29th Dec 1937 | Box 155 \ 2 scan0186 | |
| Programme of test bed work for Wraith III units, focusing on oil consumption and piston ring issues. | 3rd Jan 1938 | Box 155 \ 2 scan0187 | |
| Testing procedures and observations for Wraith III engine units No. 8 and No. 9. | 3rd Jan 1938 | Box 155 \ 2 scan0188 | |
| Progress report on endurance testing, component changes, and fuel comparison for various engine units. | 3rd Jan 1938 | Box 155 \ 2 scan0189 | |
| Test schedule for engine components including piston comparisons, bore wear, and exhaust system analysis. | 3rd Jan 1938 | Box 155 \ 2 scan0190 | |
| Continuation of a report on exhaust system tests, comparing 3-port and 4-port systems for head design B.111. | 3rd Jan 1938 | Box 155 \ 2 scan0191 | |
| Renovation of the No.5 Test House to fit the new B.50 engine on the Phantom III test bed. | 26th Jan 1938 | Box 155 \ 2 scan0192 | |
| Programme of test bed work for a B.III No.1 Unit, detailing power comparison and performance improvement tests. | 27th Jan 1938 | Box 155 \ 2 scan0193 | |
| Series of engine tests, modifications, and future test plans for various units. | 27th Jan 1938 | Box 155 \ 2 scan0194 | |
| Endurance test specifications and procedures for the Phantom III No.6 engine unit. | 27th Jan 1938 | Box 155 \ 2 scan0195 | |
| Engine endurance test schedule for exhaust system comparisons on a Phantom III unit. | 27th Jan 1938 | Box 155 \ 2 scan0196 | |
| Status report on the positions and tests being carried out on Wraith and Bentley III units. | 7th Feb 1938 | Box 155 \ 2 scan0197 | |
| List of specifications and modifications for various Wraith II and Wraith III engine units. | 7th Feb 1938 | Box 155 \ 2 scan0198 | |
| Specification and modification notes for Wraith III engine units No.2, No.3, No.4, and No.5. | 7th Feb 1938 | Box 155 \ 2 scan0199 | |
| Specification sheet for Wraith III units No. 5, 6, and 7. | 7th Feb 1938 | Box 155 \ 2 scan0200 | |
| Specifications and exceptions for various Wraith III and Bentley III engine units. | 7th Feb 1938 | Box 155 \ 2 scan0201 | |
| Programme of test bed work for B.III No.1 and Wraith III No.2 engine units. | 2nd Mar 1938 | Box 155 \ 2 scan0202 | |
| Test specifications for Wraith III and Wraith II engine units, detailing modifications and running procedures. | 2nd Mar 1938 | Box 155 \ 2 scan0203 | |
| Instructions for comparative bore wear tests on a Wraith III unit and exhaust system investigation on a No. 2 Bed unit. | 2nd Mar 1938 | Box 155 \ 2 scan0204 | |
| Results of test bed trials on engine suppressors and their durability. | 3rd Mar 1938 | Box 155 \ 2 scan0205 | |
| Test report on the effect of Dubilier suppressors on Bentley engine performance. | 7th Feb 1938 | Box 155 \ 2 scan0206 | |
| Programme of test bed work for B.III and Wraith III engine units. | 28th Mar 1938 | Box 155 \ 2 scan0207 | |
| Test procedures for a Bentley III engine unit and a single cylinder unit on test beds. | 28th Mar 1938 | Box 155 \ 2 scan0208 | |
| Instructions for exhaust system comparisons on an OHC Bentley and endurance testing for a B.4 unit. | 28th Mar 1938 | Box 155 \ 2 scan0209 | |
| Programme of test bed work for engine units B.III and Wraith III, focusing on valve bounce and torsional oscillation. | 27th Apr 1938 | Box 155 \ 2 scan0210 | |
| Test and modification notes for Wraith III engine units, including special parts. | 27th Apr 1938 | Box 155 \ 2 scan0211 | |
| Endurance testing procedures for a distributor and camwheel, with additional instructions for reports and a Bentley Bed unit. | 27th Apr 1938 | Box 155 \ 2 scan0212 | |
| Endurance testing procedures and special parts fitted for a B.4 unit and a single cylinder test. | 27th Apr 1938 | Box 155 \ 2 scan0213 | |
| Reports on Jaguar and Bentley exhaust systems, crankshaft oscillations, and engine timing adjustments. | 27th Apr 1938 | Box 155 \ 2 scan0214 | |
| Request to re-wire connections between the starter motor, switchboard, and dynamo in No. 30 Test House. | 4th May 1938 | Box 155 \ 2 scan0215 | |
| The purchase of six glass thermometers for chassis experimental test beds. | 17th May 1938 | Box 155 \ 2 scan0216 | |
| Programme of test bed work for a B.III No.1 Unit, detailing investigations into exhaust systems and cylinder head configurations. | 21th May 1938 | Box 155 \ 2 scan0217 | |
| Progress report on the testing and development of B.III and Wraith III engine units. | 21th May 1938 | Box 155 \ 2 scan0218 | |
| Test procedures and parts fitted for B.III No. 3 unit and Wraith III No. 7 unit. | 21th May 1938 | Box 155 \ 2 scan0219 | |
| Engine testing report detailing procedures for Wraith III, Oldsmobile, and single-cylinder units. | 21th May 1938 | Box 155 \ 2 scan0220 | |
| Instructions for re-assembling a B.III NO.4 unit to compare its standard head against an adapted B.III head. | 21th May 1938 | Box 155 \ 2 scan0221 | |
| Status report on the position and tests being carried out on Wraith and Bentley III units. | 3rd Jun 1938 | Box 155 \ 2 scan0222 | |
| Specification details for three different Wraith III engine units. | 3rd Jun 1938 | Box 155 \ 2 scan0223 | |
| Specifications and details for Wraith III engine units No. 3, No. 4 (Test Bed), and No. 5. | 3rd Jun 1938 | Box 155 \ 2 scan0224 | |
| Specification updates for Wraith III units No. 5, 6, 7, and 8. | 3rd Jun 1938 | Box 155 \ 2 scan0225 | |
| Specification sheet detailing modifications and components for various Wraith and B.III engine units. | 3rd Jun 1938 | Box 155 \ 2 scan0226 | |
| Specifications for B.III No.2 and No.3 Units, detailing component changes and exceptions. | 3rd Jun 1938 | Box 155 \ 2 scan0227 | |
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