| Description | Date | Identifier | |
| Testing, modifications, and manufacturing of a Ph.III petrol filter. | 11th Feb 1936 | Box 135 \ 2 scan0144 | |
| Quotation letter from Brown Brothers Ltd for various aeronautical parts. | 11th Feb 1936 | Box 135 \ 2 scan0145 | |
| Scheme to fit two petrol filters to existing Bentley cars. | 13th Feb 1936 | Box 135 \ 2 scan0146 | |
| Agreeing to use scheme LeC.4993 for fitting two petrol filters to 3 1/2 and 4 1/4 litre Bentley chassis. | 18th Feb 1936 | Box 135 \ 2 scan0147 | |
| New petrol filter scheme for Bentley cars to address vapour lock issues. | 14th Feb 1936 | Box 135 \ 2 scan0148 | |
| Requesting the replacement of a petrol filter for chassis 34-EX. | 2nd Mar 1936 | Box 135 \ 2 scan0149 | |
| Instruction to build a petrol filter LeC.4721, required for chassis 32-EX. | 2nd Mar 1936 | Box 135 \ 2 scan0150 | |
| Petrol filler cap springs and fitment for Phantom III and Bentley models. | 28th Feb 1936 | Box 135 \ 2 scan0151 | |
| Relocation of the Phantom III petrol filter to avoid weakening the body on certain models. | 26th May 1936 | Box 135 \ 2 scan0152 | |
| The increased production of petrol filters for the Phantom 111 'A' series chassis. | 29th May 1936 | Box 135 \ 2 scan0153 | |
| Minimum number of petrol filters on the side of the frame, referencing opposition from coachbuilders. | 10th Jun 1936 | Box 135 \ 2 scan0154 | |
| Use of a Tecalemit filter for a 15,000 miles engine test. | 27th Jun 1936 | Box 135 \ 2 scan0155 | |
| Requesting an order for Tecalemit filters for experimental chassis unit beds. | 6th Jul 1936 | Box 135 \ 2 scan0156 | |
| Standardisation of parts for relocating the petrol filter to the rear 2nd cross member to assist coachbuilders. | 4th Jul 1936 | Box 135 \ 2 scan0157 | |
| Estimated cost and savings analysis for extra Jigs, Tools and Equipment for the 'B' Series chassis. | 24th Jun 1936 | Box 135 \ 2 scan0158 | |
| Requesting an order for 1 dozen Tecalmit filters for use on experimental chassis unit beds. | 23th Sep 1936 | Box 135 \ 2 scan0159 | |
| Request to build two petrol filters with different drain pipe connections to drawing LeC.5416. | 18th Feb 1937 | Box 135 \ 2 scan0160 | |
| Request to manufacture necessary parts for a petrol filter to be fitted to vehicle 22-G-V. | 9th Apr 1937 | Box 135 \ 2 scan0161 | |
| Instruction to apply an Anodio Oxidisation Process to aluminium petrol filter covers to prevent corrosion. | 12th Apr 1937 | Box 135 \ 2 scan0162 | |
| Investigation into carburetter flooding, identifying fine aluminium turnings from the filter assembly as the root cause. | 20th May 1937 | Box 135 \ 2 scan0163 | |
| Petrol flow tests and filter performance for the Phantom III engine. | 20th May 1937 | Box 135 \ 2 scan0164 | |
| Instruction to change the petrol filter gauze on Experimental Phantom engines. | 20th May 1937 | Box 135 \ 2 scan0165 | |
| Temperature tests conducted to evaluate a filter position on the 25/30 model. | 31th May 1937 | Box 135 \ 2 scan0166 | |
| Standardisation of Phantom III filter body, filter gauze, and filter chamber plug. | 20th May 1937 | Box 135 \ 2 scan0167 | |
| Cost estimation and approval record for part standardisation on the 'E' Series chassis. | 24th Jun 1931 | Box 135 \ 2 scan0168 | |
| Scheme for the petrol filter piping and wiring conduits on a Wraith III. | 27th Oct 1937 | Box 135 \ 2 scan0169 | |
| Chassis engine tests and the use of Tecalemit filters during engine cleansing. | 22th Dec 1937 | Box 135 \ 2 scan0170 | |
| The testing of granulated cork washers for use in a petrol filter. | 7th Jan 1938 | Box 135 \ 2 scan0171 | |
| Confirming instructions will be issued to revert to plain cork washers for petrol filters. | 14th Jun 1938 | Box 135 \ 2 scan0172 | |
| Petrol and oil filtration systems, including a reference to Flexofiltration Limited. | 19th Dec 1938 | Box 135 \ 2 scan0173 | |
| Request to take photomicrographs of attached petrol filter gauges. | 20th Feb 1940 | Box 135 \ 2 scan0174 | |
| Laboratory report on photomacrographs taken of four different types of petrol filter gauzes. | 29th Feb 1940 | Box 135 \ 2 scan0175 | |
| Modification to the petrol filter location on eight-cylinder engines to prevent fuel boiling. | 30th Apr 1940 | Box 135 \ 2 scan0176 | |
| Completed chassis and engine repairs on car 10.B.V. for Air Chief Marshall Harris. | 31th Mar 1944 | Box 135 \ 2 scan0177 | |
| List of maintenance actions including part replacements and adjustments for the clutch, gearbox, and axles. | 31th Mar 1944 | Box 135 \ 2 scan0178 | |
| List of repairs and parts fitted to a vehicle, covering brakes, suspension, exhaust, shock dampers, cooling and electrical systems. | 31th Mar 1944 | Box 135 \ 2 scan0179 | |
| The repair and replacement of a dynamo and other electrical components, with total man-hours. | 29th Mar 1944 | Box 135 \ 2 scan0180 | |
| Specification for the overhaul of Bentley Chassis 10.B.V., detailing work on steering, suspension, and axles. | 29th Mar 1944 | Box 135 \ 2 scan0181 | |
| Parts list for rear brakes, hubs, and brake drums, noting new liners fitted. | 29th Mar 1944 | Box 135 \ 2 scan0182 | |
| Listing chassis and unit mileages and statuses up to 29th February 1944. | 4th Mar 1944 | Box 135 \ 2 scan0183 | |
| Confidential memo confirming chassis suffix letters, numbers, and coachbuilders for Senior Range cars. | 1st Mar 1944 | Box 135 \ 2 scan0184 | |
| Major complaints and suggested actions for car components, specifically the gearbox and brakes. | 29th Sep 1943 | Box 135 \ 2 scan0185 | |
| Failures and modifications related to steering and transmission components. | 29th Sep 1943 | Box 135 \ 2 scan0186 | |
| Issues and cures for the clutch trunnion, propeller shaft, transmission, and suspension dampers. | 29th Sep 1943 | Box 135 \ 2 scan0187 | |
| Component failures and tests for spring interleaving, triangle levers, cooling systems, and engines. | 29th Sep 1943 | Box 135 \ 2 scan0188 | |
| Carburettor performance and miscellaneous vehicle faults. | 17th Sep 1943 | Box 135 \ 2 scan0189 | |
| Confidential memo discussing the car programme, specifically body and chassis dimensions for post-war models. | 17th Sep 1943 | Box 135 \ 2 scan0190 | |
| Proposal to rationalize car frames and engine combinations across Bentley and Rolls-Royce models. | 17th Sep 1943 | Box 135 \ 2 scan0191 | |
| Production programme for Bentley and Rolls-Royce bonnets. | 17th Sep 1943 | Box 135 \ 2 scan0192 | |
| Criticism over car usage and the arrangement of new bus services between Belper, Derby and Hucknall. | 2nd Jun 1942 | Box 135 \ 2 scan0193 | |
| Continued use of experimental cars for testing and data collection during wartime. | 4th May 1942 | Box 135 \ 2 scan0194 | |
| On altering the company car fleet due to petrol and tyre restrictions, and camouflaging vehicles for national work. | 15th Apr 1942 | Box 135 \ 2 scan0195 | |
| Unsatisfactory state of the transport fleet at the Clan Foundry, listing vehicles, mileages, and justifications for new vehicles. | 3rd May 1942 | Box 135 \ 2 scan0196 | |
| State and usage of company vehicles, including commercial and experimental cars. | 3rd May 1942 | Box 135 \ 2 scan0197 | |
| Progress report on mileage and faults for the Senior Range Rationalised Chassis, focusing on gearbox issues. | 14th Jun 1941 | Box 135 \ 2 scan0198 | |
| Progress report on issues and modifications for various vehicle components. | 15th Jun 1941 | Box 135 \ 2 scan0199 | |
| Report page detailing issues and experiments related to petrol consumption, cylinder bore wear, and bearing failures. | 15th Jun 1941 | Box 135 \ 2 scan0200 | |
| Progress report on engine testing, manufacturing, and the development of the 'Myth' chassis and components. | 13th Jun 1941 | Box 135 \ 2 scan0201 | |
| The development of a larger four-cylinder engine and comparative testing of small cars. | 15th Jun 1941 | Box 135 \ 2 scan0202 | |
| Interim report on the performance and durability of small cars from Vauxhall, Austin, Morris, and Studebaker. | 19th Mar 1944 | Box 135 \ 2 scan0203 | |
| Vehicle failures and comparing the performance of competitor cars. | 30th May 1941 | Box 135 \ 2 scan0204 | |
| Restricting access to Shardlow Garage sheds storing experimental cars, jigs, and secret tank parts. | 14th Apr 1942 | Box 135 \ 2 scan0205 | |
| Experimental car troubles from March 1940, covering engine mountings, pistons, oil leaks, and cylinder wear. | 14th Aug 1940 | Box 135 \ 2 scan0206 | |
| The performance and issues with harmonic crank dampers, carburation, and water systems on various car models. | 14th Aug 1940 | Box 135 \ 2 scan0207 | |
| Radiator and electrical equipment failures and developments. | 14th Aug 1940 | Box 135 \ 2 scan0208 | |
| Various component failures and investigations, including coils, petrol pumps, dynamos, and sparking plugs. | 14th Aug 1940 | Box 135 \ 2 scan0209 | |
| Various mechanical issues including speedometer cables, clutches, and gearboxes. | 14th Aug 1940 | Box 135 \ 2 scan0210 | |
| Gearbox, propeller shaft, and brake issues on various vehicle models. | 14th Aug 1940 | Box 135 \ 2 scan0211 | |
| Steering and suspension issues, including wheel tests, shock absorber failures, and spring interleaving trials. | 14th Aug 1940 | Box 135 \ 2 scan0212 | |
| Issues and modifications for Bijour pipes, exhaust systems, pedal rattles, and jacks on various car models. | 14th Aug 1940 | Box 135 \ 2 scan0213 | |
| Vehicle component issues and design feedback for the jacking system, number plates, headlamps, coachwork, and instrument boards. | 14th Aug 1940 | Box 135 \ 2 scan0214 | |
| Tyre wear, specifically mentioning uneven wear, squealing, and average mileage on various cars. | 14th Aug 1940 | Box 135 \ 2 scan0215 | |
| From Rm/Wym at Clan Foundry to G/GLB, requesting a copy of a previous document. | 24th Jan 1941 | Box 135 \ 2 scan0216 | |
| Proposing experiments on the Borg & Beck clutch centre to address transmission rattles and damping. | 4th Jan 1941 | Box 135 \ 2 scan0217 | |
| The intention for car B-24-GA, as there are sales enquiries for used Bentleys. | 10th Jan 1941 | Box 135 \ 2 scan0218 | |
| Outlining the new procedure for distributing experimental car reports. | 31th Dec 1940 | Box 135 \ 2 scan0219 | |
| Table of Critical Air Temperatures (C.A.T.) for various experimental cars under different test conditions. | 7th Nov 1940 | Box 135 \ 2 scan0220 | |
| File note cross-referencing a document about oil tests on experimental cars. | 29th Oct 1940 | Box 135 \ 2 scan0221 | |
| Fuel and oil consumption checks on two experimental car models. | 20th Oct 1940 | Box 135 \ 2 scan0222 | |
| The fitting of small and large end bushes and bearings to 16 connecting rods for experimental cars. | 8th Oct 1940 | Box 135 \ 2 scan0223 | |
| Big-end bearings of die-cast A.C.9 from an experimental car for Wellworthy Pistons Ltd. | 25th Sep 1940 | Box 135 \ 2 scan0224 | |
| Issues arising from lending experimental cars to the understaffed Transport Department in Derby. | 24th Sep 1940 | Box 135 \ 2 scan0225 | |
| File note referencing correspondence and order numbers related to 'Chassis Development'. | 2nd Sep 1940 | Box 135 \ 2 scan0226 | |
| The Statutory Rules and Orders prohibiting camouflage on road vehicles. | 2nd Sep 1940 | Box 135 \ 2 scan0227 | |
| Letter to Auto-Klean Strainers, Ltd. requesting a meeting with their technical representative to discuss an oil filter. | 7th Mar 1930 | Box 135 \ 3 scan0001 | |
| Letter from Birt Hudson requesting an appointment to discuss 'AUTO-KLEAN' lubricating oil strainers. | 10th Mar 1930 | Box 135 \ 3 scan0002 | |
| Letter to Birt Hudson, Esq. arranging a meeting at the works. | 11th Mar 1930 | Box 135 \ 3 scan0003 | |
| Fifteenth design committee report discussing the Phantom car's oil filter, jellying issues, and a compression ignition unit. | 21th Mar 1930 | Box 135 \ 3 scan0004 | |
| Letter from Benton & Stone Ltd. regarding the testing and provision of a new type of petrol filter with a porous pot element. | 25th Mar 1930 | Box 135 \ 3 scan0005 | |
| Test report on the performance and filtering effectiveness of an 'AUTO-KLEAN' oil strainer. | 6th Apr 1930 | Box 135 \ 3 scan0006 | |
| Continued report on a strainer test, noting rapid clogging and proposing an automatic cleaning mechanism. | 5th Apr 1930 | Box 135 \ 3 scan0007 | |
| Letter to Benton & Stone Ltd. regarding an issue with a porous body filter disintegrating. | 8th Apr 1930 | Box 135 \ 3 scan0008 | |
| Letter from Benton & Stone Ltd. regarding the disintegration of a porous body filter and a proposed modification. | 9th Apr 1930 | Box 135 \ 3 scan0009 | |
| Letter from Birt Hudson regarding 'Auto-Klean' strainers and enclosing a catalogue for discussion. | 10th Apr 1930 | Box 135 \ 3 scan0010 | |
| Letter from Benton & Stone Ltd. advising that a modified porous pot filter has been sent for testing. | 28th Apr 1930 | Box 135 \ 3 scan0011 | |
| Promotional leaflet for Auto-Klean Strainers, a self-cleaning straining appliance. | 24th May 1930 | Box 135 \ 3 scan0012 | |
| Outlining modifications desired for the auto-klean strainer, including the gland and freewheel mechanism. | 24th May 1930 | Box 135 \ 3 scan0013 | |
| Original drawing of an Auto-Klean strainer with details of the freewheel ratchet device. | 26th May 1930 | Box 135 \ 3 scan0014 | |
| Letter to Percy Northey discussing Duron brake lining material and forwarding correspondence from an Engineer Admiral. | 18th Jul 1930 | Box 135 \ 3 scan0015 | |
| Letter from W. Pattey proposing a trial of a new oil filter from Metafilters Ltd. | 8th Jul 1930 | Box 135 \ 3 scan0016 | |
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