| Description | Date | Identifier | |
| 20/25 HP tank engines and an attached letter to the War Office. | 24th Feb 1933 | Box 5 \ 1 01-page133 | |
| Letter to the Director of Army Contracts confirming the finalized position for a filter unit on a 20/25 HP Tank Engine. | 24th Feb 1933 | Box 5 \ 1 01-page134 | |
| Road tests and modifications for a 25 HP car, chassis 18-G4. | 14th Mar 1933 | Box 5 \ 1 01-page135 | |
| Requesting an urgent update on developments for a silent second speed, new dampers, axle control and air silencer. | 27th Mar 1933 | Box 5 \ 1 01-page136 | |
| Road tests for car 18-G4, detailing issues and modifications for new type shock absorbers. | 27th May 1933 | Box 5 \ 1 01-page137 | |
| Road tests of car 18-G4, specifically regarding the silent second speed and modifications to the shock absorbers. | 20th Mar 1933 | Box 5 \ 1 01-page138 | |
| Use of current versus adjustable shock absorbers on the 20/25 chassis. | 29th Mar 1933 | Box 5 \ 1 01-page139 | |
| Testing, comparison, and future development plans for the J.III car. | 31th Mar 1933 | Box 5 \ 1 01-page140 | |
| Instructions for attention points on the J.S. Car concerning carburetion, ignition advance, and engine mounting. | 1st Mar 1933 | Box 5 \ 1 01-page141 | |
| Development progress on a vehicle's engine mounting, steering, clutch, exhaust system, and brakes. | 31th Mar 1933 | Box 5 \ 1 01-page142 | |
| Servo cams, silent tappets, and preparations for a car demonstration at Brooklands. | 3rd Apr 1933 | Box 5 \ 1 01-page143 | |
| Request to fit a 40/50 HP type exhaust cut-out for open exhaust tests at Brooklands. | 3rd Apr 1933 | Box 5 \ 1 01-page144 | |
| Requesting a new set of push rods, .175' longer, to compensate for an incorrect cylinder head fitting. | 3rd Apr 1933 | Box 5 \ 1 01-page145 | |
| Confirming arrangements to bring a J.III car and a standard 20/25 limousine to Brooklands. | 3rd Apr 1933 | Box 5 \ 1 01-page146 | |
| Covering memo for a programme detailing 200 chassis (Nos. 4701-4900) of the 20/25 HP, A2 Series. | 4th Apr 1933 | Box 5 \ 1 01-page147 | |
| Production schedule and key dates for the 20/25 HP Chassis 'A2' Series. | 27th Mar 1933 | Box 5 \ 1 01-page148 | |
| Seven points of observation for a car undergoing a 10,000-mile test run. | 13th Apr 1933 | Box 5 \ 1 01-page149 | |
| Future improvements for the 25 HP and Phantom II Continental models, including the J.III engine. | 28th Apr 1932 | Box 5 \ 1 01-page150 | |
| Proposal to create a new Continental type car by fitting a 7.1 engine into a modified Bensport chassis. | 26th Apr 1933 | Box 5 \ 1 01-page151 | |
| Future car development, engine configurations for the Phantom II Continental and J.III chassis, and performance improvements. | 26th Apr 1933 | Box 5 \ 1 01-page152 | |
| Confirming the requirement for an oil cooler for the J.III engine, with design data to be provided from ongoing Peregrine experiments. | 9th May 1933 | Box 5 \ 1 01-page153 | |
| List of parts requiring modification or attention following tests on the 1.J.III Chassis. | 12th May 1933 | Box 5 \ 1 01-page154 | |
| List of vehicle faults and required repairs for the exhaust, frame, and electrical systems. | 25th May 1933 | Box 5 \ 1 01-page155 | |
| Outlining required modifications for the experimental J.111 Bentley car. | 25th May 1933 | Box 5 \ 1 01-page156 | |
| Page 2 of a memorandum explaining why no action is being taken on project J.111. | 25th May 1933 | Box 5 \ 1 01-page157 | |
| Engine wear after 45,000 miles, focusing on piston ring travel and comparing it to repair cases. | 30th May 1933 | Box 5 \ 1 01-page158 | |
| Measurement chart and diagram for cylinder bore diameters on a Beveridge G.S. CX. Unit. | 30th May 1931 | Box 5 \ 1 01-page159 | |
| Comparing the silence and vibration of competitor's cars against Rolls-Royce models, noting the need for improvement. | 16th Jun 1933 | Box 5 \ 1 01-page160 | |
| Completion of mileage tests in France for car 18-G4, its new features, and seeking instructions for its return. | 16th Jun 1933 | Box 5 \ 1 01-page161 | |
| Preparations for car J.III to be used in a demonstration of variable control dampers. | 27th Jun 1933 | Box 5 \ 1 01-page162 | |
| Outstanding modifications required for the J.III car. | 27th May 1933 | Box 5 \ 1 01-page163 | |
| Results of a 15,000-mile test in France, focusing on fuel consumption and cooling system performance. | 4th Jul 1933 | Box 5 \ 1 01-page164 | |
| Vehicle component testing, discussing issues and proposed standardisation for the fan, damper, gearbox, axle, and brakes. | 4th Jul 1933 | Box 5 \ 1 01-page165 | |
| Report page discussing issues and potential improvements for shock absorbers, exhaust systems, dynamos, ignition, and a stop-lamp switch. | 4th Jul 1933 | Box 5 \ 1 01-page166 | |
| Note on the expected engine oil consumption for a car. | 5th Jul 1933 | Box 5 \ 1 01-page167 | |
| Responding to component performance remarks following a 15,000-mile test of the 18-G4 model in France. | 5th Jul 1933 | Box 5 \ 1 01-page168 | |
| Proposed changes and performance of brakes, dampers, exhaust, ignition, and other vehicle systems. | 5th Jul 1933 | Box 5 \ 1 01-page169 | |
| Clarifying a misunderstanding about the carburetter and thermostatic control for a 15,000 Miles Test in France. | 6th Jul 1933 | Box 5 \ 1 01-page170 | |
| Drawing LeC.3541 for a 20/25 HP engine breather modification, referencing the Bentley design. | 7th Jul 1933 | Box 5 \ 1 01-page171 | |
| Concerning engine smoke on a Supermarines aircraft. | 16th Jul 1933 | Box 5 \ 1 01-page172 | |
| Part failures on Bentley models, improvements made, and comparison to the 20/25 model. | 16th Jul 1933 | Box 5 \ 1 01-page173 | |
| List of points requiring manufacture, detailing, and experimental work for a vehicle chassis. | 19th Apr 1933 | Box 5 \ 1 01-page174 | |
| Drawings LeC.3585 and LeC.3591 for the J.3 Engine, detailing a change in timing gear location. | 4th Aug 1933 | Box 5 \ 1 01-page175 | |
| Observations on the performance of a 20/25 HP experimental car with a green body. | 31th Aug 1933 | Box 5 \ 1 01-page176 | |
| Blank statement of account form from the French branch. | 31th Aug 1933 | Box 5 \ 1 01-page177 | |
| Driver's test report detailing issues with brakes, driving comfort, engine starting, and fumes within the cabin. | 31th Aug 1933 | Box 5 \ 1 01-page178 | |
| Arrangements for the final stages and dismantling of a 100-hour test on an oiling modification for 20/25HP tank engines. | 6th Sep 1933 | Box 5 \ 1 01-page179 | |
| On the results of a 100-hour test of an oiling modification for 20/25HP tank engines. | 6th Sep 1938 | Box 5 \ 1 01-page180 | |
| 100-hour test of a 20/25HP Tank Engine, detailing oil retention and component modifications. | 9th Sep 1933 | Box 5 \ 1 01-page181 | |
| Recommending improvements and standardization of parts for the 25 HP model, referencing Bentley components. | 3rd Nov 1933 | Box 5 \ 1 01-page182 | |
| Difficulties of fitting a 25 HP engine into a lengthened Peregrine chassis. | 21th Nov 1933 | Box 5 \ 1 01-page183 | |
| 10,000-mile test run for a new experimental car and the standardization of its parts for the next show. | 22th Nov 1933 | Box 5 \ 1 01-page184 | |
| Difficulties with a proposal to improve the 20/25 car using a lengthened Peregrine chassis. | 23th Nov 1933 | Box 5 \ 1 01-page185 | |
| The disappointing test results of balanced crankshafts in Goshawk engines 3 and 35. | 20th Jan 1934 | Box 5 \ 1 01-page186 | |
| Introduction of an 8-cylinder engine for the 20/25 model, with comparisons to Terraplane and Ford-8 engines. | 1st Feb 1934 | Box 5 \ 1 01-page187 | |
| Proposal for fitting a Terraplane engine into a 20/25 chassis, outlining required modifications. | 7th Feb 1934 | Box 5 \ 1 01-page188 | |
| The dispatch of documents regarding Spring Drive, Slipper Flywheel, Wheelcase Facing, and Bolt spacing. | 9th Feb 1934 | Box 5 \ 1 01-page189 | |
| Secret memo requesting two second-hand open touring bodies for 'India' chassis tests. | 2nd Mar 1925 | Box 5 \ 2 02-page001 | |
| Instructions for trimming, painting, and delivering two bodies for a 20 HP experimental chassis. | 6th Mar 1925 | Box 5 \ 2 02-page002 | |
| Secret memo discussing the preference for open bodies for testing 'India' models due to noise issues with closed bodies. | 30th Mar 1925 | Box 5 \ 2 02-page003 | |
| Confirming an agreement for 'Open bodies' arrangements. | 3rd Apr 1925 | Box 5 \ 2 02-page004 | |
| Faults with car bodies, specifically the back seat height and the aesthetic appearance of a Windover body. | 13th May 1925 | Box 5 \ 2 02-page005 | |
| Cabriolet body designs for an 'India' subframe and the potential reuse of a Landaulette body from another chassis. | 13th Jun 1925 | Box 5 \ 2 02-page006 | |
| Authorizing work to be carried out on a car by Sanderson & Holmes Ltd. | 1st Jun 1925 | Box 5 \ 2 02-page007 | |
| Secret memo discussing the build specifications and schedule for Mr. Royce's 20 HP car. | 24th Jun 1925 | Box 5 \ 2 02-page008 | |
| Notification of Barker's reference number for an Enclosed Cabriolet body on a 20-HP subframe. | 2nd Jul 1925 | Box 5 \ 2 02-page009 | |
| Letter to coachbuilders Barker & Co. regarding the purchase and modification of a 20HP Cabriolet de Ville body. | 2nd Jul 1925 | Box 5 \ 2 02-page010 | |
| Secret memorandum discussing subframe bodies, chassis specifications, and coordination with Barkers for the 'India' project. | 27th Aug 1925 | Box 5 \ 2 02-page011 | |
| Despatch of a 20 HP subframe to Messrs. Barkers for a Cabriolet body. | 1st Jul 1925 | Box 5 \ 2 02-page012 | |
| Instruction memo to Messrs. Sanderson & Holmes Ltd. to carry out work on chassis 8-G-111. | 20th Jul 1925 | Box 5 \ 2 02-page013 | |
| 'Hs' to 'O.O.' authorising work to be done on car 9-G-111 by Sanderson & Holmes Ltd. | 3rd Dec 1926 | Box 5 \ 2 02-page014 | |
| Origin of chassis numbers 8-O-S and 9-O-S. | 1st Sep 1925 | Box 5 \ 2 02-page015 | |
| Chassis development, body fitting for a 20HP model, and plans for an experimental Sports Car. | 11th Sep 1925 | Box 5 \ 2 02-page016 | |
| Page 2, discussing chassis type, wings, and windscreen for the Riviera Sports car. | 11th Sep 1925 | Box 5 \ 2 02-page017 | |
| Secret memo confirming a phone conversation about modifications and issues with subframe bodies and chassis. | 23th Sep 1925 | Box 5 \ 2 02-page018 | |
| Telegram requesting modification of a chassis to suit a Barker subframe and steering. | 31th Jul 1925 | Box 5 \ 2 02-page019 | |
| Chassis modifications for a 'Cabriolet de Ville' for India to accommodate a short driver. | 25th Sep 1925 | Box 5 \ 2 02-page020 | |
| Issues with a 20 HP chassis (10-G-111) sent to Barkers, specifically incorrect steering and pedals. | 26th Sep 1925 | Box 5 \ 2 02-page021 | |
| Inquiry about the supply of new front wings for a 20 HP 'India' chassis with a Windover open touring body. | 25th Sep 1925 | Box 5 \ 2 02-page022 | |
| Design of car bodies, advocating against heavy and cramped designs and praising a new Windovers scheme. | 27th Oct 1925 | Box 5 \ 2 02-page023 | |
| Progress report on experimental coachwork for various car models and chassis. | 9th Dec 1925 | Box 5 \ 2 02-page024 | |
| Failure of red fibre door wedges on a new Barker Cabriolet due to swelling from moisture. | 4th Jan 1926 | Box 5 \ 2 02-page025 | |
| Use and potential atmospheric degradation of fibre wedges on body doors. | 8th Jan 1926 | Box 5 \ 2 02-page026 | |
| Instruction for Messrs. Sanderson & Holmes Ltd. to carry out work on chassis 10-G-111 per the attached estimate. | 8th Jan 1926 | Box 5 \ 2 02-page027 | |
| Instruction memo to arrange for work to be carried out on car 9-G-111 by Messrs. Sanderson & Holmes Ltd. | 21th Jan 1926 | Box 5 \ 2 02-page028 | |
| Authorising work on car 9-G-111 by Sanderson & Holmes Ltd. | 25th Jan 1926 | Box 5 \ 2 02-page029 | |
| Instructing for work to be carried out on a car by Messrs. Sanderson & Holmes Ltd. | 1st Feb 1926 | Box 5 \ 2 02-page030 | |
| Instructing for work to be carried out on car 9-G-111 by Sanderson & Holmes Ltd. | 2nd Feb 1926 | Box 5 \ 2 02-page031 | |
| Authorising work to be carried out on a car by Messrs. Sanderson & Holmes Ltd. | 5th Mar 1926 | Box 5 \ 2 02-page032 | |
| The weight of a body subframe and floorboard fitting for a 20 HP cabriolet. | 20th Mar 1926 | Box 5 \ 2 02-page033 | |
| Authorising work to be carried out on a car by Messrs. Sanderson & Holmes Ltd. | 26th Mar 1926 | Box 5 \ 2 02-page034 | |
| Instruction for Messrs. Sanderson & Holmes Ltd. to carry out work on car GF.68 as per an attached estimate. | 19th Apr 1926 | Box 5 \ 2 02-page035 | |
| Authorising work on a car by Messrs. Sanderson & Holmes Ltd. | 29th Apr 1926 | Box 5 \ 2 02-page036 | |
| Trial of a one-piece, top-hinged front windscreen for a 20 HP Saloon Limousine. | 1st May 1926 | Box 5 \ 2 02-page037 | |
| Letter from coachbuilder Hooper & Co. discussing experimental windscreen designs for a 20 HP Saloon Limousine. | 29th Apr 1926 | Box 5 \ 2 02-page038 | |
| Requesting accurate weighing of cars with subframe bodies for the 40/50 and 20 HP models. | 12th May 1926 | Box 5 \ 2 02-page039 | |
| The condition of 10-GIII Barker's All-Weather bodywork after a 10,000-mile test in France, highlighting issues with broken scuttle frame plates. | 16th Jun 1926 | Box 5 \ 2 02-page040 | |
| Faults with a car body, specifically the windscreen and scuttle flexibility on the 7-EX car returned to Barkers. | 8th Jun 1926 | Box 5 \ 2 02-page041 | |
| Structural weaknesses of the 7-EX car body and the need for improved coachbuilding standards. | 19th Jun 1926 | Box 5 \ 2 02-page042 | |
| Instructing the Stores to despatch two brackets, taken from a car body, to Messrs. Barkers. | 19th Jun 1926 | Box 5 \ 2 02-page043 | |
| | | | |
