| Description | Date | Identifier | |
| Graph of vehicle performance readings, including temperatures and fuel consumption, recorded at 25-mile intervals. | 2nd Aug 1934 | Box 82 \ 2 scan0184 | |
| Hand-drawn performance graph tracking vehicle metrics such as speed, fuel consumption, and temperatures over several days. | 2nd Aug 1934 | Box 82 \ 2 scan0185 | |
| Graph charting petrol consumption, water, oil, and air temperatures taken every 25 miles over three days. | 6th Sep 1934 | Box 82 \ 2 scan0186 | |
| Instruction to fit a Terrplane clutch to a chassis before installing the B-1 unit. | 6th Sep 1934 | Box 82 \ 2 scan0187 | |
| Failure of Kelmit big end bearings on 20/25 and Bentley models and the switch to lead bronze bearings. | 7th Sep 1934 | Box 82 \ 2 scan0188 | |
| Clarifying the testing status of a dropped front cross member for car 4-B-IV. | 19th Sep 1934 | Box 82 \ 2 scan0189 | |
| Requesting the results for a 15,000-mile test car trial that ended in a breakdown due to big ends running out. | 7th Sep 1934 | Box 82 \ 2 scan0190 | |
| Clarifying a confusion between two different dropped cross members designed for the Bentley. | 8th Sep 1934 | Box 82 \ 2 scan0191 | |
| Photograph of a failed flexible pipe or hose, sectioned to show internal structure. | 10th Sep 1934 | Box 82 \ 2 scan0192 | |
| Requesting the urgent fitting of a cross member between headlamps onto a specific trials car for testing purposes. | 10th Sep 1934 | Box 82 \ 2 scan0193 | |
| Trial of a higher compression head on a Bentley experimental car. | 19th Sep 1934 | Box 82 \ 2 scan0194 | |
| Request for a Bentley larger oil pump to be returned from France to England. | 19th Sep 1934 | Box 82 \ 2 scan0195 | |
| Engine detonation issues with a high-compression streamlined Bentley. | 22th Sep 1934 | Box 82 \ 2 scan0196 | |
| The overhaul and performance testing of a B-7 unit, detailing issues with gear backlash and adjustments to valve timing. | 27th Sep 1934 | Box 82 \ 2 scan0197 | |
| Engine performance tests, modifications to the cylinder block and gears, and analysis of piston friction, gear rattle, and whine. | 27th Sep 1934 | Box 82 \ 2 scan0198 | |
| Resolving noise issues in a balancing cam mechanism and tappets by fitting new parts. | 15th Sep 1934 | Box 82 \ 2 scan0199 | |
| Performance curves for a B.7 Unit engine with Aerolite Pistons, comparing different valve timings and cylinder configurations. | 15th Sep 1934 | Box 82 \ 2 scan0200 | |
| Chassis repairs for car 5-B-IV and arranging a coachwork inspection at Derby. | 13th Jun 1935 | Box 82 \ 2 scan0201 | |
| Outlining arrangements for testing and inspecting French coach-built cars, including the Paris Trials Car and a Van Vooren bodied car. | 13th Jun 1935 | Box 82 \ 2 scan0202 | |
| Requesting information from the 15,000 miles test report for standardisation purposes. | 13th Jun 1935 | Box 82 \ 2 scan0203 | |
| Correspondence regarding a delay in inspecting a car body due to Mr. Ward of Park Ward being on holiday. | 14th Jun 1935 | Box 82 \ 2 scan0204 | |
| The standardization of parts for the 10,000 Miles Car, listing items cleared for production and those for which standardization has started. | 14th Jun 1935 | Box 82 \ 2 scan0205 | |
| Component parts performance report following a 10,000-mile test. | 14th Jun 1935 | Box 82 \ 2 scan0206 | |
| List of standard parts causing trouble that are scheduled for alteration and improvement. | 14th Jun 1935 | Box 82 \ 2 scan0207 | |
| Requesting an examination of the gearbox, back axle, and servo from car 5-B-IV after running on a new lubricant. | 18th Jun 1935 | Box 82 \ 2 scan0208 | |
| Authorisation to pay an invoice for two Lockhead flexes ordered by telephone. | 24th Jun 1935 | Box 82 \ 2 scan0209 | |
| Official order for two Lockhead Flexes from S. Smith & Sons Ltd. | 25th Jun 1935 | Box 82 \ 2 scan0210 | |
| Telegram from Robotham to Hancock in France regarding tests to cure vapour lock. | 25th Jun 1935 | Box 82 \ 2 scan0211 | |
| Arranging for a 5-B-IV frame and body to be sent to Park Wards for coachwork repairs. | 27th Jun 1935 | Box 82 \ 2 scan0212 | |
| Instruction to arrange delivery of a 5-B-IV Bentley chassis to Park Wards. | 27th Jun 1935 | Box 82 \ 2 scan0213 | |
| Letter from the Experimental Department confirming the dispatch of a chassis and body to Park Ward & Co. Ltd. | 27th Jun 1935 | Box 82 \ 2 scan0214 | |
| Specification for a new chassis, detailing 18 engine components. | 27th Mar 1934 | Box 82 \ 3 scan0001 | |
| List of specifications for the chassis and brake components. | 27th Mar 1934 | Box 82 \ 3 scan0002 | |
| Numbered list of vehicle component specifications and revisions, page 3. | 27th Mar 1934 | Box 82 \ 3 scan0003 | |
| Requesting a specific crankshaft for model 5-B-IV and discussing manufacturing constraints. | 10th Apr 1934 | Box 82 \ 3 scan0004 | |
| Specification for the Engine having the 1' wide Crank Pins with lead bronze Connecting Rod Bearings. | 14th May 1934 | Box 82 \ 3 scan0005 | |
| Completed body and chassis specification for the New Bentley 5-B-IV. | 18th May 1934 | Box 82 \ 3 scan0006 | |
| Revisions to a chassis specification by listing 18 changes to be incorporated into the engine. | 18th May 1934 | Box 82 \ 3 scan0007 | |
| List of specifications and modifications for a vehicle chassis. | 18th May 1934 | Box 82 \ 3 scan0008 | |
| List of specifications for various vehicle components, including the dashboard, pedals, and springs. | 18th May 1934 | Box 82 \ 3 scan0009 | |
| Schematic diagram of a brake linkage system for model 5 B IV, including lever lengths and ratios. | 18th May 1934 | Box 82 \ 3 scan0010 | |
| Blueprint for a Peregrine multiplate servo for direct braking to all wheels. | 18th May 1934 | Box 82 \ 3 scan0011 | |
| Amendment adding a Dropped Front Cross Member and Lamp Standard to a specification. | 31th May 1934 | Box 82 \ 3 scan0012 | |
| Request to fit a front cross member to a Bentley 5 car to eliminate headlamp and wing movement. | 9th Jul 1934 | Box 82 \ 3 scan0013 | |
| Requesting the addition of five specific components to the specification of a Bentley 5 Car. | 27th Jul 1934 | Box 82 \ 3 scan0014 | |
| Directive to change the gearbox specification for the Bentley 5-B-IV from a Peregrine to a standard 20/25 gearbox due to production issues. | 2nd Jun 1934 | Box 82 \ 3 scan0015 | |
| Delays with a Bentley 5 car body and a proposal to amend the gearbox specification to simplify the build. | 3rd Aug 1934 | Box 82 \ 3 scan0016 | |
| Confirmation to fit a temporary unit to vehicle 5-B-IV for it to be sent to the Coachbuilders. | 7th Sep 1934 | Box 82 \ 3 scan0017 | |
| Two design schemes, prioritizing one for front axle control to resolve buckled spring issues and reduce 'jellying'. | 13th Sep 1934 | Box 82 \ 3 scan0018 | |
| Two new designs for the 5-B-IV project: a clutch and a front engine mounting. | 19th Sep 1934 | Box 82 \ 3 scan0019 | |
| Requesting modifications for a 10,000-mile test on a Bentley B-10 unit with a narrow pin crankshaft. | 3rd Oct 1934 | Box 82 \ 3 scan0020 | |
| Specification for model 5-B-IV and suggesting a final diagram for the brake layout. | 3rd Oct 1934 | Box 82 \ 3 scan0021 | |
| Specification sheet detailing the components and modifications for the Engine (B-10 Unit). | 3rd Oct 1934 | Box 82 \ 3 scan0022 | |
| List of part specifications and modifications for a vehicle's chassis and engine. | 3rd Oct 1934 | Box 82 \ 3 scan0023 | |
| Numbered list of technical specifications and modifications for various vehicle components. | 3rd Oct 1934 | Box 82 \ 3 scan0024 | |
| Request to send a set of aluminium shields and brackets for headlamp pillars to Messrs. Park Ward for an Experimental Chassis. | 4th Oct 1934 | Box 82 \ 3 scan0025 | |
| The final specification for chassis and engine 5-B-IV and the streamlined car. | 10th Oct 1934 | Box 82 \ 3 scan0026 | |
| Specification sheet detailing the components and modifications for an engine (B-10 Unit). | 10th Oct 1934 | Box 82 \ 3 scan0027 | |
| Specification sheet detailing modifications to engine and chassis components. | 10th Oct 1934 | Box 82 \ 3 scan0028 | |
| List of technical specifications and updates for various vehicle components. | 10th Oct 1934 | Box 82 \ 3 scan0029 | |
| Specification for a lightened exhaust system for a 10,000-mile trial on a 5-B-IV model. | 12th Oct 1934 | Box 82 \ 3 scan0030 | |
| Lightened exhaust system for 5-B-IV, detailing weight savings and material specifications. | 12th Oct 1934 | Box 82 \ 3 scan0031 | |
| Request to draw up a scheme for a cut-out on the exhaust system for model 5-B-IV. | 15th Oct 1934 | Box 82 \ 3 scan0032 | |
| Requesting to fit a Spectre type fuel pump to chassis 5-B-IV, detailing the required modifications. | 16th Oct 1934 | Box 82 \ 3 scan0033 | |
| Dispatch request for a front apron, fittings, and horns to be sent to Messrs. Park Ward. | 17th Oct 1934 | Box 82 \ 3 scan0034 | |
| Dispatch of a Front Apron and Horns for car 5-B-IV to Messrs. Park Wards. | 17th Oct 1934 | Box 82 \ 3 scan0035 | |
| Fitting heavier brake drums with deeper ribs to model 5-B-IV to combat high temperatures. | 19th Oct 1934 | Box 82 \ 3 scan0036 | |
| Instruction to use Wakefield Hi-Press oil for a rear axle, specifically noting not to use Whitmore oil. | 25th Oct 1934 | Box 82 \ 3 scan0037 | |
| Modification to the rear silencer of an exhaust system. | 25th Oct 1934 | Box 82 \ 3 scan0038 | |
| Communication regarding the feasibility of fitting Marschall headlamps to a model 5-B-4 without special brackets. | 26th Oct 1934 | Box 82 \ 3 scan0039 | |
| Requesting a progress update on 5-B-IV, stating that parts are ready for a 10,000-mile chassis run. | 26th Oct 1934 | Box 82 \ 3 scan0040 | |
| List of modifications and features incorporated into the 10,000 Miles Bentley chassis, model 5-B-IV. | 26th Oct 1934 | Box 82 \ 3 scan0041 | |
| Numbered list detailing vehicle component specifications and modifications for an engine. | 26th Oct 1934 | Box 82 \ 3 scan0042 | |
| The approximate start date for a test on Bentley Car 5-B-IV. | 29th Oct 1934 | Box 82 \ 3 scan0043 | |
| Implementation of adjustable brake ropes for the 5-B-IV brake layout. | 29th Oct 1934 | Box 82 \ 3 scan0044 | |
| Inquiring if a lightened front crossmember modification is still to be fitted to chassis 5-B-IV. | 29th Oct 1934 | Box 82 \ 3 scan0045 | |
| Testing a lightened type cross member on one car before fitting it to another. | 30th Oct 1934 | Box 82 \ 3 scan0046 | |
| Short typed memo regarding the fitting of Smith Jacks to a vehicle, model 5-B-IV. | 30th Oct 1934 | Box 82 \ 3 scan0047 | |
| Fitting superior Ferodo B.Z. brake linings to model 5-B-IV. | 2nd Nov 1934 | Box 82 \ 3 scan0048 | |
| Requesting a Crankcase Lower Half for the Magnesium Castings for 5-B-IV. | 2nd Nov 1934 | Box 82 \ 3 scan0049 | |
| Request to dispatch a complete kit of tools to Messrs. Park Ward for a chassis having its body fitted. | 2nd Nov 1934 | Box 82 \ 3 scan0050 | |
| Letter to Park Ward & Co. Ltd. clarifying confusion regarding the despatch of tool kits for chassis models 4-B-IV and 5-B-IV. | 5th Nov 1934 | Box 82 \ 3 scan0051 | |
| Confirming a car will be ready for collection on a specific date. | 8th Nov 1934 | Box 82 \ 3 scan0052 | |
| Follow-up note regarding the start of testing for Bentley Car 5-B-IV. | 8th Nov 1934 | Box 82 \ 3 scan0053 | |
| Car's delay from the coachbuilders, required modifications including a new clutch and bumper, and urgent work on a Bentley. | 9th Nov 1934 | Box 82 \ 3 scan0054 | |
| Requesting a driver to collect vehicle 5-B-IV from Park Wards and bring it to Derby. | 9th Nov 1934 | Box 82 \ 3 scan0055 | |
| Request to produce engine side guards without louvres for a Bentley due to a customer complaint about snow ingress. | 13th Nov 1934 | Box 82 \ 3 scan0056 | |
| Front, rear, and total weight measurements. | 15th Nov 1934 | Box 82 \ 3 scan0057 | |
| The creation of front and rear number plates for car 5-B-IV. | 16th Nov 1934 | Box 82 \ 3 scan0058 | |
| Request for the weights of various car body extras and components. | 19th Nov 1934 | Box 82 \ 3 scan0059 | |
| Requesting an order for a special rear number plate for a car. | 26th Nov 1934 | Box 82 \ 3 scan0060 | |
| Request for the weights of various car body modifications and a standard Bentley part. | 26th Nov 1934 | Box 82 \ 3 scan0061 | |
| Copy of a request to cast one front number plate for a car with registration RC.2344. | 26th Nov 1934 | Box 82 \ 3 scan0062 | |
| Letter to S. Smith & Co. regarding a fractured Jackall jack bracket from a 5-B-IV chassis. | 26th Nov 1934 | Box 82 \ 3 scan0063 | |
| Letter discussing fitting brackets to a car in the shop and the satisfactory condition of the jacks. | 26th Nov 1934 | Box 82 \ 3 scan0064 | |
| The coachwork weight and complete kerb weight of a car with non-standard features. | 26th Nov 1934 | Box 82 \ 3 scan0065 | |
| Refitting of hydraulic jacks with modified front brackets on chassis 5-B-IV. | 27th Nov 1934 | Box 82 \ 3 scan0066 | |
| Hydraulic jacks on 5-B-IV, attaching a drawing for front and rear axle fittings. | 28th Nov 1934 | Box 82 \ 3 scan0067 | |
| Excessive weight of the coachwork on an experimental car. | 28th Nov 1934 | Box 82 \ 3 scan0068 | |
| Weight of the experimental car 5-B-IV body compared to standard Bentley Saloons. | 1st Dec 1934 | Box 82 \ 3 scan0069 | |
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