| Description | Date | Identifier | |
| Weight, spring, and buffer clearance specifications for car 4-B-IV. | 7th Nov 1934 | Box 88 \ 2 scan0068 | |
| Inquiry requesting details on compression ratio, horsepower, and performance gains after a test drive showed no disadvantages. | 26th Nov 1934 | Box 88 \ 2 scan0069 | |
| Dangerous test drive experience with a car exhibiting severe brake judder and front-wheel wobble. | 26th Nov 1934 | Box 88 \ 2 scan0070 | |
| On engine modifications for Bentley model 4-B-IV, comparing compression ratios and noting horsepower increase. | 28th Nov 1934 | Box 88 \ 2 scan0071 | |
| Component 4-B-IV be sent to Derby for investigation into a reported issue. | 28th Nov 1934 | Box 88 \ 2 scan0072 | |
| Return of an unsafe car by train, awaiting a report. | 29th Nov 1934 | Box 88 \ 2 scan0073 | |
| Letter of apology regarding issues with car 4 BIV and arranging future correspondence. | 6th Dec 1934 | Box 88 \ 2 scan0074 | |
| Memo to 'R_m' about a missed meeting and a purchased tyre from Burck Ltd available in England. | 6th Dec 1934 | Box 88 \ 2 scan0075 | |
| Findings from a car inspection, including broken shafts, incorrect damper loads, and a low-speed wobble. | 8th Dec 1934 | Box 88 \ 2 scan0076 | |
| Private letter discussing brake judders on car 4.B.IV and improvements to another vehicle. | 10th Dec 1934 | Box 88 \ 2 scan0077 | |
| Test drive of the Trials Car, commenting on its Vanden Plas body, one-piece wings, and the performance of its high axle ratio. | 10th Dec 1934 | Box 88 \ 2 scan0078 | |
| Wing flap in relation to frame frequency on different car body types and axle ratios. | 12th Dec 1934 | Box 88 \ 2 scan0079 | |
| Investigation into brake judders on a Bentley, caused by a sheared control link spindle on the front axle. | 12th Dec 1934 | Box 88 \ 2 scan0080 | |
| List of modifications and parts to be fitted to car 4-B-IV. | 4th Feb 1935 | Box 88 \ 2 scan0081 | |
| Requesting a new petrol pump with improved diaphragms and a small bore induction pipe. | 4th Feb 1935 | Box 88 \ 2 scan0082 | |
| Test drive report on Bentley car 2-B-4, detailing handling, steering wheel improvements, bonnet rattle, warming-up time, and headlamp colour. | 4th Feb 1935 | Box 88 \ 2 scan0083 | |
| Internal memorandum detailing a list of five modifications for a vehicle's brake layout. | 4th Feb 1935 | Box 88 \ 2 scan0084 | |
| Report cover sheet on Bentley Brakes, detailing suggested remedies for fading. | 5th Feb 1935 | Box 88 \ 2 scan0085 | |
| Bentley brake fading issues, diagnosing the problem with the servo and proposing solutions. | 5th Feb 1935 | Box 88 \ 2 scan0086 | |
| Customer objection about brake servo assistance and the risks of improper adjustment. | 5th Feb 1935 | Box 88 \ 2 scan0087 | |
| Instruction to fit part N.Sch.4314 to the servo swinging arm of a car. | 5th Feb 1935 | Box 88 \ 2 scan0088 | |
| Requesting the fitting of two different types of Lodge sparking plugs to a car for testing and mileage recording. | 12th Feb 1935 | Box 88 \ 2 scan0089 | |
| Request to check and potentially re-line the rear brakes of a car. | 13th Feb 1935 | Box 88 \ 2 scan0090 | |
| Work instruction memo detailing tasks for car 4-B-IV. | 6th Mar 1935 | Box 88 \ 2 scan0091 | |
| Request for a longer petrol tap connection and oil union for the fitting of isolated floorboards on a car. | 14th Mar 1935 | Box 88 \ 2 scan0092 | |
| Replacement of white metal big end bearings with lead bronze bearings in a B-7 unit. | 22th Mar 1935 | Box 88 \ 2 scan0093 | |
| Short typed memo confirming a telephone conversation and a visit to Derby. | 2nd Apr 1935 | Box 88 \ 2 scan0094 | |
| Fitting of a high compression cylinder head and other jobs on a 20/25 car. | 3rd Apr 1935 | Box 88 \ 2 scan0095 | |
| From 'C.' to 'F. Dodd' comparing the steering performance of car GAE-19 with car GSF-4. | 12th Apr 1935 | Box 88 \ 2 scan0096 | |
| Instruction memo detailing the fitting of a supercharged unit, standard steering, and a specific brake layout to car 3-B-IV. | 24th Apr 1935 | Box 88 \ 2 scan0097 | |
| Recommended changes to the steering tube poundage and oil type for chassis GAE-19. | 24th Apr 1935 | Box 88 \ 2 scan0098 | |
| Request memo to remove wheels, tyres, a cylinder head, and a servo mechanism from car 3-B-IV for testing. | 24th Apr 1935 | Box 88 \ 2 scan0099 | |
| Complaints from Jack Barclay about his trials car, chassis B-146-AH, specifically a squeaky clutch and a rattle from the silencer. | 1st May 1935 | Box 88 \ 2 scan0100 | |
| List of complaints made by Mr. Jack Barclay regarding Chassis B-146-AH. | 11th May 1935 | Box 88 \ 2 scan0101 | |
| Fitting a Y-4-BB unit to a car to examine the existing B-5 unit's Textolite gears and lead bronze bearings. | 11th May 1935 | Box 88 \ 2 scan0102 | |
| Confirming a meeting appointment at Bignall's Corner. | 14th May 1935 | Box 88 \ 2 scan0103 | |
| Log of mileage tests for a component labelled '4BIV', including dates and a final calculation. | 15th May 1935 | Box 88 \ 2 scan0104 | |
| Adding ballast to Bentley cars for a comparative test at Bignall's Corner. | 15th May 1935 | Box 88 \ 2 scan0105 | |
| The fitting of a new unit and the replacement of a servo on a Bentley's car. | 16th May 1935 | Box 88 \ 2 scan0106 | |
| Telegram requesting specific carburetter needles for big bore engines. | 16th May 1935 | Box 88 \ 2 scan0107 | |
| Advertising value of motor tests and being conservative with quoted maximum speeds. | 21th May 1935 | Box 88 \ 2 scan0108 | |
| Instruction to fit a dropped front cross member and bumper bar to car 4-B-IV. | 22th May 1935 | Box 88 \ 2 scan0109 | |
| The loan of a Bentley car to Lord Nuffield and the enclosed copy of a letter received from him. | 28th May 1935 | Box 88 \ 2 scan0110 | |
| Letter from Lord Nuffield of Morris Motors to Mr. Sidgreaves providing feedback after testing a Bentley. | 27th May 1935 | Box 88 \ 2 scan0111 | |
| Fitting a servo with splined linings to the gearbox of car chassis 2-B-IV. | 17th Jun 1935 | Box 88 \ 2 scan0112 | |
| Modifications to the brake levers and cams for the servo system on a car. | 18th Jun 1935 | Box 88 \ 2 scan0113 | |
| Confirming a special fan has been removed and a standard fan has been fitted to car 2.B.IV. | 2nd Jul 1935 | Box 88 \ 2 scan0114 | |
| Instructing the exchange of a special lightened fan from car 2-B-IV with a standard fan. | 27th Jun 1935 | Box 88 \ 2 scan0115 | |
| Removal of experimental parts fitted to car 2-B-IV at Derby. | 3rd Jul 1935 | Box 88 \ 2 scan0116 | |
| The return of a chassis from Park Ward to replace experimental parts. | 4th Jul 1935 | Box 88 \ 2 scan0117 | |
| Return of Chassis No. 2.B.IV from Park Ward, with a handwritten note requesting to test the car before the flywheel is removed. | 6th Jul 1935 | Box 88 \ 2 scan0118 | |
| Instructing the Experimental Department to modify a chassis and return it directly to Park Ward. | 6th Jul 1935 | Box 88 \ 2 scan0119 | |
| The delayed arrival of a 2-B-IV chassis and the planned shipment of a B-23-AE chassis to France. | 12th Jul 1935 | Box 88 \ 2 scan0120 | |
| Instruction to remove the engine unit from chassis 2-B-IV and hand it over to the Experimental Dept. | 13th Jul 1935 | Box 88 \ 2 scan0121 | |
| Enamelling and fitting of a Bentley Aluminium Bladed Fan. | 29th May 1935 | Box 88 \ 2 scan0122 | |
| The sale of a car after repairs and questioning whether experimental parts should be removed. | 28th Jun 1935 | Box 88 \ 2 scan0123 | |
| Renovation of car 2-B-1V at Park Ward & Co's works and the replacement of experimental parts before its sale. | 2nd Jul 1935 | Box 88 \ 2 scan0124 | |
| Removing an experimental flywheel and clutch from a car before offering it for sale. | 1st Jul 1935 | Box 88 \ 2 scan0125 | |
| The replacement of an experimental unit in chassis 2-B-IV with unit B-5, including required modifications. | 15th Jul 1935 | Box 88 \ 2 scan0126 | |
| Request to dispatch two leather gear lever covers for a customer's car after they were omitted on a previous visit. | 16th Jul 1935 | Box 88 \ 2 scan0127 | |
| Clutch component changes and trials on a B-5 unit. | 17th Jul 1935 | Box 88 \ 2 scan0128 | |
| The series classification and modifications for chassis No. 2-B-IV. | 18th Jul 1935 | Box 88 \ 2 scan0129 | |
| Handover and classification of chassis 2-B-1V. | 29th Jul 1935 | Box 88 \ 2 scan0130 | |
| Decision not to add hand-controlled shock dampers to a car, following a telephone conversation. | 1st Aug 1935 | Box 88 \ 2 scan0131 | |
| To the repair department with instructions for fitting a B.V. unit to car 2-B-IV. | 1st Aug 1935 | Box 88 \ 2 scan0132 | |
| Car with a faulty clutch being sent for repair at Derby. | 9th Aug 1935 | Box 88 \ 2 scan0133 | |
| Modification to be fitted to Chassis 4-B-IV. | 19th Sep 1935 | Box 88 \ 2 scan0134 | |
| Proposing to secretly fit a set of lightened thick leaf road springs to a customer's car for testing. | 7th Nov 1935 | Box 88 \ 2 scan0135 | |
| Requesting the preparation of parts to fit lightened springs to a specific car. | 8th Nov 1935 | Box 88 \ 2 scan0136 | |
| Requesting a car for clutch tests and to improve oil consumption, with a note of thanks regarding a Leica. | 9th Nov 1935 | Box 88 \ 2 scan0137 | |
| Engine change, oil consumption, and diagnosing plug fouling in a customer's car. | 13th Nov 1935 | Box 88 \ 2 scan0138 | |
| Requesting the fitting of a B-16 unit, road springs, and shock absorbers to chassis 4-B-IV. | 14th Nov 1935 | Box 88 \ 2 scan0139 | |
| To NHC listing cars and the jobs required on them in the workshop. | 14th Nov 1935 | Box 88 \ 2 scan0140 | |
| Instruction to replace the fuel pump mounting bolts with studs on car 4-B-IV. | 14th Nov 1935 | Box 88 \ 2 scan0141 | |
| Requesting the fitment of a carburetter air cleaner, silencer, and ignition control to Large Bore Bentley & 25 HP cars. | 3rd Dec 1935 | Box 88 \ 2 scan0142 | |
| Request to fit a set of the latest aluminium, rubber-covered floorboards and apply a modification to Mr. Lappin's car. | 4th Dec 1935 | Box 88 \ 2 scan0143 | |
| The trial and creation of a rubber mounting for a petrol pump on a Bentley car. | 4th Dec 1935 | Box 88 \ 2 scan0144 | |
| The production and wear inspection of Fabroil timing gears on the Bentley. | 5th Dec 1935 | Box 88 \ 2 scan0145 | |
| Inspection of 'Lappin's car' after extensive mileage, with a focus on Textolite gears and oil consumption. | 12th Dec 1935 | Box 88 \ 2 scan0146 | |
| Requesting an estimate of piston mileage and oil consumption, and investigating the cause of plug fouling. | 13th Nov 1935 | Box 88 \ 2 scan0147 | |
| Request to rebuild a B-7 unit from Lappin's car for use as a spare small bore test bed unit. | 3rd Jan 1935 | Box 88 \ 2 scan0148 | |
| Secret memo detailing the planned public announcement and demonstration of the Big Bore Bentley. | 29th Jan 1936 | Box 88 \ 2 scan0149 | |
| The need for a standard performance car and converting a demonstration model for testing. | 31th Jan 1936 | Box 88 \ 2 scan0150 | |
| Typed letter regarding the availability of a 'Big Bore Bentley' for demonstration runs to boost sales. | 31th Jan 1936 | Box 88 \ 2 scan0151 | |
| Correspondence regarding the testing and installation of the first production 'Big Bore Bentley' unit. | 3rd Feb 1936 | Box 88 \ 2 scan0152 | |
| Bentley accident, correspondence with Jack Barclay, and a temporary fix for the bumpers. | 13th Feb 1936 | Box 88 \ 2 scan0153 | |
| Letter from A.F. Sidgreaves to J.D. Barclay discussing the cause of an accident following an investigation. | 13th Feb 1936 | Box 88 \ 2 scan0154 | |
| Cover note for conference minutes regarding an accident investigation for 4-B-1V. | 18th Feb 1936 | Box 88 \ 2 scan0155 | |
| Analysis of a Bentley axle failure and its potential causes. | 21th Feb 1936 | Box 88 \ 2 scan0156 | |
| Broken 'U' clip found at the scene of an accident involving Chassis No. 4.B.IV. | 21th Feb 1936 | Box 88 \ 2 scan0157 | |
| Inquiry about the repairability of Chassis No. 4.B.4 and a proposal to fit it with an experimental Silentbloc body. | 24th Feb 1936 | Box 88 \ 2 scan0158 | |
| Urgently chasing the delivery status of a new 4¼ litre Bentley Trials Car, B-83-FC. | 26th Feb 1936 | Box 88 \ 2 scan0159 | |
| Weight and speedometer test results for a 4 1/4 Litre Bentley Trials Car. | 26th Feb 1936 | Box 88 \ 2 scan0160 | |
| The brake work carried out on chassis No.4BLV prior to an accident. | 27th Feb 1936 | Box 88 \ 2 scan0161 | |
| Rectifications and observations on an experimental chassis, with a focus on brake performance. | 27th Feb 1936 | Box 88 \ 2 scan0162 | |
| Private memo requesting a report on work carried out on vehicle 4-B-IV prior to a mishap on the Watford Byepass. | 27th Feb 1936 | Box 88 \ 2 scan0163 | |
| Bentley accident, attributing it to out-of-date and condemned parts. | 28th Feb 1936 | Box 88 \ 2 scan0164 | |
| Repair of chassis 4-B-IV, the disposal of its body, and considerations for all-steel body construction. | 2nd Mar 1936 | Box 88 \ 2 scan0165 | |
| Investigation into an axle failure on chassis 4-B-IV, linking it to brake jaggers and historical issues on other models. | 2nd Mar 1936 | Box 88 \ 2 scan0166 | |
| Analysis of a disastrous 'jagger' failure on a 4-B-IV vehicle, investigating causes and proposing improvements. | 2nd Mar 1936 | Box 88 \ 2 scan0167 | |
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