| Description | Date | Identifier | |
| Letter from the Experimental Department discussing the design and necessity of a stabilising bumper bar. | 25th Jan 1935 | Box 89 \ 1 scan0132 | |
| Follow-up letter regarding trying a car in its finished state after collection. | 25th Jan 1935 | Box 89 \ 1 scan0133 | |
| Letter reporting a recurring fault where the dynamo voltage regulator smells when hot. | 25th Jan 1935 | Box 89 \ 1 scan0134 | |
| Requesting an adjustment to the bonnet and near side wing. | 7th Feb 1935 | Box 89 \ 1 scan0135 | |
| Letter from Richard Summers to W. A. Robotham regarding a Bentley with pinking and consumption issues. | 7th Feb 1935 | Box 89 \ 1 scan0136 | |
| Letter from a customer reporting an intermittent but loud noise from their car's back axle. | 8th Feb 1935 | Box 89 \ 1 scan0137 | |
| Letter to W.A. Robotham discussing a back axle issue, possibly caused by cold oil. | 8th Feb 1935 | Box 89 \ 1 scan0138 | |
| Correspondence regarding a customer's complaint about wing movement on a new Bentley and the proposed solution. | 12th Feb 1935 | Box 89 \ 1 scan0139 | |
| Customer's complaint about wing movement and the proposed solution. | 13th Feb 1935 | Box 89 \ 1 scan0140 | |
| Dispatch request for a Special Voltage Regulator for chassis B-169-CW, to be sent to Lillie Hall. | 14th Feb 1935 | Box 89 \ 1 scan0141 | |
| Customer Mr. Summers' car, addressing complaints of pinking, consumption, and smelling. | 14th Feb 1935 | Box 89 \ 1 scan0142 | |
| Internal request for a report on a car trial following a customer complaint. | 14th Feb 1935 | Box 89 \ 1 scan0143 | |
| The testing of chassis B-169-CW, including feedback on the bumper bar and a faulty voltage regulator. | 15th Feb 1935 | Box 89 \ 1 scan0144 | |
| Query regarding a special voltage regulator for chassis B.169.CW and how to resolve complaints of pinking and consumption. | 15th Feb 1935 | Box 89 \ 1 scan0145 | |
| Replacement of a voltage regulator for chassis B.169.GW. | 19th Feb 1935 | Box 89 \ 1 scan0146 | |
| List of faults reported by Mr. Richard Summers for chassis B-169-CW. | 26th Feb 1935 | Box 89 \ 1 scan0147 | |
| Customer complaint letter to Bentley Motors comparing the performance of a 1935 3½ Litre Bentley unfavorably with a 1934 model. | 8th Mar 1935 | Box 89 \ 1 scan0148 | |
| Page 2 of a customer complaint letter regarding car performance and heavy steering. | 14th Mar 1935 | Box 89 \ 1 scan0149 | |
| Customer complaint case, discussing engine modifications and requesting a cost estimate. | 14th Mar 1935 | Box 89 \ 1 scan0150 | |
| Reply to a customer about the weight and performance of his Bentley car, No. B-169-CW. | 14th Mar 1935 | Box 89 \ 1 scan0151 | |
| Letter discussing vehicle alterations, fuel requirements, and a steering investigation at the Derby Works. | 9th Mar 1935 | Box 89 \ 1 scan0152 | |
| Complaint letter to W. A. Robotham regarding car issues including steering, tyre pressure, and fuel consumption. | 9th Mar 1935 | Box 89 \ 1 scan0153 | |
| Letter discussing piston failures in the No. 6 cylinder, wind noise, and delays in squash court construction. | 8th Mar 1935 | Box 89 \ 1 scan0154 | |
| Customer complaint letter to Bentley Motors regarding the performance of a 3 1/2 Litre car. | 8th Mar 1935 | Box 89 \ 1 scan0155 | |
| Customer complaint letter regarding inferior performance, heavy steering, and a missing inspection lamp for a new car. | 19th Mar 1935 | Box 89 \ 1 scan0156 | |
| Letter to Messrs. John Summers & Sons Ltd. regarding piston failures and a squash court. | 19th Mar 1935 | Box 89 \ 1 scan0157 | |
| Costs and logistics for fitting a new cylinder head and pistons to a customer's car, chassis B-169-CW. | 19th Mar 1935 | Box 89 \ 1 scan0158 | |
| Investigating making the distributor more waterproof and the issue of snow entering the bonnet. | 21th Mar 1935 | Box 89 \ 1 scan0159 | |
| The requirement for a new set of push rods for Mr. R. Summers' car, chassis B-169-CW. | 21th Mar 1935 | Box 89 \ 1 scan0160 | |
| Letter requesting drawings and information regarding hydraulic shock absorbers on a Bentley. | 23th May 1935 | Box 89 \ 1 scan0161 | |
| Letter to a customer providing shock absorber adjustment information and load limits. | 25th May 1935 | Box 89 \ 1 scan0162 | |
| Letter regarding the adjustment of Bentley shock absorbers and ride comfort. | 30th May 1935 | Box 89 \ 1 scan0163 | |
| Letter to Geoffrey Summers comparing his car's dampers with a newer, latest hand control type. | 6th Jun 1935 | Box 89 \ 1 scan0164 | |
| Letter to Bentley Motors listing faults and required repairs for car No. 169.GW. | 16th Jul 1935 | Box 89 \ 1 scan0165 | |
| Letter discussing the decision to fit a high-compression head and addressing the issue of engine pinking. | 2nd Oct 1935 | Box 89 \ 1 scan0166 | |
| Letter from the Experimental Department to a customer regarding car detonation and modifications. | 2nd Oct 1935 | Box 89 \ 1 scan0167 | |
| Curing excessive engine detonations on chassis B-169-CW. | 16th Oct 1935 | Box 89 \ 1 scan0168 | |
| Letter discussing engine detonation issues, fuel octane ratings, and ignition timing for a Bentley. | 8th Nov 1935 | Box 89 \ 1 scan0169 | |
| Letter discussing the advantages and value of high octane fuels, comparing different octane number increases. | 13th Nov 1935 | Box 89 \ 1 scan0170 | |
| Graph showing the relationship between compression ratio and octane number for various engines. | 28th Nov 1935 | Box 89 \ 1 scan0171 | |
| Letter from the Experimental Department detailing the octane numbers of two fuel samples. | 28th Nov 1935 | Box 89 \ 1 scan0172 | |
| Letter to a customer regarding engine detonation trouble and sending a new ignition governor. | 3rd Jan 1936 | Box 89 \ 1 scan0173 | |
| Letter of complaint and suggestion regarding a car's performance in wet weather and waterproofing of ignition components. | 3rd Apr 1936 | Box 89 \ 1 scan0174 | |
| Continuation of a letter with feedback on car maintenance, a sarcastic remark about the Monte Carlo Rally, and an invitation. | 3rd Apr 1936 | Box 89 \ 1 scan0175 | |
| Letter responding to criticisms about a Bentley, with mentions of a Phantom III and a race at Le Mans. | 6th Apr 1936 | Box 89 \ 1 scan0176 | |
| Letter discussing Jaguar performance, a delayed order with potential engine upgrades, and a request to expedite a chassis. | 10th Apr 1936 | Box 89 \ 1 scan0177 | |
| Letter from 'Richard' to W.A. Robotham discussing vehicle testing, a railway, and a large hole. | 10th Apr 1936 | Box 89 \ 1 scan0178 | |
| Relaying customer feedback from Mr. R. F. Summers on the performance of two 4 1/4-litre cars. | 16th Apr 1936 | Box 89 \ 1 scan0179 | |
| Letter discussing engine performance, a loan of a Jaguar, and the upcoming Phantom III model. | 17th Apr 1936 | Box 89 \ 1 scan0180 | |
| Issues with braking performance, Bentley suspension, and engine rumble. | 18th Apr 1936 | Box 89 \ 1 scan0181 | |
| Conflicting opinions on front wheel braking performance and distribution. | 21th Apr 1936 | Box 89 \ 1 scan0182 | |
| Letter to R. Summers postponing the collection of a Jaguar due to a visit from an engineer from America. | 30th May 1936 | Box 89 \ 1 scan0183 | |
| Customer complaint regarding an irksome tinkling engine noise in chassis B.58-GA, appearing at around 1500 r.p.m. | 28th May 1936 | Box 89 \ 1 scan0184 | |
| Letter arranging a social visit to test the springing of a Phantom Three car. | 3rd Jun 1936 | Box 89 \ 1 scan0185 | |
| Typed memo regarding an investigation for Mr. R. Summers' chassis B-58-GA. | 4th Jun 1936 | Box 89 \ 1 scan0186 | |
| Letter regarding the difficulty in arranging a time to collect a Jaguar. | 16th Jun 1936 | Box 89 \ 1 scan0187 | |
| Letter to R. Summers regarding the return of his Jaguar car after technical evaluation and comparison. | 30th Jun 1936 | Box 89 \ 1 scan0188 | |
| Complaint case from R. F. Summers for chassis B-58-GA. | 30th Jun 1936 | Box 89 \ 1 scan0189 | |
| Customer complaint for chassis B-58-GA owned by Mr. R.F. Summers. | 10th Jul 1936 | Box 89 \ 1 scan0190 | |
| Following up on a complaint case regarding engine noise for chassis B.58-GA. | 28th Jul 1936 | Box 89 \ 1 scan0191 | |
| Follow-up memo concerning the repair of bent push rods on Mr. Summers' car. | 29th Jul 1936 | Box 89 \ 1 scan0192 | |
| Letter of complaint regarding persistent engine noise in the valve gear and dissatisfaction with the repair process. | 29th Jul 1936 | Box 89 \ 1 scan0193 | |
| Letter of complaint from customer Mr. R. F. Summers to Bentley Motors regarding his Bentley's suspension, brakes, and tyre life. | 25th Jul 1936 | Box 89 \ 1 scan0194 | |
| Response letter to a customer regarding performance issues with a 4 1/4 litre Bentley, specifically concerning suspension, brakes, and tyres. | 28th Jul 1936 | Box 89 \ 1 scan0195 | |
| Letter from Bentley Motors defending their suspension and steering layout against competitors with independent suspension. | 29th Jul 1936 | Box 89 \ 1 scan0196 | |
| Letter to Bentley Motors giving feedback on the springing, steering, and braking of car model B 58 - GA. | 29th Jul 1936 | Box 89 \ 1 scan0197 | |
| Customer letter providing feedback on vehicle comfort and comparing it to American cars. | 29th Jul 1936 | Box 89 \ 1 scan0198 | |
| Letter to a customer discussing a persistent valve gear noise and arranging a visit. | 30th Jul 1936 | Box 89 \ 1 scan0199 | |
| Letter discussing insufficient shock absorber damping and a request for confidential modification instructions. | 19th Aug 1936 | Box 89 \ 1 scan0200 | |
| Letter responding to a query about shock absorber loads and damping on a Bentley. | 20th Aug 1936 | Box 89 \ 1 scan0201 | |
| The despatch of an over riding control valve to Messrs. John Summers & Sons Ltd. | 24th Aug 1936 | Box 89 \ 1 scan0202 | |
| Instructions for fitting a new 'over-riding control valve unit' to a Bentley chassis. | 8th Oct 1936 | Box 89 \ 1 scan0203 | |
| Letter from John Summers & Sons, Ltd. proposing a meeting at the Motor Show and discussing vehicle performance. | 8th Oct 1936 | Box 89 \ 1 scan0204 | |
| Letter from the Experimental Department regarding an upcoming show, the Ulster Bentley, and the Phantom III. | 9th Oct 1936 | Box 89 \ 1 scan0205 | |
| Letter from John Summers & Sons to W. A. Robotham discussing car models, depreciation, and arranging a meeting. | 10th Oct 1936 | Box 89 \ 1 scan0206 | |
| Letter to R. Summers about a test drive of a Bentley fitted with independent front wheel suspension by Mr. Gordon Armstrong. | 13th Oct 1936 | Box 89 \ 1 scan0207 | |
| Letter from the Experimental Department to John Summers & Sons Ltd. regarding a new lightweight car body by Van Vooren. | 28th Oct 1936 | Box 89 \ 1 scan0208 | |
| Letter from John Summers & Sons to W. A. Robotham discussing car comparisons and the Olympia motor show. | 14th Oct 1936 | Box 89 \ 1 scan0209 | |
| Letter discussing car body design, focusing on the French body, wings, centre post, and springing comfort compared to a Bentley. | 4th Nov 1936 | Box 89 \ 1 scan0210 | |
| Letter of complaint regarding the comfort and springing of a Bentley. | 18th Nov 1936 | Box 89 \ 1 scan0211 | |
| Congratulatory letter also offering advice on car comfort and customer satisfaction. | 18th Nov 1936 | Box 89 \ 1 scan0212 | |
| Customer's complaint about his car's springing and the potential for fitting independent suspension to a Bentley. | 27th Nov 1936 | Box 89 \ 1 scan0213 | |
| Customer's complaint about the car's springing and hardness at medium speeds. | 26th Nov 1936 | Box 89 \ 1 scan0214 | |
| Letter discussing car suspension issues and suggesting a test drive. | 4th Dec 1936 | Box 89 \ 1 scan0215 | |
| Letter to a customer about potential improvements to their car's suspension for better comfort. | 1st Dec 1936 | Box 89 \ 1 scan0216 | |
| Letter to Bentley Motors clarifying feedback on a car's ride comfort and springing compared to a Hillman 80. | 4th Dec 1936 | Box 89 \ 1 scan0217 | |
| Letter of complaint to W. M. Cowen regarding the standard of comfort in Bentley cars. | 4th Dec 1936 | Box 89 \ 1 scan0218 | |
| Letter from Richard of John Summers & Sons arranging a visit to Derby. | 1st Jan 1937 | Box 89 \ 1 scan0219 | |
| Letter from a client regarding car performance, issues with a 'tinkling noise', and comparisons to other vehicles. | 13th Feb 1937 | Box 89 \ 1 scan0220 | |
| Letter comparing road reports of a 20 HP Rolls Royce and a 6-cylinder Packard, focusing on weight and price. | 13th Feb 1937 | Box 89 \ 1 scan0221 | |
| Letter from John Summers & Sons, Ltd to W. A. Robotham arranging a visit to the Derby Works. | 16th Feb 1937 | Box 89 \ 1 scan0222 | |
| A potential customer who owns a Bentley, and whether to offer a test drive in a Phantom III. | 2nd Dec 1937 | Box 89 \ 1 scan0223 | |
| Potential customer's opinion on the size of the Phantom III car after a test drive. | 3rd Dec 1937 | Box 89 \ 1 scan0224 | |
| Letter regarding sending a Christmas present, asking for an address, and commenting on motor cars. | 18th Dec 1937 | Box 89 \ 1 scan0225 | |
| Letter to Geoffrey Summers providing an address and discussing a future visit to try motors. | 16th Dec 1937 | Box 89 \ 1 scan0226 | |
| Two failures on a loaned Phantom III Trials Car and requesting information for a reply to the customer, Mr. Summers. | 3rd Jan 1938 | Box 89 \ 1 scan0227 | |
| The repair of a dynamo fuse and riding control on a Trials Car. | 5th Jan 1938 | Box 89 \ 1 scan0228 | |
| Fracture of a fibre pad on the low tension rocker arm, its potential causes, and proposed design modifications. | 6th Jan 1938 | Box 89 \ 1 scan0229 | |
| Customer complaints from Mr. Richard F. Summers regarding a loaned car and the actions being taken. | 6th Jan 1938 | Box 89 \ 1 scan0230 | |
| Customer's feedback letter giving their impressions of a Phantom III and comparing it to a Bentley. | 4th Jan 1938 | Box 89 \ 1 scan0231 | |
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