| Description | Date | Identifier | |
| Mr. Geoffrey Smith's car regarding bad oil consumption and the options for its lead bronze bearings. | 10th Dec 1935 | Box 90 \ 2 scan0061 | |
| Letter to Mr. Geoffrey Smith arranging a convenient time for experimental work to be carried out on his car. | 12th Dec 1935 | Box 90 \ 2 scan0062 | |
| Letter from Iliffe & Sons Ltd. to Mr. Robotham regarding work carried out on a Bentley and arrangements for its collection. | 18th Dec 1935 | Box 90 \ 2 scan0063 | |
| Letter to Mr. Geoffrey Smith regarding delays in road testing his car due to bad weather. | 20th Dec 1935 | Box 90 \ 2 scan0064 | |
| Letter concerning the delayed collection of a Bentley due to dangerous road conditions and alternative travel arrangements. | 23th Dec 1935 | Box 90 \ 2 scan0065 | |
| Letter confirming arrangements for the delivery of a Bentley car to Mr. Geoffrey Smith. | 23th Dec 1935 | Box 90 \ 2 scan0066 | |
| Work to rectify excessive oil consumption on car B-110DG, with comparative test results. | 2nd Jan 1936 | Box 90 \ 2 scan0067 | |
| Covering note regarding a letter received from the Managing Editor of 'Autocar'. | 22th Mar 1937 | Box 90 \ 2 scan0068 | |
| Copy of a letter to Bentley Motors requesting the fitting of bigger tyres to a car for experimental purposes. | 19th Mar 1937 | Box 90 \ 2 scan0069 | |
| Feasibility and implications of fitting larger tyres to Mr. Geoffrey Smith's Bentley. | 23th Mar 1937 | Box 90 \ 2 scan0070 | |
| Questioning the benefit of fitting larger tyres to Mr. Geoffrey Smith's Bentley and inquiring about alternatives. | 24th Mar 1937 | Box 90 \ 2 scan0071 | |
| The trade-offs of fitting larger tyres to a Bentley, considering ride comfort versus handling and steering. | 25th Mar 1937 | Box 90 \ 2 scan0072 | |
| Analysis of a broken piston from chassis B.100-GA, discussing material composition and potential improvements. | 24th May 1937 | Box 90 \ 2 scan0073 | |
| Report discussing a piston failure in Mr. Geoffrey Smith's car, linking it to driving habits and temperature effects. | 24th May 1937 | Box 90 \ 2 scan0074 | |
| Investigating the failure of pistons on Geoffrey Smith's car, proposing material changes and further testing. | 26th May 1937 | Box 90 \ 2 scan0075 | |
| Scrapped pistons and the recommendation for future engine bed testing. | 26th May 1937 | Box 90 \ 2 scan0076 | |
| Arrangements for Mr. Geoffrey Smith's visit to the works concerning his chassis, B.137-KU. | 21th Jul 1937 | Box 90 \ 2 scan0077 | |
| Invitation to Geoffrey Smith of Messrs. Iliffe & Sons Ltd. to visit the Derby factory to discuss a new chassis on test. | 23th Jul 1937 | Box 90 \ 2 scan0078 | |
| Letter from Iliffe & Sons Ltd. arranging a suitable date for a visit to Derby. | 26th Jul 1937 | Box 90 \ 2 scan0079 | |
| Letter to Geoffrey Smith regarding the scheduling of a visit in August. | 28th Jul 1937 | Box 90 \ 2 scan0080 | |
| Letter from Iliffe & Sons Ltd. to W. A. Robotham regarding the arrangement of a meeting. | 11th Aug 1937 | Box 90 \ 2 scan0081 | |
| Telephone message from Mr. Geoffrey Smith of 'Autocar' to reschedule a visit. | 11th Aug 1937 | Box 90 \ 2 scan0082 | |
| Letter to Geoffrey Smith of The Autocar magazine confirming arrangements for a visit to the Works. | 13th Aug 1937 | Box 90 \ 2 scan0083 | |
| Letter from S. Smith & Sons regarding the dial schemes for Mr. Geoffrey Smith's Bentley. | 24th Mar 1938 | Box 90 \ 2 scan0084 | |
| Letter from The Autocar magazine requesting data on brake gear weight, transmission loss and weight distribution for a paper. | 3rd Jun 1938 | Box 90 \ 2 scan0085 | |
| Letter from the Managing Editor of 'THE AUTOCAR' requesting data on over and under steering tests. | 3rd Jun 1938 | Box 90 \ 2 scan0086 | |
| Letter to Geoffrey Smith of Messrs. Iliffe & Sons Ltd. acknowledging his letter and promising a follow-up note. | 8th Jun 1938 | Box 90 \ 2 scan0087 | |
| Letter to 'The Autocar' magazine comparing the weight of American and British cars. | 16th Jun 1938 | Box 90 \ 2 scan0088 | |
| Comparison of English and American car manufacturing specifications and weight-saving measures. | 14th Jun 1938 | Box 90 \ 2 scan0089 | |
| Comparison of American and British motor-car design, focusing on steering, streamlining, and engine technology. | 14th Jun 1938 | Box 90 \ 2 scan0090 | |
| Comparing vehicle design philosophies, including weight, transmission loss, weight distribution, and handling characteristics. | 14th Jun 1938 | Box 90 \ 2 scan0091 | |
| Letter from the Managing Editor of The Autocar magazine to W. A. Robotham regarding data for a paper for the I.A.E. | 23th Jun 1938 | Box 90 \ 2 scan0092 | |
| Letter from The Autocar magazine requesting comments on a paper about the Modern Car. | 28th Sep 1938 | Box 90 \ 2 scan0093 | |
| Letter responding to a paper, querying the practicality of car air-conditioning and full-flow oil filters. | 4th Oct 1938 | Box 90 \ 2 scan0094 | |
| Letter to G. Smith, Esq. discussing the effectiveness of by-pass oil filters and critiquing recent technical articles. | 4th Oct 1938 | Box 90 \ 2 scan0095 | |
| Letter from the Managing Editor of 'The Autocar' magazine to W. A. Rowbotham. | 21th Oct 1938 | Box 90 \ 2 scan0096 | |
| Letter from Iliffe & Sons Ltd. regarding the dispatch of a new journal, 'AIRCRAFT PRODUCTION'. | 25th Oct 1938 | Box 90 \ 2 scan0097 | |
| Letter from The Autocar magazine discussing air-conditioning and oil filters. | 26th Oct 1938 | Box 90 \ 2 scan0098 | |
| Letter from the Managing Editor of The Autocar to W. A. Robotham regarding filters and technical articles. | 26th Oct 1938 | Box 90 \ 2 scan0099 | |
| List of vehicle faults and issues to be addressed. | 29th Oct 1938 | Box 90 \ 2 scan0100 | |
| Letter to the Managing Editor of 'The Autocar' magazine regarding a technically inaccurate article on crankshafts. | 29th Oct 1938 | Box 90 \ 2 scan0101 | |
| Page two of a letter to Geoffrey Smith, Esq. regarding by-pass filters and engine cleaning. | 29th Oct 1938 | Box 90 \ 2 scan0102 | |
| Letter from 'The Autocar' magazine discussing reader contributions and a scheduling conflict for a paper reading. | 3rd Nov 1938 | Box 90 \ 2 scan0103 | |
| Letter from the Managing Editor of The Autocar magazine to W. A. Robotham. | 3rd Nov 1938 | Box 90 \ 2 scan0104 | |
| Letter from The Autocar magazine enquiring about a Cambridge electric recording machine for road tests. | 29th Jun 1939 | Box 90 \ 2 scan0105 | |
| Letter to the Managing Editor of 'The Autocar' discussing the use of a chronograph for performance testing. | 30th Jun 1939 | Box 90 \ 2 scan0106 | |
| Letter from 'The Autocar' magazine discussing arrangements for vehicle testing and a potential article. | 4th Jul 1939 | Box 90 \ 2 scan0107 | |
| Letter to Geoffrey Smith of 'The Autocar' regarding a trip to the Dolomites and the availability of a Bentley for testing. | 11th Jul 1939 | Box 90 \ 2 scan0108 | |
| Letter from Iliffe & Sons Ltd. to W.A. Robotham regarding a trip to test a new Bentley on the Continent. | 13th Jul 1939 | Box 90 \ 2 scan0109 | |
| Letter from Iliffe & Sons Ltd. to W. A. Robotham enquiring about the 'Hotel du Cap' and passing on a message. | 13th Jul 1939 | Box 90 \ 2 scan0110 | |
| Letter to Geoffrey Smith regarding the availability and testing of the new Bentley. | 14th Jul 1939 | Box 90 \ 2 scan0111 | |
| Letter from Geoffrey Smith of Iliffe & Sons Ltd. to W.A. Robotham regarding scheduling, travel, and car collection arrangements. | 18th Jul 1939 | Box 90 \ 2 scan0112 | |
| Secret memorandum concerning the provision of a Bentley V car for a continental trial by Geoffrey Smith. | 19th Jul 1939 | Box 90 \ 2 scan0113 | |
| Secret memo regarding a car for Mr. Geoffrey Smith. | 22th Jul 1939 | Box 90 \ 2 scan0114 | |
| Secret memo concerning the cancellation of a trial for Geoffrey Smith on the Continent. | 27th Jul 1939 | Box 90 \ 2 scan0115 | |
| Inviting colleagues to a lunch meeting with a Bentley enthusiast, Professor Dodds, who is trying a new chassis. | 24th Feb 1936 | Box 90 \ 2 scan0116 | |
| Damaged clutch driven plate on Professor Dodds' car, caused by a metal splinter during gearbox assembly. | 12th May 1936 | Box 90 \ 2 scan0117 | |
| Professor Dodds' feedback on his new all-steel body 3 1/2-litre Bentley. | 29th Jun 1936 | Box 90 \ 2 scan0118 | |
| Engine problems with Ethyl fuel in 3½ and 4¼ litre Bentley cars. | 1st Jul 1936 | Box 90 \ 2 scan0119 | |
| Investigation into faulty spark plugs and the use of Ethyl fuel in Bentley cars. | 9th Jul 1936 | Box 90 \ 2 scan0120 | |
| Engine missing issues and service arrangements for Professor Dodds' Bentley car. | 22th Jul 1936 | Box 90 \ 2 scan0121 | |
| Investigating a complaint from Professor Dodds regarding his Bentley car and its spark plugs. | 28th Jul 1936 | Box 90 \ 2 scan0122 | |
| Required return date of Professor Dodds' car to Park Wards. | 30th Jul 1936 | Box 90 \ 2 scan0123 | |
| Providing contact details for a driver to be notified upon completion of car repairs. | 30th Jul 1936 | Box 90 \ 2 scan0124 | |
| Confirming arrangements to have a car at Park Wards for Professor Dodds. | 31th Jul 1936 | Box 90 \ 2 scan0125 | |
| Typed memo with a handwritten note regarding the delivery of a car for Professor Dodds. | 1st Aug 1936 | Box 90 \ 2 scan0126 | |
| Misfire on a Bentley, suggesting reversing coil polarity and discussing non-standard spark plug issues. | 16th Sep 1936 | Box 90 \ 2 scan0127 | |
| Persistent engine missing problems on Professor Dodds' car, B-34-GA. | 18th Sep 1936 | Box 90 \ 2 scan0128 | |
| Performance and longevity of A.C. and Champion spark plugs. | 18th Sep 1936 | Box 90 \ 2 scan0129 | |
| Unit in Professor Dodds' car for reproducing sparking plug troubles. | 21th Sep 1936 | Box 90 \ 2 scan0130 | |
| Sending AC and Champion spark plugs to Professor Dodds to test an engine 'missing' fault. | 14th Sep 1936 | Box 90 \ 2 scan0131 | |
| Professor Dodds' ongoing engine performance issues, including extracts from his letter. | 15th Sep 1936 | Box 90 \ 2 scan0132 | |
| Troubleshooting a misfire on a Bentley by reversing coil polarity and sourcing correct spark plugs. | 16th Sep 1936 | Box 90 \ 2 scan0133 | |
| Preparing and fitting an experimental unit into Professor Dodds' car, registration B-34-GA. | 22th Sep 1936 | Box 90 \ 2 scan0134 | |
| Delay in working on Professor Dodds' car and the submission of a new plug for an opinion. | 24th Sep 1936 | Box 90 \ 2 scan0135 | |
| Engine change and spark plug for Professor Dodds' car, chassis number B-34-GA. | 28th Sep 1936 | Box 90 \ 2 scan0136 | |
| Telegram received by telephone regarding a car being hopeless and requiring an engine change. | 29th Sep 1936 | Box 90 \ 2 scan0137 | |
| Replacement of the engine block, cylinder head, wiring, and distributor on Professor Dodds' car with parts from a Bentley I. | 29th Sep 1936 | Box 90 \ 2 scan0138 | |
| The arrangement of a loaner car, B-34-GA, for Professor Dodds. | 29th Sep 1936 | Box 90 \ 2 scan0139 | |
| Internal memorandum regarding the investigation of misfiring issues on Professor Dodds' car, chassis B-34-GA. | 1st Oct 1936 | Box 90 \ 2 scan0140 | |
| Arrangement for Professor Dodds' car. | 6th Oct 1935 | Box 90 \ 2 scan0141 | |
| Letter to Professor Dodds regarding the despatch of Champion Sparking Plugs and the return of faulty A.C. plugs. | 15th Oct 1936 | Box 90 \ 2 scan0142 | |
| Request to despatch 6 Champion LB-10 sparking plugs for a Bentley Chassis as a free-of-charge replacement. | 15th Oct 1936 | Box 90 \ 2 scan0143 | |
| Investigating a misfiring complaint on Professor Dodds' Bentley, chassis B-34-GA, which was traced to a faulty petrol pump. | 15th Oct 1936 | Box 90 \ 2 scan0144 | |
| Vehicle performance, engine misfires, and recommended sparking plugs for a Bentley. | 15th Oct 1936 | Box 90 \ 2 scan0145 | |
| Diagnosing intermittent misfiring and pump failure on a 4 1/4-litre chassis. | 16th Oct 1936 | Box 90 \ 2 scan0146 | |
| Fitting a pump unit to an early 4 1/4 litre car and issues with A.C. plugs for Professor Dodd. | 19th Oct 1936 | Box 90 \ 2 scan0147 | |
| Request for the return of pump units from Professor Dodds' car for diaphragm examination. | 19th Oct 1936 | Box 90 \ 2 scan0148 | |
| The supply and testing of a first production batch of ceramic plugs from K.L.G. for Professor Dodds. | 18th Dec 1936 | Box 90 \ 2 scan0149 | |
| Feedback from Professor Dodds regarding spark plugs and arranging for a new ceramic set. | 16th Dec 1936 | Box 90 \ 2 scan0150 | |
| Letter from Professor E.C. Dodds to Messrs. Bentley Ltd. regarding persistent issues with spark plugs. | 14th Dec 1936 | Box 90 \ 2 scan0151 | |
| Letter discussing the poor performance of Champion sparking plugs in a Bentley, returning them for examination and mentioning older K.L.G. plugs. | 1st Jan 1937 | Box 90 \ 2 scan0152 | |
| Car B.34-GA for Professor Dodds, received by the Experimental Dept, seeking details of work and charges. | 4th Jan 1937 | Box 90 \ 2 scan0153 | |
| Confirming no charge for car B-34-GA belonging to Professor Dodds, as it was only tested for misfires. | 7th Jan 1937 | Box 90 \ 2 scan0154 | |
| Professor Dodds' positive experience with Discol fuel, which resolved engine missing and knocking. | 1st Feb 1937 | Box 90 \ 2 scan0155 | |
| Customer's complaint about engine knocking and delegating the issue. | 2nd Jun 1937 | Box 90 \ 2 scan0156 | |
| Engine knocking issues on Professor Dodds' car after decarbonisation. | 20th May 1937 | Box 90 \ 2 scan0157 | |
| Technical memo regarding a complaint of erratic pinking on a 4¼-litre chassis, identified as being caused by sooted spark plugs. | 21th May 1937 | Box 90 \ 2 scan0158 | |
| Letter from a customer detailing persistent engine knocking and missing issues with their car. | 1st Jun 1937 | Box 90 \ 2 scan0159 | |
| Page 2 of a letter from E.C. Dodds describing an engine knocking sound that disappears when hot. | 9th Jun 1937 | Box 90 \ 2 scan0160 | |
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