| Description | Date | Identifier | |
| Test report on a sealed petrol filler air vent for Phantom II & 20/25 HP models, detailing issues with petrol loss. | 24th Feb 1934 | Box 106 \ 2 scan0136 | |
| Inquiry about the status of chassis modifications, specifically a sealed filler with a separate vent, for the next series of cars. | 5th Mar 1934 | Box 106 \ 2 scan0137 | |
| The testing and successful modification of a sealed petrol filler air vent to prevent fuel surge on the Phantom II & 20/25 HP models. | 6th Mar 1934 | Box 106 \ 2 scan0138 | |
| Modifications to the Phantom II and 20/25 sealed petrol filler air vent to prevent fuel escape. | 7th Mar 1934 | Box 106 \ 2 scan0139 | |
| Modifications to the petrol filler air vent on Phantom II and 20/25 models. | 7th Mar 1934 | Box 106 \ 2 scan0140 | |
| Modifications to the Sealed Petrol Filler Air Vent for the Phantom II and 20/25 HP models. | 14th Mar 1934 | Box 106 \ 2 scan0141 | |
| 10,000-mile testing of a new petrol tank air vent scheme for 20/25 HP and 40/50 models. | 24th Mar 1934 | Box 106 \ 2 scan0142 | |
| Standardisation of a petrol tank sealed filler air vent. | 7th Mar 1934 | Box 106 \ 2 scan0143 | |
| Successful anti-surge tower adaptation for the 20/25 HP petrol tank with an external filler. | 7th Mar 1934 | Box 106 \ 2 scan0144 | |
| Query regarding the production timeline for a permanent modification to the sealed petrol filler air vent for the Phantom II and 20/25 models. | 12th Mar 1934 | Box 106 \ 2 scan0145 | |
| Standardisation of parts for modifications to the petrol tank to suit a concealed luggage grid. | 27th Apr 1934 | Box 106 \ 2 scan0146 | |
| Estimated cost for extra jigs, tools, and equipment, and a note on production for the 'F' series chassis. | 24th May 1934 | Box 106 \ 2 scan0147 | |
| The design of a petrol tank unit float baffle for 20/25 HP cars. | 11th Apr 1935 | Box 106 \ 2 scan0148 | |
| Drawing LeC.4463 for a 25 HP anti-surge baffle in a petrol tank. | 13th Apr 1935 | Box 106 \ 2 scan0149 | |
| Special fitting for a 20/25 HP chassis petrol tank. | 24th Apr 1935 | Box 106 \ 2 scan0150 | |
| Specification for the petrol system of the 21-G-IV model, including parts list and instructions. | 25th Apr 1935 | Box 106 \ 2 scan0151 | |
| Petrol tank air vent on the 20/25 HP Chassis, suggesting the use of a Banjo connection. | 1st May 1935 | Box 106 \ 2 scan0152 | |
| The 25-29 Petrol System, referencing drawings for the petrol filter and its mounting. | 30th Nov 1935 | Box 106 \ 2 scan0153 | |
| Proposal to replace a cast petrol filler with a fabricated sheet metal version for cost and weight savings on the 20/25 HP and Phantom III models. | 19th Dec 1935 | Box 106 \ 2 scan0154 | |
| Cost reductions via a new welded petrol filler for the 25/30 HP car and its potential use on other models. | 14th Jan 1936 | Box 106 \ 2 scan0155 | |
| Request for costing of component parts for the 20/25 HP petrol system, comparing standard and modified versions. | 13th Feb 1936 | Box 106 \ 2 scan0156 | |
| Comparison of present and future fuel system components for the 20/25 HP model. | 20th Feb 1936 | Box 106 \ 2 scan0157 | |
| Cost of updating the 20/25 HP chassis petrol system from an Autovac to an S.U. pump. | 20th Feb 1936 | Box 106 \ 2 scan0158 | |
| Requesting the urgent despatch of a 20/25 HP petrol tank unit for repair. | 21th Feb 1936 | Box 106 \ 2 scan0159 | |
| Letter to Messrs. Smith & Sons regarding the repair of a faulty 20/25 petrol tank unit. | 22th Feb 1936 | Box 106 \ 2 scan0160 | |
| Letter from S. Smith & Sons regarding the repair of a 20/25 HP Petrol Tank Unit. | 24th Feb 1936 | Box 106 \ 2 scan0161 | |
| Examination and potential standardisation of Superflexit petrol piping. | 13th Oct 1936 | Box 106 \ 2 scan0162 | |
| The use and temperature limitations of superflexit on aircraft. | 9th Oct 1936 | Box 106 \ 2 scan0163 | |
| The performance and use of Superflexit type flexible fuel and oil pipes. | 10th Oct 1936 | Box 106 \ 2 scan0164 | |
| Standardisation of parts for 25/30 HP Superflexit petrol piping. | 2nd Oct 1936 | Box 106 \ 2 scan0165 | |
| Stating a nil estimated cost for extra jigs, tools and equipment, indicating they were bought out. | 25th Sep 1936 | Box 106 \ 2 scan0166 | |
| Cost estimate and technical challenges of a new outside petrol filler design for the 25/30 model. | 26th Nov 1936 | Box 106 \ 2 scan0167 | |
| Letter to S. Smith & Sons regarding a faulty 25/30 HP petrol gauge tank unit being returned for examination. | 15th Jan 1937 | Box 106 \ 2 scan0168 | |
| The dispatch of a petrol tank gauge unit for examination and repair. | 15th Jan 1937 | Box 106 \ 2 scan0169 | |
| Request to fit a three-way switch for the petrol pumps on vehicle GLG-5. | 25th Dec 1936 | Box 106 \ 2 scan0170 | |
| List of S.U. petrol pumps removed from Bentley chassis during November 1938, detailing rejection reasons. | 5th Dec 1938 | Box 106 \ 2 scan0171 | |
| Summary of petrol pump complaints for 3.5 & 4.25 litre Bentley models recorded in November 1938. | 5th Dec 1938 | Box 106 \ 2 scan0172 | |
| List of S.U. petrol pumps removed from Bentley chassis during September 1938, with reasons for rejection. | 6th Sep 1938 | Box 106 \ 2 scan0173 | |
| Forwarding charts on petrol pump failures and cylinder bore wear. | 8th Jun 1938 | Box 106 \ 2 scan0174 | |
| Investigation into cracking S.U. pumps, identifying over-tightening screws as the cause. | 6th Apr 1938 | Box 106 \ 2 scan0175 | |
| The repair of petrol pumps that are out of guarantee. | 24th Feb 1938 | Box 106 \ 2 scan0176 | |
| Request from the Kingsbury Depot for their men to receive instruction at the Works. | 24th Jan 1938 | Box 106 \ 2 scan0177 | |
| Report on returned petrol pumps and arranging a site visit. | 19th Jan 1938 | Box 106 \ 2 scan0178 | |
| Visit to Kingsbury Depot to investigate failures in pumps, focusing on gummed up valves. | 1st Feb 1938 | Box 106 \ 2 scan0179 | |
| Agreement for Depots to handle out-of-guarantee petrol pumps. | 14th Dec 1937 | Box 106 \ 2 scan0180 | |
| Investigation report on a failing Bentley Petrol Pump No. RB.1330. | 23th Dec 1937 | Box 106 \ 2 scan0181 | |
| Test report table comparing performance data for an N.S. Unit and an O.S. Unit under various mechanical configurations. | 23th Dec 1937 | Box 106 \ 2 scan0182 | |
| Proposal for a third party to refit petrol pumps on a car that is out of guarantee. | 20th Dec 1937 | Box 106 \ 2 scan0183 | |
| Faulty G.5.SC. Bentley petrol pump being sent for examination. | 12th Nov 1937 | Box 106 \ 2 scan0184 | |
| Faults found on a dismantled Bentley petrol pump. | 8th Sep 1937 | Box 106 \ 2 scan0185 | |
| Requesting a Depot Sheet regarding breaking float chamber covers on early Bentley S.U. carburetters. | 25th May 1937 | Box 106 \ 2 scan0186 | |
| Petrol evaporation issues and proposing a redesign of the petrol feed pipe. | 20th Apr 1937 | Box 106 \ 2 scan0187 | |
| Order for S.U. petrol pump spare parts that were received unassembled. | 21th Oct 1937 | Box 106 \ 2 scan0188 | |
| Faults with petrol pumps and a knocking issue with Bentley driving dogs. | 14th Mar 1937 | Box 106 \ 2 scan0189 | |
| Modification to the valves on S.U. petrol pumps to resolve noise and unsteady delivery issues. | 2nd Dec 1936 | Box 106 \ 2 scan0190 | |
| New scheme for handling quarterly complaints and issues related to S.U. petrol pumps. | 11th Aug 1937 | Box 106 \ 2 scan0191 | |
| New pigeon-hole box system for filing quarterly complaints. | 2nd Aug 1937 | Box 106 \ 2 scan0192 | |
| S.U. Petrol Pumps, detailing the receipt of a tool for modifications and listing current stock levels of related parts. | 6th Aug 1937 | Box 106 \ 2 scan0193 | |
| Leaks from rivets on 3.5 and 4.25 litre Bentley petrol tanks and proposing a solution. | 2nd Feb 1937 | Box 106 \ 2 scan0194 | |
| Blueprint diagram showing an underneath view of a Bentley petrol tank with two indicated petrol leaks. | 4th Mar 1937 | Box 106 \ 2 scan0195 | |
| Bentley petrol tank failures, focusing on the use of rivets versus soldering for baffles. | 4th Mar 1937 | Box 106 \ 2 scan0196 | |
| List of S.U. petrol pumps removed from Bentley chassis in December 1936, with associated complaints. | 4th Jan 1937 | Box 106 \ 2 scan0197 | |
| Continued list of pump replacements for December 1936 with chassis details and complaint reasons. | 31th Dec 1936 | Box 106 \ 2 scan0198 | |
| Requesting information on defective petrol pumps, including failure types and return rates for various models. | 2nd Apr 1937 | Box 106 \ 2 scan0199 | |
| Internal memorandum discussing a query from S.U. Company about dismantled petrol pumps and a separate issue regarding a Bentley driving dog knock. | 19th Apr 1937 | Box 106 \ 2 scan0200 | |
| Petrol pumps, specifically communication with S.U.'s regarding mishandling by chauffeurs. | 20th Apr 1937 | Box 106 \ 2 scan0201 | |
| Instruction to apply an anodic oxidisation process to aluminium petrol filter covers to prevent corrosion. | 12th Apr 1937 | Box 106 \ 2 scan0202 | |
| Suggested design simplification for the 25/30 HP petrol pump mounting. | 11th Jan 1937 | Box 106 \ 2 scan0203 | |
| On the satisfactory performance of a special petrol pump fitted to the Paris Trial's car. | 9th Jan 1937 | Box 106 \ 2 scan0204 | |
| Delayed changeover to G-3 zinc base diaphragms for the S.U. petrol pump due to material supply issues. | 17th Sep 1936 | Box 106 \ 2 scan0205 | |
| Requesting a report on an S.U. petrol pump with a silencing washer and G-3 diaphragms. | 5th Oct 1936 | Box 106 \ 2 scan0206 | |
| Material suitability and testing for S.U. petrol pumps. | 19th Sep 1936 | Box 106 \ 2 scan0207 | |
| Confirming a telephone conversation regarding petrol pumps. | 16th Sep 1936 | Box 106 \ 2 scan0208 | |
| Material for petrol pump diaphragms and the transition to a new, improved fabric. | 16th Sep 1936 | Box 106 \ 2 scan0209 | |
| Correspondence with The S.U. Company regarding the material for petrol pump diaphragms. | 16th Sep 1936 | Box 106 \ 2 scan0210 | |
| Letter to The S.U. Company regarding the supply and specification of cotton fabric for petrol pump diaphragms. | 16th Sep 1936 | Box 106 \ 2 scan0211 | |
| Instructing S.U. to introduce their G.2. type petrol pumps. | 15th Sep 1936 | Box 106 \ 2 scan0212 | |
| Failure of petrol pump diaphragms and the introduction of a new material. | 15th Sep 1936 | Box 106 \ 2 scan0213 | |
| Letter to The S.U. Company regarding the diaphragm material for petrol pumps, cancelling a previous instruction. | 15th Sep 1936 | Box 106 \ 2 scan0214 | |
| Questioning the decision to reject material recommended by S.U. for their petrol pumps. | 14th Sep 1936 | Box 106 \ 2 scan0215 | |
| Letter to the S.U. Company regarding the material for petrol pump diaphragms, instructing them to continue using the existing material. | 14th Sep 1936 | Box 106 \ 2 scan0216 | |
| Letter to The S.U. Company Ltd. regarding the testing of aluminium washers for petrol pumps. | 11th Sep 1936 | Box 106 \ 2 scan0217 | |
| Letter to The S.U. Company regarding a change of fabric to be used in petrol pumps. | 10th Sep 1936 | Box 106 \ 2 scan0218 | |
| The causes of failures in S.U. petrol pump diaphragms following a meeting in Birmingham. | 10th Sep 1936 | Box 106 \ 2 scan0219 | |
| Report discussing diaphragm material failures and testing, and a complaint regarding noisy pumps. | 10th Sep 1936 | Box 106 \ 2 scan0220 | |
| The inspection and future improvements for pumps, including material changes and new diaphragms. | 10th Sep 1936 | Box 106 \ 2 scan0221 | |
| Letter to The S.U. Company regarding the change of fabric to be used in petrol pumps. | 10th Sep 1936 | Box 106 \ 2 scan0222 | |
| Petrol pump failures and valve differences between Bentley and Rolls-Royce chassis. | 9th Sep 1936 | Box 106 \ 2 scan0223 | |
| Ongoing failures, noise, and evaporation issues with petrol pumps and potential solutions. | 26th Aug 1936 | Box 106 \ 2 scan0224 | |
| Delayed arrival, testing, and re-fitting of a special S.U. petrol pump. | 6th Oct 1936 | Box 106 \ 2 scan0225 | |
| Simple modification to cure noisy petrol pumps. | 11th Jul 1936 | Box 106 \ 2 scan0226 | |
| Resolving issues with a noisy petrol pump, slow running, and silencer spitting on the 25/30 HP model. | 3rd Jul 1936 | Box 106 \ 2 scan0227 | |
| Outlining complaints regarding petrol pump failures on Bentley vehicles. | 28th Aug 1936 | Box 106 \ 2 scan0228 | |
| Authorisation sheet for a necessary modification to the front pivot of 'INDIA'. | 6th Mar 1925 | Box 106 \ 3 scan0001 | |
| Telegram received by telephone concerning steering pushrod lubrication issues. | 1st Apr 1925 | Box 106 \ 3 scan0002 | |
| Telegram discussing the application of a ball bearing and Ferodo damping to an axle. | 23th May 1923 | Box 106 \ 3 scan0003 | |
| The failure of an 'India' steering pivot during a bumping test, recommending a halt to all work and a design modification. | 3rd Apr 1925 | Box 106 \ 3 scan0004 | |
| Design of the 'India' model's steering column and proposing American mahogany for the instrument board. | 9th Apr 1925 | Box 106 \ 3 scan0005 | |
| Breakage of a steering pivot and proposing design improvements. | 5th Apr 1925 | Box 106 \ 3 scan0006 | |
| Secret memo detailing modifications to a pivot for the India model, including instructions from Mr. Royce. | 30th Apr 1925 | Box 106 \ 3 scan0007 | |
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