| Description | Date | Identifier | |
| The standardisation of thermometer units and radiator top tanks for the Wraith model. | 26th Apr 1938 | Box 150 \ 3 scan0442 | |
| Letter to S. Smith & Sons Ltd. requesting information on potential modifications to instrument dials. | 12th Apr 1938 | Box 150 \ 3 scan0443 | |
| Letter from S. Smith & Sons Ltd. concerning Oil Gauge and Thermometer Units. | 25th Apr 1938 | Box 150 \ 3 scan0444 | |
| Letter to Serck Radiators Ltd. regarding the potential supply of radiator matrices and arranging a works visit. | 27th Apr 1938 | Box 150 \ 3 scan0445 | |
| Letter from Serck Radiators Limited arranging an appointment with Mr. Steadman. | 28th Apr 1938 | Box 150 \ 3 scan0446 | |
| Letter from Clayton Dewandre Co. Ltd. acknowledging receipt of a paper on Automobile Cooling. | 27th Apr 1938 | Box 150 \ 3 scan0447 | |
| Letter from a supplier responding to a complaint about oversized sample washers for a filler cap. | 27th Apr 1938 | Box 150 \ 3 scan0448 | |
| Inspection report detailing variations and defects on a sample of radiator shutters supplied by John Marston Ltd. | 27th Apr 1938 | Box 150 \ 3 scan0449 | |
| Manufacturing and quality control notes regarding the assembly, polishing, and soldering of a component. | 29th Apr 1938 | Box 150 \ 3 scan0450 | |
| Letter to Avon India Rubber Co. Ltd. regarding the dispatch of three washers for testing. | 29th Apr 1938 | Box 150 \ 3 scan0451 | |
| Letter to John Marston Ltd. regarding a sample Bentley dummy shutter set and radiator parts. | 30th Apr 1938 | Box 150 \ 3 scan0452 | |
| Parts list for the Bentley 50 radiator. | 2nd May 1938 | Box 150 \ 3 scan0453 | |
| Forwarding a B.50 radiator and shell to John Marston Ltd. for use in building a new radiator. | 2nd May 1938 | Box 150 \ 3 scan0454 | |
| Performance graph plotting airflow against dissipation, horsepower, air rise, and static pressure for a test section. | 2nd May 1938 | Box 150 \ 3 scan0455 | |
| Letter from Ethyl Export Corporation sending their annual 'Brief Passenger Car Data' publication for 1939. | 6th Jan 1939 | Box 151 \ 1 scan0001 | |
| Query regarding the performance benefits of using Discoll fuel in Bentley Trials Cars and R-R cars. | 2nd Feb 1939 | Box 151 \ 1 scan0002 | |
| Use of Discol fuel in Bentley cars, its anti-detonation properties, and its disadvantages. | 3rd Feb 1939 | Box 151 \ 1 scan0003 | |
| Letter from Duckham House regarding the performance of a fuel additive called ADCOIDS and seeking approval. | 9th Mar 1939 | Box 151 \ 1 scan0004 | |
| Letter to Sir A. Duckham discussing cylinder bore wear in relation to 'adcoids' versus straight petrol. | 11th Mar 1939 | Box 151 \ 1 scan0005 | |
| Letter from Duckham House to W.A. Robotham regarding the endorsement of a lubricant additive called ADCOIDS. | 14th Mar 1939 | Box 151 \ 1 scan0006 | |
| Quoting Alexander Duckham Esq. on his car's oil and petrol consumption figures over 24,000 miles. | 15th Mar 1939 | Box 151 \ 1 scan0007 | |
| Covering letter forwarding a query about the effects of using Ethyl petrol in car engines for internal comment. | 20th Mar 1939 | Box 151 \ 1 scan0008 | |
| Customer inquiry regarding the effects of using petrol containing ETHYL in car engines. | 16th Mar 1939 | Box 151 \ 1 scan0009 | |
| Request for information on American overdrive technology, particularly from Warner, G.M., and Chrysler. | 28th Mar 1939 | Box 151 \ 1 scan0010 | |
| Requesting payment authorisation for a Bentley Motors invoice for 21 gallons of petrol. | 28th Mar 1939 | Box 151 \ 1 scan0011 | |
| Letter from Ethyl Export Corporation regarding information on overdrives and discussions with G.M. and Chrysler. | 29th Mar 1939 | Box 151 \ 1 scan0012 | |
| Requesting payment for 21 gallons of petrol supplied by Bentley Motors Ltd. | 3rd Apr 1939 | Box 151 \ 1 scan0013 | |
| Letter from customer Alexander Duckham about a product called Adcoids. | 4th May 1939 | Box 151 \ 1 scan0014 | |
| Letter from Alexander Duckham regarding the performance of his ADCOIDS additive in an engine test. | 4th May 1939 | Box 151 \ 1 scan0015 | |
| Use of upper cylinder lubricants and the cost-benefit analysis of testing a product called Adcoids. | 10th May 1939 | Box 151 \ 1 scan0016 | |
| Internal enquiry regarding the suitability of a product called Rexol for use in petrol tanks. | 5th Jun 1939 | Box 151 \ 1 scan0017 | |
| Composition of a substance named REXOL, identified as petrol with castor oil, with potential for future testing. | 6th Jun 1939 | Box 151 \ 1 scan0018 | |
| Letter from The Associated Ethyl Company regarding American automotive developments like the fluid fly-wheel and hydraulic tappets. | 29th Jun 1939 | Box 151 \ 1 scan0019 | |
| Letter from Shell-Mex discussing the new 'Shell' petrol and discrepancies in Bentley instruction manuals regarding fuel types. | 1st Aug 1939 | Box 151 \ 1 scan0020 | |
| Request to Shell for a supply of No.1 petrol for detonation experiments. | 18th Oct 1939 | Box 151 \ 1 scan0021 | |
| Official order be sent to Messrs. Sanderson & Holmes for petrol and brake fluid. | 19th Oct 1939 | Box 151 \ 1 scan0022 | |
| Letter from The Petroleum Board requesting clarification on the quantity of petrol required for experimental purposes. | 19th Oct 1939 | Box 151 \ 1 scan0023 | |
| Letter to The Petroleum Board clarifying a request for a quantity of petrol. | 20th Oct 1939 | Box 151 \ 1 scan0024 | |
| Internal request to place an official order for quantities of pool petrol from Messrs. Sanderson & Holmes. | 21th Oct 1939 | Box 151 \ 1 scan0025 | |
| Invoice from Rotol Airscrews Ltd. for petrol put into a Bentley Car, querying if it was for an experimental matter. | 23th Oct 1939 | Box 151 \ 1 scan0026 | |
| Official order for pool petrol for two chassis. | 24th Oct 1939 | Box 151 \ 1 scan0027 | |
| Request to issue an official order for 13 gallons of Pool Petrol from Messrs. Sanderson & Holmes. | 25th Oct 1939 | Box 151 \ 1 scan0028 | |
| Request to send an official order to Messrs. Sanderson & Holmes for 11 gallons of pool petrol. | 26th Oct 1939 | Box 151 \ 1 scan0029 | |
| Order for 25 cans of Shell No.1 Petrol from the Petroleum Board. | 26th Oct 1939 | Box 151 \ 1 scan0030 | |
| Request to arrange payment to Rotal Airscrews Ltd. for 10 gallons of petrol. | 27th Oct 1939 | Box 151 \ 1 scan0031 | |
| Request to send an official order to Messrs. Sanderson & Holmes for 6 gallons of pool petrol. | 31th Oct 1939 | Box 151 \ 1 scan0032 | |
| Internal request to send an official order to Sanderson & Holmes for petrol and various rubber parts. | 1st Nov 1939 | Box 151 \ 1 scan0033 | |
| Request to send an official order to Messrs. Sanderson & Holmes for a supply of petrol. | 2nd Nov 1939 | Box 151 \ 1 scan0034 | |
| Supply of 50-gallons of Pool petrol for the Car Test Beds. | 7th Nov 1939 | Box 151 \ 1 scan0035 | |
| Requesting an order for 400 gallons of pool petrol. | 8th Nov 1939 | Box 151 \ 1 scan0036 | |
| Request to place an official order for quantities of pool petrol from Sanderson & Holmes. | 8th Nov 1939 | Box 151 \ 1 scan0037 | |
| Request to send an official order for 12 gallons of pool petrol for vehicle 9.B.V. | 10th Nov 1939 | Box 151 \ 1 scan0038 | |
| Official order for 12 gallons of pool petrol for vehicle 10.B.V. | 16th Nov 1939 | Box 151 \ 1 scan0039 | |
| Request to send an official order to Sanderson & Holmes for petrol and rubber shims which have already been supplied. | 22th Nov 1939 | Box 151 \ 1 scan0040 | |
| To Mr. Lomas regarding a log book for 9.B.V. and a request to obtain petrol coupons. | 23th Nov 1939 | Box 151 \ 1 scan0041 | |
| Official order for 8 gallons of pool petrol that has already been supplied. | 30th Nov 1939 | Box 151 \ 1 scan0042 | |
| Internal request to place an order for petrol, rubber shims, upholstery solution, and a license holder. | 30th Nov 1939 | Box 151 \ 1 scan0043 | |
| Request for an official order to be sent to Messrs. Sanderson & Holmes for a supply of pool petrol. | 4th Dec 1939 | Box 151 \ 1 scan0044 | |
| Requesting an official order for a petrol supply. | 6th Dec 1939 | Box 151 \ 1 scan0045 | |
| Official order to be sent to Messrs. Sanderson & Holmes for petrol and a licence holder. | 8th Dec 1939 | Box 151 \ 1 scan0046 | |
| Official order for 17 gallons of pool petrol and a Nu-stickon licence holder. | 8th Dec 1939 | Box 151 \ 1 scan0047 | |
| Requesting an official order for 13 gallons of pool petrol to be sent to Messrs. Sanderson & Holmes. | 13th Dec 1939 | Box 151 \ 1 scan0048 | |
| Request to send an official order for various quantities of pool petrol. | 20th Dec 1939 | Box 151 \ 1 scan0049 | |
| Requesting an official order for 13 gallons of pool petrol from Messrs. Sanderson & Holmes. | 28th Dec 1939 | Box 151 \ 1 scan0050 | |
| Letter acknowledging the receipt of petrol coupons. | 9th Feb 1940 | Box 151 \ 1 scan0051 | |
| Letter from the Divisional Petroleum Office regarding the bulk supply of petrol coupons. | 8th Feb 1940 | Box 151 \ 1 scan0052 | |
| Increasing insurance coverage for petrol storage at Shardlow Garage. | 12th Feb 1940 | Box 151 \ 1 scan0053 | |
| Letter to the Divisional Petroleum Officer requesting a further bulk supply. | 22th Feb 1940 | Box 151 \ 1 scan0054 | |
| Official order for 12 gallons of pool petrol from Messrs Sanderson & Holmes. | 24th Feb 1940 | Box 151 \ 1 scan0055 | |
| Increase in petrol storage capacity and cost at Shardlow Garage. | 27th Feb 1940 | Box 151 \ 1 scan0056 | |
| Letter acknowledging the receipt of petrol coupons. | 28th Feb 1940 | Box 151 \ 1 scan0057 | |
| Letter from the Divisional Petroleum Office regarding the bulk supply of petrol coupons. | 27th Feb 1940 | Box 151 \ 1 scan0058 | |
| Letter to the Divisional Petroleum Officer regarding the return of unused fuel coupons. | 1st Mar 1940 | Box 151 \ 1 scan0059 | |
| Request for an official order to be sent to Messrs. Sanderson & Holmes for 4-gallons of Pool Petrol. | 1st Mar 1940 | Box 151 \ 1 scan0060 | |
| Letter from the Divisional Petroleum Office acknowledging the receipt of petrol coupons for cancellation. | 4th Mar 1940 | Box 151 \ 1 scan0061 | |
| The discontinuation of petrol supply for commuting and the strict allocation of additional petrol coupons. | 5th Mar 1940 | Box 151 \ 1 scan0062 | |
| Letter from the Mines Department regarding returned petroleum coupons and bulk supply requirements. | 6th Mar 1940 | Box 151 \ 1 scan0063 | |
| Letter to the Divisional Petroleum Officer acknowledging the return of coupons representing 450 units. | 7th Mar 1940 | Box 151 \ 1 scan0064 | |
| Request to place an official order for pool petrol, inner tube repairs, and a piece of leather. | 7th Mar 1940 | Box 151 \ 1 scan0065 | |
| Gum build-up in petrol tanks due to Pool petrol, referencing an Autocar article and cleaning solutions. | 11th Mar 1940 | Box 151 \ 1 scan0066 | |
| Letter to the Divisional Petroleum Officer regarding the return and request for petrol coupons. | 2nd Apr 1940 | Box 151 \ 1 scan0067 | |
| Letter to the Petroleum Officer regarding the bulk supply of petrol coupons. | 9th Apr 1940 | Box 151 \ 1 scan0068 | |
| Letter regarding the bulk supply of petrol coupons from the Divisional Petroleum Office. | 5th Apr 1940 | Box 151 \ 1 scan0069 | |
| Letter from the Mines Department regarding a request for supplementary petrol for long road journeys. | 12th Apr 1940 | Box 151 \ 1 scan0070 | |
| Letter requesting an application form for petrol for business purposes. | 16th Apr 1940 | Box 151 \ 1 scan0071 | |
| Letter from the Divisional Petroleum Office regarding a fuel application for car C.HP 194, returning the forms for an employer's recommendation. | 9th Apr 1940 | Box 151 \ 1 scan0072 | |
| Letter concerning the bulk supply of petrol for development purposes and associated Admiralty certification. | 15th Apr 1940 | Box 151 \ 1 scan0073 | |
| Letter regarding the non-renewal of a supply request and potential future needs for Admiralty work. | 15th Apr 1940 | Box 151 \ 1 scan0074 | |
| Letter to Kenneth Hunt of The Petroleum Board regarding a previous letter and a future demonstration. | 18th Apr 1940 | Box 151 \ 1 scan0075 | |
| Provision of petrol coupons for two cars in Southampton requiring a check-up for cylinder wear. | 26th Apr 1940 | Box 151 \ 1 scan0076 | |
| Expired petrol coupons and referring the matter to Mr. Grylls. | 2nd May 1940 | Box 151 \ 1 scan0077 | |
| Letter to Kenneth Hunt of The Petroleum Board regarding a meeting with Mr. Morris of S.U. Carburetter Co. | 2nd May 1940 | Box 151 \ 1 scan0078 | |
| Letter from The Petroleum Board regarding the development of a fuel injection pump and safety fuels. | 1st May 1940 | Box 151 \ 1 scan0079 | |
| Letter to the Divisional Petroleum Officer regarding the return of fuel coupons for cancellation. | 2nd May 1940 | Box 151 \ 1 scan0080 | |
| Internal memorandum regarding the supply of petrol coupons for a demonstration vehicle. | 2nd May 1940 | Box 151 \ 1 scan0081 | |
| Letter from the Divisional Petroleum Office acknowledging the cancellation of 408 coupon units. | 6th May 1940 | Box 151 \ 1 scan0082 | |
| Petrol vouchers used for the collection and delivery of a chassis offered decarbonisation at a special rate. | 7th May 1940 | Box 151 \ 1 scan0083 | |
| Request to obtain a petrol ration book for Mr. Lappin's Bentley B.22.A.W. | 9th May 1940 | Box 151 \ 1 scan0084 | |
| The recovery of petrol coupons for business travel. | 15th May 1940 | Box 151 \ 1 scan0085 | |
| Short, signed memo requesting to be put on the 'Drivers List'. | 16th May 1940 | Box 151 \ 1 scan0086 | |
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