| Description | Date | Identifier | |
| Internal request to order 'T' Aviation Mix Ethyl Fluid from the Ethyl Export Corp. | 13th Sep 1933 | Box 27a \ 4 Scan208 | |
| Two new Air Ministry specification fuels (DTD.224 & 230), detailing their octane ratings and testing on a Kestrel V engine. | 14th Sep 1935 | Box 27a \ 4 Scan209 | |
| Fuel calibration and investigation into improved ratings for the Goshawk engine. | 14th Sep 1933 | Box 27a \ 4 Scan210 | |
| Comparison of fuel performance (D.T.D.224, D.T.D.134, D.T.D.230) in Kestrel and Goshawk engines using evaporative cooling. | 14th Sep 1933 | Box 27a \ 4 Scan211 | |
| Investigation into an improved power rating for the Goshawk engine, comparing different fuel types and their performance characteristics. | 14th Sep 1933 | Box 27a \ 4 Scan212 | |
| Continued report on Goshawk engine ratings, discussing detonation, boost, and potential supercharger improvements compared to the Kestrel engine. | 14th Sep 1933 | Box 27a \ 4 Scan213 | |
| Laboratory reports on two different fuel samples (DTD.224 and DTD.230), detailing their properties. | 29th Aug 1933 | Box 27a \ 4 Scan214 | |
| Power consumption curves for a Goshawk fully supercharged engine. | 12th Sep 1938 | Box 27a \ 4 Scan215 | |
| Blank document page with a Print Room stamp from Derby. | 14th Sep 1933 | Box 27a \ 4 Scan216 | |
| Power and specific fuel consumption curves for a Goshawk fully supercharged engine. | 12th Sep 1935 | Box 27a \ 4 Scan217 | |
| Graph showing engine fuel consumption loops for the calibration of 87 and 77 octane fuels. | 12th Sep 1935 | Box 27a \ 4 Scan218 | |
| Rated altitude power curve graph for a fully supercharged engine. | 12th Sep 1935 | Box 27a \ 4 Scan219 | |
| Stamped by the Print Room in Derby. | 14th Sep 1933 | Box 27a \ 4 Scan220 | |
| Letter to the Air Ministry detailing the reasons for wishing to use 87 octane fuel for testing Goshawk engines. | 15th Sep 1933 | Box 27a \ 4 Scan221 | |
| The advantages of 87 octane fuel for the Goshawk engine and a request for its use in type tests. | 15th Sep 1933 | Box 27a \ 4 Scan222 | |
| Request from the Air Ministry to supply 2 gallons of special safety fuel for testing at the Air Ministry Laboratory. | 15th Sep 1933 | Box 27a \ 4 Scan223 | |
| Letter confirming the dispatch of 2 gallons of Special Safety Fuel for testing purposes. | 19th Sep 1933 | Box 27a \ 4 Scan224 | |
| Letter to the Air Ministry confirming the despatch of two gallons of Special Safety Fuel for testing purposes. | 19th Sep 1933 | Box 27a \ 4 Scan225 | |
| Notification of the receipt of 12 cans of Ethyl Fluid from the Ethyl Export Corporation. | 19th Sep 1933 | Box 27a \ 4 Scan226 | |
| Responding to an enquiry about 'Koolmotor' fuel. | 19th Sep 1933 | Box 27a \ 4 Scan227 | |
| Letter to Ethyl Export Corporation regarding permissible M.E.P. results for a Kestrel S. engine with different octane fuels. | 20th Sep 1933 | Box 27a \ 4 Scan228 | |
| Specification table comparing the Kestrel and Goshawk engines. | 20th Sep 1933 | Box 27a \ 4 Scan229 | |
| Letter from Ethyl Export Corporation thanking Rolls Royce for octane and engine rating information and discussing a 50-hour test on leaded fuel. | 21th Sep 1933 | Box 27a \ 4 Scan230 | |
| Cover note enclosing two letters from Cities Service Oil Co. Ltd. regarding Kool-Motor Alcohol Blend Fuel. | 21th Sep 1933 | Box 27a \ 4 Scan231 | |
| Letter from Cities Service Oil Company regarding the octane value and properties of alcohol fuel for aviation purposes. | 22th Sep 1933 | Box 27a \ 4 Scan232 | |
| Letter from an oil company proposing a collaborative test of an alcohol blend fuel in an aero engine. | 19th Sep 1933 | Box 27a \ 4 Scan233 | |
| Page 2 of a letter from Cities Service Oil Company Limited regarding the supply of fuel and oil for testing. | 25th Sep 1933 | Box 27a \ 4 Scan234 | |
| Request for a supply of neat Ethyl fluid (T.E.L.) for tests in France and advice on its container. | 25th Sep 1933 | Box 27a \ 4 Scan235 | |
| Letter from Speedhire Service Garage regarding their Speed No. 1 Motor Spirit. | 5th Oct 1933 | Box 27a \ 4 Scan236 | |
| Reprint from the 'Marylebone Mercury' detailing the results of 'Speed' petrol consumption tests. | 29th Sep 1933 | Box 27a \ 4 Scan237 | |
| Cover letter regarding an attached letter from the Ethyl Export Corporation about the fuel situation in Belgium. | 7th Oct 1933 | Box 27a \ 4 Scan238 | |
| Letter from the Ethyl Export Corporation regarding a meeting with the Belgian Air Ministry about fuel specifications. | 6th Oct 1933 | Box 27a \ 4 Scan239 | |
| Report from tester D. Jackson regarding the change to D.T.D.224 specification fuel in Belgium. | 21th Oct 1933 | Box 27a \ 4 Scan240 | |
| Urgent internal order for 12 cans of Ethyl Fluid from Ethyl Export Corporation Ltd. | 23th Oct 1933 | Box 27a \ 4 Scan241 | |
| Order of 4000 gallons of D.T.D.250 fuel for a type test. | 25th Oct 1933 | Box 27a \ 4 Scan242 | |
| Fuel for engines in Belgium, attaching related correspondence. | 28th Oct 1933 | Box 27a \ 4 Scan243 | |
| Letter from the Belgian Ministry of National Defense concerning a fuel change for Kestrel engines and its impact on the 'BOOST' setting. | 25th Oct 1933 | Box 27a \ 4 Scan244 | |
| Letter in French to the Belgian Aeronautical Service regarding engine operation with 77 octane fuel. | 28th Oct 1933 | Box 27a \ 4 Scan245 | |
| Laboratory report on a sample of Shell Fuel to D.T.D. Spec. 230. | 24th Nov 1933 | Box 27a \ 4 Scan246 | |
| Order for 12 cans of 'T' Aviation Mix Ethyl Fluid. | 1st Nov 1933 | Box 27a \ 4 Scan247 | |
| Letter declining a request to test a sample of Speed Petrol due to a lack of facilities and company policy. | 6th Nov 1933 | Box 27a \ 4 Scan248 | |
| Request to order 500 gallons of D.T.D.230 fuel from Shell Mex. & B.P. Ltd for testing. | 7th Nov 1933 | Box 27a \ 4 Scan249 | |
| Letter from Speedhire Service Garage concerning a sample of Speed petrol that could not be tested. | 7th Nov 1933 | Box 27a \ 4 Scan250 | |
| Fuel for engines in Belgium, referencing an attached letter sent to Colonel Verelst. | 8th Nov 1933 | Box 27a \ 4 Scan251 | |
| Letter to the Belgian Ministry of Defence regarding engine performance variations when changing fuels. | 8th Nov 1933 | Box 27a \ 4 Scan252 | |
| Order of 24 cans of Aviation Mix Ethyl Fluid. | 9th Nov 1933 | Box 27a \ 4 Scan253 | |
| To Despatch Stores regarding the return of an empty 2-gallon petrol tin. | 11th Nov 1933 | Box 27a \ 4 Scan254 | |
| Internal memorandum instructing that all future fuel orders must state the specific purpose for which the fuel is required. | 15th Nov 1933 | Box 27a \ 4 Scan255 | |
| Aero engine fuel specifications D.T.D. 224 & 230 and octane values for type tests. | 16th Nov 1933 | Box 27a \ 4 Scan256 | |
| Confirming the receipt of 24 cans of Aviation 'T' Mix Ethyl Fluid from The Ethyl Export Corporation Ltd. | 16th Nov 1935 | Box 27a \ 4 Scan257 | |
| Specification for D.T.D. 224/77 Octane Standard Fuel for aero-engines. | 1st Jan 1933 | Box 27a \ 4 Scan258 | |
| Specification notice for 87 Octane Standard fuel for aero-engines. | 1st Jan 1933 | Box 27a \ 4 Scan259 | |
| The octane value of a fuel consignment from Shell Mex Limited, making it unsuitable for type test running. | 18th Nov 1933 | Box 27a \ 4 Scan260 | |
| Instructions concerning aero engine fuel for type tests, highlighting an issue with fuel from Shell Mex Limited having an incorrect octane value. | 20th Nov 1933 | Box 27a \ 4 Scan261 | |
| Order of 4000 gallons of D.T.D.230 fuel for an EXPhantom III Type Test. | 22th Nov 1933 | Box 27a \ 4 Scan262 | |
| Query regarding payment for Schneider Trophy fuel used for tests on a 'Kestrel' Engine No.25. | 19th Dec 1933 | Box 27a \ 4 Scan263 | |
| For an attached list detailing specific gravity, distillation tests, and octane values of various petrols. | 8th Dec 1933 | Box 27a \ 4 Scan264 | |
| Comparison table of motor spirits from Summer 1933, detailing their properties and octane numbers. | 1st Jan 1933 | Box 27a \ 4 Scan265 | |
| Table comparing the specific gravity, distillation temperatures, and octane numbers of various fuel brands. | 15th Dec 1933 | Box 27a \ 4 Scan266 | |
| Confirming the receipt of 24 cans of Aviation 'T' Mixture Ethyl Fluid. | 15th Dec 1933 | Box 27a \ 4 Scan267 | |
| The substitution of a special aero engine fuel with a standard leaded fuel specification for supercharged engines. | 15th Dec 1933 | Box 27a \ 4 Scan268 | |
| Results of a test on Regent petrol, noting inconsistent carburation. | 18th Dec 1933 | Box 27a \ 4 Scan269 | |
| Change in aero engine fuel specification and handling of surplus stock. | 20th Dec 1933 | Box 27a \ 4 Scan270 | |
| Request to order 4,000 gallons of DTD.230 fuel for K.25 Valve-Development and P.V.12 Type tests. | 22th Dec 1933 | Box 27a \ 4 Scan271 | |
| Letter from Ethyl Export Corporation discussing testing methods for valve burning using saw cuts on valve seats. | 22th Nov 1933 | Box 27a \ 4 Scan272 | |
| Confirming the discontinuation of leaded fuel for type tests, to be substituted with a 50/50 Benzol mixture. | 23th Nov 1933 | Box 27a \ 4 Scan273 | |
| Letter concerning the logistical difficulties in obtaining prompt despatch of Ethyl Fluid from the Ethyl Export Corporation. | 24th Nov 1933 | Box 27a \ 4 Scan274 | |
| Initial tests of Regent petrol, noting poor performance regarding detonation and carburation. | 27th Nov 1933 | Box 27a \ 4 Scan275 | |
| Requesting an order of 48 cans of Aviation Mix Ethyl Fluid from the Ethyl Export Corp. | 29th Nov 1933 | Box 27a \ 4 Scan276 | |
| Circular letter from the Air Ministry regarding new aviation fuel specifications. | 23th Nov 1933 | Box 27a \ 4 Scan277 | |
| The conditions for using D.T.D. 230 - 87 Octane Standard Fuel. | 1st Dec 1933 | Box 27a \ 4 Scan278 | |
| Report from Tester Jackson in Belgium on the effects of new fuel D.T.D.224 on engine performance and required adjustments. | 1st Dec 1933 | Box 27a \ 4 Scan279 | |
| Letter from Silvertown Lubricants Limited regarding the composition and pricing of Running-in-Compound. | 1st Dec 1934 | Box 27a \ 4 Scan280 | |
| Letter from Ethyl Export Corporation concerning the supply of 1-litre cans of Ethyl Fluid for experimental work. | 1st Dec 1933 | Box 27a \ 4 Scan281 | |
| Letter discussing the reduction in use of 1-litre cans due to concerns about lead poisoning. | 4th Dec 1933 | Box 27a \ 4 Scan282 | |
| Laboratory report detailing the lead content found in a fuel sample. | 4th Dec 1933 | Box 27a \ 4 Scan283 | |
| Letter to Ethyl Export Corporation regarding the supply of high lead concentration petrol and reducing an order. | 4th Dec 1933 | Box 27a \ 4 Scan284 | |
| Letter from Ethyl Export Corporation regarding the supply of leaded petrol and arranging a meeting. | 5th Dec 1933 | Box 27a \ 4 Scan285 | |
| Complaints from fuel suppliers regarding insufficient time for testing new aero engine fuel specifications. | 15th Dec 1933 | Box 27a \ 4 Scan286 | |
| Inquiry about tests on Regent petrol from Trinidad Leaseholds. | 16th Feb 1934 | Box 27a \ 4 Scan287 | |
| Regent Petrol, its source from Trinidad Leaseholds Ltd, testing, and use. | 20th Feb 1934 | Box 27a \ 4 Scan288 | |
| Results of a 50-gallon fuel trial and the company's view on petrol brand claims. | 22th Feb 1934 | Box 27a \ 4 Scan289 | |
| Concerns from Regent Petrol about its performance and arranging a meeting with their expert. | 28th Feb 1934 | Box 27a \ 4 Scan290 | |
| Test report on a Phantom R.42 comparing the performance of Pratt's Ethyl and Regent Petrol. | 1st Mar 1934 | Box 27a \ 4 Scan291 | |
| The performance of Regent Petrol compared to Pratt's Ethyl Petrol in a Standard Phantom vehicle. | 5th Mar 1934 | Box 27a \ 4 Scan292 | |
| Proposal letter to E. Hives for testing a new alcohol-based motor fuel claimed to increase power and reduce carbon deposits. | 20th Mar 1934 | Box 27a \ 4 Scan293 | |
| Letter to E. Hives Esq. regarding an extract from an Italian Ministry of Agriculture report. | 15th Feb 1934 | Box 27a \ 4 Scan294 | |
| Translated digest from a report by the Italian Government Department of Agriculture on the patented fuel 'Alcoolina'. | 15th Feb 1934 | Box 27a \ 4 Scan295 | |
| Letter discussing the use of alternative fuels like alcohol and methanol in aero engines versus standard, widely available fuels for motorcars. | 23th Mar 1934 | Box 27a \ 4 Scan296 | |
| Summary of tests on the effect of alcohol and benzole additions on fuel consumption in different engines. | 1st Mar 1934 | Box 27a \ 4 Scan297 | |
| Fuel consumption tests comparing petrol with alcohol and benzole mixtures on different engines. | 3rd Apr 1934 | Box 27a \ 4 Scan298 | |
| Letter regarding the efficiency and effects of a new alcohol-based fuel on engines. | 3rd Apr 1934 | Box 27a \ 4 Scan299 | |
| Letter to E. Hives Esq. discussing the properties and potential of a new fuel containing 70% alcohol. | 3rd Apr 1934 | Box 27a \ 4 Scan300 | |
| Information to reply to a separate memo regarding Shell Mex & B.P. Ltd. | 16th Apr 1934 | Box 27a \ 4 Scan301 | |
| Query regarding a request from Shell Mex and B.P. Ltd. to purchase a sectioned synchro-mesh gearbox for advertising. | 13th Apr 1934 | Box 27a \ 4 Scan302 | |
| Follow-up note regarding correspondence with Shell Mex & B.P. Ltd. | 26th Apr 1934 | Box 27a \ 4 Scan303 | |
| Request for remarks on the use of alcohol fuels, specifically Koolmotor and Cleveland Discol, on company chassis. | 1st May 1934 | Box 27a \ 4 Scan304 | |
| Letter from Shell-Mex House to E. W. Hives requesting an appointment for lunch. | 5th May 1934 | Box 27a \ 4 Scan305 | |
| Letter from Trinidad Leaseholds Ltd. to Bentley Motors requesting results of tests on their motor spirits. | 7th May 1934 | Box 27a \ 4 Scan306 | |
| Request for fuel reports from Trinidad Leaseholds Ltd. | 9th May 1934 | Box 27a \ 4 Scan307 | |
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