| Description | Date | Identifier | |
| Letter from The S.U. Company regarding the clearance of a 5BA brass screw and washer. | 22th Nov 1935 | Box 27a \ 2 Scan281 | |
| Letter to The S.U. Company Ltd. detailing issues with pumps supplied for the Bentley chassis. | 4th Dec 1933 | Box 27a \ 2 Scan282 | |
| Concluding page of a letter to S.U. Company regarding a noise in operation. | 6th Dec 1933 | Box 27a \ 2 Scan283 | |
| Letter from The S.U. Company regarding the design and function of a sample reserve petrol tap. | 6th Dec 1933 | Box 27a \ 2 Scan284 | |
| Letter from The S.U. Company acknowledging receipt of a letter regarding petrol pumps. | 6th Dec 1933 | Box 27a \ 2 Scan285 | |
| Letter from the Experimental Dept. to The S.U. Company acknowledging receipt of letters and a tap for testing. | 7th Dec 1933 | Box 27a \ 2 Scan286 | |
| The results of tests comparing the flow rate of an S.U. petrol tap with a standard system. | 12th Dec 1933 | Box 27a \ 2 Scan287 | |
| Chasing an outstanding order for three S.U. Petrol Pumps. | 20th Dec 1933 | Box 27a \ 2 Scan288 | |
| Advising on the correct cold starting procedure for 3 1/2 litre Bentley petrol pumps. | 20th Dec 1933 | Box 27a \ 2 Scan289 | |
| Letter to Aston Martin inquiring about the source and properties of flexible exhaust piping. | 10th Mar 1933 | Box 27a \ 3 Scan001 | |
| Letter from Aston Martin regarding the supplier and use of flexible exhaust piping. | 13th Mar 1933 | Box 27a \ 3 Scan002 | |
| Letter to The Power Flexible Tubing Co. Ltd. requesting samples of flexible tubing for car exhausts. | 16th Mar 1933 | Box 27a \ 3 Scan003 | |
| Letter to The Power Flexible Tubing Co. requesting recommendations for fixing flexible exhaust tubing and discussing a sample. | 16th Mar 1933 | Box 27a \ 3 Scan004 | |
| Request to send an official order for various lengths of flexible exhaust piping. | 16th Mar 1933 | Box 27a \ 3 Scan005 | |
| Letter from The Power Flexible Tubing Co. Ltd. regarding a new type of flexible petrol hose. | 15th Mar 1933 | Box 27a \ 3 Scan006 | |
| Letter from The Power Flexible Tubing Co., Ltd. discussing flexible tubing options for exhaust pipes. | 15th Mar 1933 | Box 27a \ 3 Scan007 | |
| Letter from a supplier recommending their steel welded seamless tubing over their asbestos-based 'Tuboflex' hose for an exhaust connection. | 17th Mar 1933 | Box 27a \ 3 Scan008 | |
| Letter from The Power Flexible Tubing Company, Ltd. awaiting an official order. | 17th Mar 1933 | Box 27a \ 3 Scan009 | |
| Letter from a supplier confirming the dispatch of flexible exhaust piping, explaining a size difference due to metric tooling. | 7th Apr 1933 | Box 27a \ 3 Scan010 | |
| Letter to a supplier acknowledging receipt of flexible exhaust pipes and requesting more tubing. | 11th Apr 1933 | Box 27a \ 3 Scan011 | |
| Order for various lengths of flexible petrol hose from the Power Flexible Tubing Co. | 4th May 1933 | Box 27a \ 3 Scan012 | |
| Sending a 20 HP car to London and gathering competitor radiator specifications. | 22th Sep 1923 | Box 27a \ 3 Scan013 | |
| Decision to discontinue the use of Sodium Phosphate in radiators as a corrosion preventative. | 6th Dec 1929 | Box 27a \ 3 Scan014 | |
| Letter from an inventor about a provisional patent for an improved motor car radiator. | 6th Dec 1929 | Box 27a \ 3 Scan015 | |
| From Edward a Down regarding waiting to hear about a trip to Somerset. | 11th Sep 1925 | Box 27a \ 3 Scan016 | |
| Letter responding to an undated inquiry about a new radiator design, requesting a sketch. | 11th Sep 1925 | Box 27a \ 3 Scan017 | |
| Letter regarding a sample device to be tested by blowing air through it, potentially for a vehicle's cooling or ventilation system. | 12th Sep 1925 | Box 27a \ 3 Scan018 | |
| Letter proposing a new radiator design, referencing a sample and a provisional patent. | 14th Sep 1925 | Box 27a \ 3 Scan019 | |
| Letter proposing a business partnership regarding patenting costs and royalties for a car. | 15th Sep 1925 | Box 27a \ 3 Scan020 | |
| Rejection letter for a submitted model of a radiator. | 15th Sep 1925 | Box 27a \ 3 Scan021 | |
| The dispatch of a small radiator matrix model to the stores for examination and subsequent return. | 15th Sep 1925 | Box 27a \ 3 Scan022 | |
| Washing of a radiator and a suggestion to analyse the water used. | 6th May 1929 | Box 27a \ 3 Scan023 | |
| Laboratory report detailing the analysis of severe corrosion found in a radiator after only four months of service. | 6th May 1929 | Box 27a \ 3 Scan024 | |
| Typed memo responding to suggestions regarding valve noise and asbestos grummets. | 10th Jun 1929 | Box 27a \ 3 Scan025 | |
| Letter detailing engine cooling performance of car 21EX on mountain passes. | 29th Jun 1929 | Box 27a \ 3 Scan026 | |
| Letter arranging the completion and delivery of parts, with personal notes. | 29th Jun 1929 | Box 27a \ 3 Scan027 | |
| Letter discussing car performance issues like temperature rise and brake ineffectiveness. | 16th Jul 1929 | Box 27a \ 3 Scan028 | |
| Inferior quality of ferobestos liners for production radiator mountings. | 16th Jul 1929 | Box 27a \ 3 Scan029 | |
| Directive to implement a new hydraulic resistance test for radiators following complaints of them becoming choked. | 24th Jul 1929 | Box 27a \ 3 Scan030 | |
| Procedure for testing and cleaning choked radiators for CL Series vehicles and onwards. | 26th Jul 1929 | Box 27a \ 3 Scan031 | |
| Procedure for cleaning choked radiators using a caustic solution. | 26th Jul 1929 | Box 27a \ 3 Scan032 | |
| Requesting an order for new special radiator tubes with increased water space to fit 50 chassis. | 26th Jul 1929 | Box 27a \ 3 Scan033 | |
| Trials on modified radiator tubes to increase water space and a proposal for a new design. | 8th Aug 1929 | Box 27a \ 3 Scan034 | |
| Query regarding the confirmation to order radiators with 5 5/8 x 7 m/m tubes for FB2 series cars without further testing or standardisation sheets. | 12th Aug 1929 | Box 27a \ 3 Scan035 | |
| To increase the order of new type tubes for J.2 series radiators to cover all series. | 13th Aug 1929 | Box 27a \ 3 Scan036 | |
| Methods for cleaning and preventing corrosion in radiators. | 13th Aug 1929 | Box 27a \ 3 Scan037 | |
| Impact of increasing water space between radiator tubes. | 13th Aug 1929 | Box 27a \ 3 Scan038 | |
| Cover letter sending advance information regarding the cleaning of radiators. | 14th Aug 1929 | Box 27a \ 3 Scan039 | |
| Depot sheet detailing the cause and remedy for restricted water circulation in radiators. | 13th Aug 1939 | Box 27a \ 3 Scan040 | |
| Radiator obstruction, comparing aluminium to cast iron, and detailing a cleaning procedure. | 13th Aug 1939 | Box 27a \ 3 Scan041 | |
| Radiator restriction tests comparing water flow through various radiator types and components. | 13th Aug 1939 | Box 27a \ 3 Scan042 | |
| Blueprint of a Radiator Test Rig. | 14th Aug 1929 | Box 27a \ 3 Scan043 | |
| Cover page with a Print Room date stamp. | 14th Aug 1929 | Box 27a \ 3 Scan044 | |
| Blueprint showing radiator matrix and tube dimensions for various models. | 13th Jun 1929 | Box 27a \ 3 Scan045 | |
| Depot sheet detailing the cause and remedy for restricted water circulation in radiators due to clay-like deposits. | 13th Aug 1928 | Box 27a \ 3 Scan046 | |
| Radiator obstruction, corrosion in aluminum heads, and cleaning methods. | 13th Aug 1928 | Box 27a \ 3 Scan047 | |
| Radiator restriction tests comparing water flow through various models. | 16th Aug 1929 | Box 27a \ 3 Scan048 | |
| Experiments on radiator corrosion and the conclusions drawn from the tests. | 16th Aug 1929 | Box 27a \ 3 Scan049 | |
| List of tests applied during radiator corrosion experiments. | 16th Aug 1929 | Box 27a \ 3 Scan050 | |
| List of particulars for a series of radiator corrosion experiments. | 16th Aug 1929 | Box 27a \ 3 Scan051 | |
| Results of radiator corrosion experiments in a table format. | 16th Aug 1929 | Box 27a \ 3 Scan052 | |
| Table detailing the results of radiator corrosion experiments on different materials. | 16th Aug 1929 | Box 27a \ 3 Scan053 | |
| Table detailing the results of radiator corrosion experiments. | 16th Aug 1929 | Box 27a \ 3 Scan054 | |
| The supply and allocation of radiator tubes for experimental and production radiators. | 22th Aug 1929 | Box 27a \ 3 Scan055 | |
| Requesting an update on the current position regarding the fitting of a tapered radiator. | 23th Aug 1929 | Box 27a \ 3 Scan056 | |
| Design points for bonnets and radiators, including fitting a tapered radiator to a Phantom. | 29th Jul 1929 | Box 27a \ 3 Scan057 | |
| Recommendations to prevent radiator blockages using distilled water and sodium phosphate. | 26th Aug 1929 | Box 27a \ 3 Scan058 | |
| Procedure for cleaning a completely or partially blocked radiator using caustic soda and an air blast. | 26th Aug 1929 | Box 27a \ 3 Scan059 | |
| Proposal for a new cooling system maintenance procedure using sodium phosphate and a plan to circulate a pamphlet to owners. | 29th Aug 1929 | Box 27a \ 3 Scan060 | |
| Challenges of fitting a new radiator and bonnet to an experimental chassis. | 29th Aug 1929 | Box 27a \ 3 Scan061 | |
| Objections to a proposed procedure for radiators, with the discussion deferred until after the Schneider Cup. | 5th Sep 1929 | Box 27a \ 3 Scan062 | |
| Customer inconvenience and damage caused by radiator design, particularly the need for distilled water and overheating issues. | 30th Aug 1929 | Box 27a \ 3 Scan063 | |
| Ongoing issues with car radiators, customer complaints of overheating, and proposed solutions. | 27th Sep 1929 | Box 27a \ 3 Scan064 | |
| Radiator design alteration due to corrosion from aluminium cylinder heads and test results on new tubes. | 14th Oct 1929 | Box 27a \ 3 Scan065 | |
| Precautions necessary for producing Staybrite radiators to prevent leaking. | 14th Oct 1929 | Box 27a \ 3 Scan066 | |
| Tests to determine the optimal restriction for a radiator outlet pipe to maintain cooling efficiency. | 15th Oct 1929 | Box 27a \ 3 Scan067 | |
| Use and production of Staybrite and chromium finishes for radiators and bonnet fittings. | 15th Oct 1929 | Box 27a \ 3 Scan068 | |
| Cover note regarding a translated letter from the Cozette Company, seeking instructions on how to respond. | 16th Oct 1929 | Box 27a \ 3 Scan069 | |
| Translated letter from Cozette in Paris to Gallay Radiators regarding supercharging an engine. | 11th Oct 1929 | Box 27a \ 3 Scan070 | |
| Preferred radiator tube scheme for the 40/50 HP chassis. | 17th Oct 1929 | Box 27a \ 3 Scan071 | |
| Trouble with Staybrite steel radiators and the despatch of car GXO-46. | 17th Oct 1929 | Box 27a \ 3 Scan072 | |
| Radiator boiling issue on a Phantom car and the challenges in diagnosing it. | 26th Oct 1929 | Box 27a \ 3 Scan073 | |
| Analysis of the causes and composition of sludge build-up in car radiators, with a proposed preventative heat treatment. | 26th Oct 1929 | Box 27a \ 3 Scan074 | |
| Treatments for cylinder blocks and radiators to prevent corrosion and improve performance. | 2nd Nov 1929 | Box 27a \ 3 Scan075 | |
| The causes of car radiator blockage due to oxidation and sediment formation. | 2nd Nov 1929 | Box 27a \ 3 Scan076 | |
| Radiator filter being fitted to the 23-EX test car along with automatic shutters. | 17th Dec 1929 | Box 27a \ 3 Scan077 | |
| Suggested amendment to Depot Sheet 118 regarding overheating and water treatment. | 9th Nov 1929 | Box 27a \ 3 Scan078 | |
| Amended Depot Sheet, clarifying how to differentiate between chronic and mild cases of choked radiators based on mileage. | 11th Nov 1929 | Box 27a \ 3 Scan079 | |
| Depot sheet outlining ongoing investigations into preventing corrosion, water loss, and cleaning engine components. | 8th Nov 1929 | Box 27a \ 3 Scan080 | |
| Laboratory report on the analysis and effects of reusing different types of glycerin in radiator systems. | 20th Nov 1929 | Box 27a \ 3 Scan081 | |
| The properties and risks of using glycerin, specifically its effect on metallic compounds, aluminium, and radiator solder. | 22th Nov 1929 | Box 27a \ 3 Scan082 | |
| The difficulty in obtaining choked radiator matrixes for testing and requesting authority over the issue to prevent further costs. | 22th Nov 1929 | Box 27a \ 3 Scan083 | |
| Calling for an urgent conference to discuss problems with the blocking up of radiators. | 22th Nov 1929 | Box 27a \ 3 Scan084 | |
| Causes and potential solutions for radiator blockage, involving water chemistry and material compatibility. | 22th Nov 1929 | Box 27a \ 3 Scan085 | |
| Sending a sketch for a new, cleanable car radiator design for testing. | 25th Nov 1929 | Box 27a \ 3 Scan086 | |
| Preventing radiator corrosion using sodium phosphate, analyzing its effects on various water types and engine materials. | 27th Nov 1929 | Box 27a \ 3 Scan087 | |
| Aluminium alloy corrosion, the effects of zinc, and cadmium plating for protection. | 28th Nov 1929 | Box 27a \ 3 Scan088 | |
| Ordering anhydrous di-sodium hydrogen phosphate tablets to address radiator troubles. | 28th Nov 1929 | Box 27a \ 3 Scan089 | |
| Inspection report on the overuse of Sodium Phosphate in car radiators, detailing issues with water loss and frothing. | 2nd Jun 1929 | Box 27a \ 3 Scan090 | |
| Radiator splashing issue on a car, even with a low water level. | 2nd Dec 1929 | Box 27a \ 3 Scan091 | |
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