| Description | Date | Identifier | |
| Letter from S.U. Carburetter Co. Ltd. discussing vacuum-controlled ignition and carburetter float chamber tilt angles. | 3rd Dec 1940 | Box 121 \ 3 scan0099 | |
| Letter to S.U. Carburettors Ltd. regarding carburettor performance and potential modifications. | 3rd Dec 1940 | Box 121 \ 3 scan0100 | |
| Follow-up letter to The S.U. Carburetter Co. Ltd. regarding sticking air valves and requesting a list of needles. | 19th Dec 1940 | Box 121 \ 3 scan0101 | |
| Requesting the dispatch of diaphragm units to S.U. Co. Ltd. for modification. | 1st Jan 1941 | Box 121 \ 3 scan0102 | |
| Letter to The S.U. Carburetter Co. Ltd. regarding the dispatch of diaphragms for petrol pump units. | 1st Jan 1941 | Box 121 \ 3 scan0103 | |
| Letter requesting two 5x16 inch Avon tyres for a car. | 30th Dec 1940 | Box 121 \ 3 scan0104 | |
| Letter to S.U. Carburettors Ltd. acknowledging receipt of their letter from the 9th of December. | 13th Dec 1940 | Box 121 \ 3 scan0105 | |
| Letter from S.U. Carburetter Co. Ltd. discussing sticking piston trouble and float chamber design. | 23th Dec 1940 | Box 121 \ 3 scan0106 | |
| Letter from The S.U. Carburetter Co. Ltd. apologising for a delayed response due to moving their plant. | 26th Dec 1940 | Box 121 \ 3 scan0107 | |
| Letter from S.U. Carburetter Co. Ltd. regarding a lost letter and enclosing a needle chart and catalogue. | 27th Dec 1940 | Box 121 \ 3 scan0108 | |
| Invoice received from S.U. Carburetter Co. Ltd. for a pair of carburettors. | 6th Jan 1941 | Box 121 \ 3 scan0109 | |
| Request for a covering order to pay for two carburetters received from the S.U. Carburetter Co. | 15th Jan 1941 | Box 121 \ 3 scan0110 | |
| Letter to The S.U. Carburetter Co. Ltd. discussing test results and design feedback on a special four-unit electric petrol pump. | 6th Feb 1941 | Box 121 \ 3 scan0111 | |
| Request to forward an item to the S.U. Carburetter Company for inspection and rectification. | 5th Feb 1941 | Box 121 \ 3 scan0112 | |
| Letter from S.U. Carburetter Co. Ltd. discussing issues with zinc base carburetters distorting at high temperatures. | 11th Feb 1941 | Box 121 \ 3 scan0113 | |
| Letter to S.U. Carburetter Co. regarding throttle body distortion from zinc base castings and the potential reversion to an original type for the Bentley V. | 16th Feb 1941 | Box 121 \ 3 scan0114 | |
| Letter from S.U. Carburetter Co. Ltd. regarding issues with zinc base die-casting distortion and pricing. | 18th Feb 1941 | Box 121 \ 3 scan0115 | |
| Recommended form of centre section of manifold for a single carburettor 4 or 6-cylinder engine, by The S.U. Co. | 12th Nov 1940 | Box 121 \ 3 scan0116 | |
| Letter to S.U. Carburetter Co. regarding a distorted throttle body on a new Bentley V production car carburettor. | 5th Feb 1941 | Box 121 \ 3 scan0117 | |
| Request to S.U. Carburetter Co. Ltd. for various carburetters and needles for experimental work. | 20th Aug 1941 | Box 121 \ 3 scan0118 | |
| Letter from The S.U. Carburetter Co. Ltd. regarding modifications to a small self-feeding carburetter. | 17th Nov 1941 | Box 121 \ 3 scan0119 | |
| Letter to The S.U. Carburettor Co. regarding the return of a small self-feeding carburettor for updates. | 24th Nov 1941 | Box 121 \ 3 scan0120 | |
| Despatch note for returning a Self-Feeding Carburetter to the S.U. Carburetter Co. for modification. | 24th Nov 1941 | Box 121 \ 3 scan0121 | |
| Letter from S.U. Carburetter Co. regarding the return and modification of an experimental carburetter. | 28th Nov 1941 | Box 121 \ 3 scan0122 | |
| Letter from S.U. Carburetter Co. Ltd. acknowledging receipt of an experimental carburetter for modifications. | 28th Nov 1941 | Box 121 \ 3 scan0123 | |
| Confirming the dispatch of two prints for a brake shoe guide (GB.5289). | 2nd Apr 1941 | Box 121 \ 3 scan0124 | |
| Request to despatch brake shoes and linings to New Hudson Ltd. for fitting. | 19th Apr 1941 | Box 121 \ 3 scan0125 | |
| Order acknowledgement slip from New Hudson Limited. | 23th Apr 1941 | Box 121 \ 3 scan0126 | |
| Letter from New-Hudson Ltd. concerning an order for relining brake shoes, including price and a damaged lining. | 23th Apr 1941 | Box 121 \ 3 scan0127 | |
| Letter from British Tyre & Rubber Co. Ltd. regarding a blueprint for a Brake Drum Assembly. | 26th Apr 1941 | Box 121 \ 3 scan0128 | |
| Requesting the despatch of brake shoes and linings to New Hudson Ltd. for fitting. | 28th Apr 1941 | Box 121 \ 3 scan0129 | |
| Letter to Bowden Wires Ltd. regarding bent wire assemblies needing straightening or renewal. | 29th Apr 1941 | Box 121 \ 3 scan0130 | |
| Letter from New Hudson Ltd. confirming the relining of 16 brake shoes with Ferodo material. | 29th Apr 1941 | Box 121 \ 3 scan0131 | |
| Letter from Bowden (Engineers) Ltd regarding six damaged assemblies and offering to repair or replace them. | 2nd May 1941 | Box 121 \ 3 scan0132 | |
| The dispatch of five damaged Bowden wire assemblies to Messrs Bowlen for repair. | 6th May 1941 | Box 121 \ 3 scan0133 | |
| Steady for rear brake shoes for the Senior Range. | 14th May 1941 | Box 121 \ 3 scan0134 | |
| Letter to New Hudson Ltd. regarding the relining of 16 brake shoes. | 28th Apr 1941 | Box 121 \ 3 scan0135 | |
| Brake wear chart and analysis of various cars. | 28th May 1941 | Box 121 \ 3 scan0136 | |
| Wider rear brakes with aluminium drums and shoes for Senior Range high-performance cars. | 28th May 1941 | Box 121 \ 3 scan0137 | |
| Seizure of handbrake shafts on two chassis and a proposed solution involving the lubrication system. | 30th May 1941 | Box 121 \ 3 scan0138 | |
| Front to rear brake wear ratios on various cars. | 2nd Jun 1941 | Box 121 \ 3 scan0139 | |
| Secret memo discussing modifications to cure handbrake seizures. | 6th Jun 1941 | Box 121 \ 3 scan0140 | |
| Letter to Automotive Products Co., Ltd. regarding the fitting of a light alloy master cylinder to an experimental car for hydraulic brakes. | 4th Jul 1941 | Box 121 \ 3 scan0141 | |
| Letter from Automotive Products Company Ltd. regarding the despatch of a wooden pattern for a master cylinder. | 18th Jul 1941 | Box 121 \ 3 scan0142 | |
| Experiments and proposed modifications to eliminate judder in the rationalised braking system. | 21th Jul 1941 | Box 121 \ 3 scan0143 | |
| Design notes regarding dust protection for a thrust race and modifications to an 8 arm star spring. | 21th Jul 1941 | Box 121 \ 3 scan0144 | |
| Experiments to remove judder from the rationalised braking system by fitting a star spring to the servo. | 21th Jul 1941 | Box 121 \ 3 scan0145 | |
| Modifications for an 8 arm star spring to prevent dust ingress and specify new dimensions. | 21th Jul 1941 | Box 121 \ 3 scan0146 | |
| Schematic diagram showing a star spring on a B V servo. | 21th Jul 1941 | Box 121 \ 3 scan0147 | |
| Request to the Pattern Shop to produce a pattern for a combined front drum and hub in aluminium alloy. | 14th Aug 1941 | Box 121 \ 3 scan0148 | |
| Requesting the casting of specific Lockheed pattern parts, noting a previous complaint from Lockheeds about a 50% scrap rate due to porosity. | 1st Sep 1941 | Box 121 \ 3 scan0149 | |
| Letter from Ferodo Limited confirming the production and dispatch date for required linings against specific drawing numbers. | 4th Sep 1941 | Box 121 \ 3 scan0150 | |
| Requesting the despatch of ten castings to The Lockheed Hydraulic Brake Co. Ltd. for machining. | 15th Sep 1941 | Box 121 \ 3 scan0151 | |
| Letter to Lockheed Hydraulic Brake Co. Ltd. regarding the handover of various castings for machining. | 15th Sep 1941 | Box 121 \ 3 scan0152 | |
| Visit from Mr. Parnell to discuss Lockheed and Myth brake systems. | 11th Sep 1941 | Box 121 \ 3 scan0153 | |
| Issues with sticking Girling expander units on experimental cars and potential solutions involving chromium plating. | 25th Sep 1941 | Box 121 \ 3 scan0154 | |
| Sticking Girling expander units on experimental cars and the proposed solution of chromium plating. | 25th Sep 1941 | Box 121 \ 3 scan0155 | |
| Confirmation memo to the Works Laboratory regarding the zinc plating of twelve cast iron rings. | 3rd Oct 1941 | Box 121 \ 3 scan0156 | |
| Sending of cast iron rings and a request to cast eleven brake drums in a special alloy. | 20th Oct 1941 | Box 121 \ 3 scan0157 | |
| Requesting the despatch of 8 brake shoes to Jack Barclay Esq. | 21th Oct 1941 | Box 121 \ 3 scan0158 | |
| The return of 4-wheel cylinder castings from the Lockheed Brake Co. due to machining issues. | 11th Nov 1941 | Box 121 \ 3 scan0159 | |
| Letter declining an enquiry for blanks for brake shoes due to the tooling being specific to another firm. | 17th Nov 1941 | Box 121 \ 3 scan0160 | |
| Letter to New Hudson Ltd. regarding blanks for special brake shoes required for a rig, referencing a similar type supplied for a Bentley V. | 19th Nov 1941 | Box 121 \ 3 scan0161 | |
| Letter from New-Hudson Ltd. acknowledging correspondence regarding an order for blanks for the Experimental Dept. | 21th Nov 1941 | Box 121 \ 3 scan0162 | |
| Request to place an official order with New Hudson Ltd. for two dozen brake shoe blanks. | 24th Nov 1941 | Box 121 \ 3 scan0163 | |
| Letter to Coventry Radiator & Presswork Co., Ltd. requesting the supply of brake shoe blanks for the Bentley V. | 15th Nov 1941 | Box 121 \ 3 scan0164 | |
| To the Development Foundry regarding casting wheel cylinders for hydraulic brakes. | 8th Dec 1941 | Box 121 \ 3 scan0165 | |
| Requesting two gross of No. 7 semi-tubular copper rivets for a B.V. Servo. | 30th Dec 1941 | Box 121 \ 3 scan0166 | |
| Letter to Lockheed Hydraulic Brake Co. requesting the machining of four wheel cylinder castings. | 1st Jan 1942 | Box 121 \ 3 scan0167 | |
| Letter from Automotive Products Company regarding their capacity to machine castings for Part No. GB.4178 due to their heavily loaded machine shop. | 8th Jan 1942 | Box 121 \ 3 scan0168 | |
| Requesting the despatch of brake shoe blanks and wheel cylinder castings to Lockheed for machining. | 22th Jan 1942 | Box 121 \ 3 scan0169 | |
| Letter to Lockheed Hydraulic Brake Co., Ltd. concerning the dispatch of brake shoe blanks and cylinder castings. | 22th Jan 1942 | Box 121 \ 3 scan0170 | |
| Letter from Automotive Products Company confirming receipt of brake shoe blanks and wheel cylinder castings for experimental brake equipment. | 29th Jan 1942 | Box 121 \ 3 scan0171 | |
| Solution of chromium plating brake wedges for use with aluminium casings. | 16th Feb 1942 | Box 121 \ 3 scan0172 | |
| B.V. Brakes and referencing a specimen to be sent. | 17th Feb 1942 | Box 121 \ 3 scan0173 | |
| Letter chasing a supplier for an overdue phosphor bronze spring plate. | 24th Feb 1942 | Box 121 \ 3 scan0174 | |
| Issues with the handbrake on the senior rationalised range freezing in snow and having excessive leverage. | 1st Mar 1944 | Box 121 \ 3 scan0175 | |
| Letter from The S.U. Company confirming they are sending three pairs of needles for experiments on the 3 ½ litre Bentley. | 15th Jan 1934 | Box 121 \ 4 scan0001 | |
| Letter from The S.U. Company confirming the production of two pairs of needles to given dimensions. | 1st Mar 1934 | Box 121 \ 4 scan0002 | |
| Letter from The S.U. Company querying a dimension for Needle X.C.2 and requesting confirmation. | 11th Jan 1935 | Box 121 \ 4 scan0003 | |
| Invoice from S.U. Company for parts, with a query about payment authorization. | 3rd Apr 1935 | Box 121 \ 4 scan0004 | |
| Requesting an official order be placed with the S.U. Company Ltd. for carburettor parts. | 6th Apr 1935 | Box 121 \ 4 scan0005 | |
| Letter to the S.U. Company regarding the return of incorrect carburettor needles and a request for replacements. | 25th Apr 1935 | Box 121 \ 4 scan0006 | |
| Returning seven faulty Bentley Carburetter needles and seatings for replacement. | 26th Apr 1935 | Box 121 \ 4 scan0007 | |
| Order for spherical cork washers for Bentley carburetters. | 27th Apr 1935 | Box 121 \ 4 scan0008 | |
| Return of faulty S.U. carburetter needles and seatings for replacement. | 1st May 1935 | Box 121 \ 4 scan0009 | |
| Complaint letter to S.U. Company Ltd. regarding faulty replacement carburetter needles and seatings. | 1st May 1935 | Box 121 \ 4 scan0010 | |
| Letter from S.U. Company apologising for an incorrect order and delayed response. | 1st May 1935 | Box 121 \ 4 scan0011 | |
| Letter from S.U. Carburetter Company regarding an inspection of carburetter needles and seatings following a complaint about roughness. | 2nd May 1935 | Box 121 \ 4 scan0012 | |
| Letter to The S.U. Co. Ltd. regarding an order for a single coil and resistance winding. | 3rd May 1935 | Box 121 \ 4 scan0013 | |
| Letter to T.C. Skinner of The S.U. Company Ltd. regarding the return of needles with a bad finish. | 7th May 1935 | Box 121 \ 4 scan0014 | |
| Apology from the S.U. Company for damaged carburetter needles caused by incorrect assembly tools. | 10th May 1935 | Box 121 \ 4 scan0015 | |
| Letter to S.U. Company Ltd. regarding float chambers, valves, and an engine cutting-out issue on an Aston Martin. | 14th May 1935 | Box 121 \ 4 scan0016 | |
| List of criticisms regarding a new S.U. float chamber for Bentley. | 14th May 1935 | Box 121 \ 4 scan0017 | |
| List of observations and proposed changes for engine components. | 15th May 1935 | Box 121 \ 4 scan0018 | |
| Letter to the S.U. Company Ltd. concerning carburetter float chamber problems and other component developments. | 15th May 1935 | Box 121 \ 4 scan0019 | |
| Letter from The S.U. Company regarding replacement needles, float chambers and a cutting-out issue. | 15th May 1935 | Box 121 \ 4 scan0020 | |
| Letter from The S.U. Company acknowledging receipt of a letter with criticisms on their float chamber. | 16th May 1935 | Box 121 \ 4 scan0021 | |
| Letter from The S.U. Company discussing the production of float chambers and the creation of a die for a toggle mechanism. | 23th May 1935 | Box 121 \ 4 scan0022 | |
| Letter from The S.U. Company concerning the dispatch of five needles and seats. | 23th May 1935 | Box 121 \ 4 scan0023 | |
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