| Description | Date | Identifier | |
| Letter from Ferodo Limited discussing issues with stencilling on servo motor clutch discs. | 17th Jul 1933 | Box 141 \ 3 scan0197 | |
| Notification of the change in designation for A.M.R.2. Ferodo Material for Bentley and 20/25-HP Chassis. | 21th Jul 1933 | Box 141 \ 3 scan0198 | |
| Letter to Ferodo Ltd. confirming a visit to discuss the lining of a servo motor. | 27th Jul 1933 | Box 141 \ 3 scan0199 | |
| Letter to Messrs Ferodo Ltd. following a visit, requesting the urgent supply of undrilled linings. | 9th Aug 1933 | Box 141 \ 3 scan0200 | |
| Letter from Ferodo Limited regarding the dispatch of linings and a query about servo motor torque. | 11th Aug 1933 | Box 141 \ 3 scan0201 | |
| Despatching four Ferodo clutch brake linings to Ferodo Ltd. for examination following customer complaints. | 21th Aug 1933 | Box 141 \ 3 scan0202 | |
| Letter to Ferodo Ltd. regarding slipping clutches, servo torque requirements, and ongoing experiments. | 22th Aug 1933 | Box 141 \ 3 scan0203 | |
| Requesting an official order for Ferodo's brake linings required for a 10,000 miles test. | 25th Aug 1935 | Box 141 \ 3 scan0204 | |
| Letter from Ferodo discussing brake servo motor test results, including torque and temperature, and arranging to examine clutch discs. | 25th Aug 1933 | Box 141 \ 3 scan0205 | |
| Letter to Messrs. Ferodo Ltd. arranging a visit to their works for Mr. Field's attention. | 26th Aug 1933 | Box 141 \ 3 scan0206 | |
| Letter from Ferodo Limited discussing the results of tests on a brake servo motor with different linings, RAD.13 and Ferodo Fibre 239A. | 30th Aug 1933 | Box 141 \ 3 scan0207 | |
| Letter from Ferodo Limited regarding the maximum coefficient of friction in the presence of grease. | 1st Sep 1933 | Box 141 \ 3 scan0208 | |
| Letter to Ferodo Ltd. regarding oil absorption in clutch discs and the performance of servo linings. | 1st Sep 1933 | Box 141 \ 3 scan0209 | |
| Letter from Ferodo Limited concerning the composition of oil in clutch discs and the performance of servo linings. | 5th Sep 1933 | Box 141 \ 3 scan0210 | |
| From ROY to Hs. regarding an enquiry from Richard Klinger Ltd about test results for their brake linings and gaskets. | 6th Sep 1933 | Box 141 \ 3 scan0211 | |
| The decision not to test Klinger brake linings. | 7th Sep 1933 | Box 141 \ 3 scan0212 | |
| Letter to Ferodo Ltd. about the performance and squeaking issues of FF.239 servo discs. | 13th Sep 1933 | Box 141 \ 3 scan0213 | |
| Letter from Ferodo Limited discussing test results and performance issues of brake linings for a servo motor. | 27th Sep 1933 | Box 141 \ 3 scan0214 | |
| Letter to Ferodo Ltd discussing issues and requirements for brake servo lining materials. | 28th Sep 1933 | Box 141 \ 3 scan0215 | |
| Letter from Ferodo discussing the failure of 'Cotton A' servo motor linings and proposing 'Ferodo S. 3914' as a replacement. | 3rd Oct 1933 | Box 141 \ 3 scan0216 | |
| Letter from Ferodo Limited concerning the supply and specifications of brake/clutch linings and discs. | 13th Oct 1933 | Box 141 \ 3 scan0217 | |
| Order of 24 servo discs in S.3914 material from Messrs Ferodo for testing purposes. | 13th Oct 1933 | Box 141 \ 3 scan0218 | |
| Letter to Ferodo Ltd. regarding the trial of S.3914 clutch discs, requesting further samples and discussing oil absorption issues. | 13th Oct 1933 | Box 141 \ 3 scan0219 | |
| Page 2 of a letter to Ferodo Ltd. seeking suggestions for a material to overcome slipping issues. | 15th Nov 1933 | Box 141 \ 3 scan0220 | |
| Letter to a supplier regarding issues with steel brake shoes and linings during testing. | 15th Nov 1933 | Box 141 \ 3 scan0221 | |
| Letter from Ferodo Limited discussing the thermal expansion and heat transference properties of different brake lining materials. | 20th Nov 1933 | Box 141 \ 3 scan0222 | |
| Letter from Ferodo Limited concerning brake lining rivets and materials, sheet 2. | 20th Jan 1933 | Box 141 \ 3 scan0223 | |
| Graph comparing the temperatures of a brake drum and brake lining over time during continuous running. | 20th Jan 1933 | Box 141 \ 3 scan0224 | |
| Confirming that servo friction discs are cleared for production after an investigation into printing effects. | 22th Nov 1933 | Box 141 \ 3 scan0225 | |
| Failures of Ferodo RAD.13 clutch lining material on Bentley cars and recommending a switch back to the standard 25 HP material. | 18th Dec 1933 | Box 141 \ 3 scan0226 | |
| Letter to Ferodo Ltd. regarding the examination of four failed Bentley clutch linings. | 13th Dec 1933 | Box 141 \ 3 scan0227 | |
| Letter from Ferodo Limited enclosing two blueprints for a brake torque arm assembly and ram and barrel particulars. | 13th Dec 1933 | Box 141 \ 3 scan0228 | |
| Inquiring about inefficient brakes on 20/25 chassis cars after washing. | 14th Dec 1933 | Box 141 \ 3 scan0229 | |
| Letter to Ferodo Ltd. regarding complaints of inefficient brakes on Bentley cars fitted with MR material. | 14th Dec 1933 | Box 141 \ 3 scan0230 | |
| Instructing not to order any more M.R. brake material for the 20/25 C.2. series cars. | 14th Dec 1933 | Box 141 \ 3 scan0231 | |
| Sample of Chekko-E non-metallic brake lining from Cresswell's Asbestos Company. | 15th Dec 1933 | Box 141 \ 3 scan0232 | |
| Ineffective brakes on 20/25 HP cars after washing. | 18th Dec 1933 | Box 141 \ 3 scan0233 | |
| Letter from Ferodo Limited discussing the performance of their brake linings regarding water effects and squealing. | 19th Dec 1933 | Box 141 \ 3 scan0234 | |
| Letter from Ferodo Limited detailing the properties and advantages of their bonded asbestos brake linings. | 20th Dec 1933 | Box 141 \ 3 scan0235 | |
| Letter from Ferodo Limited enclosing Diagram No. 453 for the attention of Mr. Grylls. | 20th Dec 1933 | Box 141 \ 3 scan0236 | |
| Graph comparing the temperatures of a brake drum and brake lining during continuous running. | 20th Nov 1933 | Box 141 \ 3 scan0237 | |
| Adoption of bifurcated rivetting for brake straps and clutch plates, and the necessary modifications. | 21th Dec 1933 | Box 141 \ 3 scan0238 | |
| Modifications to brake straps, linings, and clutches for Phantom II and 20/25 models. | 21th Dec 1933 | Box 141 \ 3 scan0239 | |
| Testing and modifications for bifurcated rivets, brakes, and clutch components. | 21th Dec 1933 | Box 141 \ 3 scan0240 | |
| Letter to Ferodo Limited regarding excessive wear of clutch liners on the Bentley chassis and a request for new lining suggestions. | 2nd Jan 1934 | Box 141 \ 3 scan0241 | |
| Standardisation of parts for bifurcated rivetting of brake linings. | 1st Jan 1934 | Box 141 \ 3 scan0242 | |
| Telegram to Ferodo Ltd. requesting a dozen RAD-5 friction discs. | 20th Jan 1934 | Box 141 \ 3 scan0243 | |
| Instructing the change of lining materials for servos, clutches, and brakes on Phantom and 20/25 HP cars. | 23th Jan 1934 | Box 141 \ 3 scan0244 | |
| Letter from Ferodo Limited discussing test results for brake servo motor linings. | 26th Jan 1934 | Box 141 \ 3 scan0245 | |
| Performance data sheet for various friction materials from Ferodo Limited. | 29th Jan 1934 | Box 141 \ 3 scan0246 | |
| Request for an opinion on 'E' quality Chekko brake liners being tested. | 29th Jan 1934 | Box 141 \ 3 scan0247 | |
| Inquiry about using AMR2 brake lining on the B2 series and its potential to cause similar issues found on Bentley brakes. | 29th Jan 1934 | Box 141 \ 3 scan0248 | |
| Letter to Ferodo Limited discussing servo motor performance and friction values. | 30th Jan 1934 | Box 141 \ 3 scan0249 | |
| Requesting a reply regarding the brake lining on the 20/25 HP model. | 5th Feb 1934 | Box 141 \ 3 scan0250 | |
| Letter to Ferodo Limited regarding tests on the heat treatment and wear of clutch fabrics. | 13th Feb 1934 | Box 141 \ 3 scan0251 | |
| Letter discussing clutch troubles, specifically slipping, smoke, judder and rapid wear of linings. | 13th Feb 1934 | Box 141 \ 3 scan0252 | |
| Clutch lining tests for a Bentley, detailing the method and results. | 13th Feb 1934 | Box 141 \ 3 scan0253 | |
| Test results table for various linings, detailing wear and performance under different temperature and slip conditions. | 2nd Feb 1934 | Box 141 \ 3 scan0254 | |
| Letter from Ferodo Limited about discrepancies in servo motor friction material test values, including a data table. | 2nd Feb 1934 | Box 141 \ 3 scan0255 | |
| Letter from Ferodo Limited acknowledging a query about the heat treatment of clutch fabrics. | 14th Feb 1934 | Box 141 \ 3 scan0256 | |
| Letter from Ferodo Limited regarding the heat treatment and trial of clutch discs. | 16th Feb 1934 | Box 141 \ 3 scan0257 | |
| Letter from Ferodo Limited confirming the despatch of two sets of Ferobestos front liners for a Bentley model. | 24th Feb 1934 | Box 141 \ 3 scan0258 | |
| Untraceable shipment of Ferodo Discs against a purchase order. | 27th Feb 1934 | Box 141 \ 3 scan0259 | |
| Confirming receipt of four G. 81042 Ferodo Discs and requesting them to be booked in. | 1st Mar 1934 | Box 141 \ 3 scan0260 | |
| Invoice from Ferodo Ltd. for liners sent without an official order. | 3rd Mar 1934 | Box 141 \ 3 scan0261 | |
| Request for a covering order to Ferodo Ltd. for Ferobestos Liners to be used for testing on a Bentley. | 8th Mar 1934 | Box 141 \ 3 scan0262 | |
| Notice regarding the new designation for chemically treated clutch linings. | 20th Mar 1934 | Box 141 \ 3 scan0263 | |
| Test results for a chemically treated Bentley clutch lining, RAD.11, by Ferodos. | 27th Feb 1934 | Box 141 \ 3 scan0264 | |
| Order for four sets of Bentley brake linings from Ferodos. | 20th Apr 1934 | Box 141 \ 3 scan0265 | |
| Unsatisfactory quality of rivetting on brake straps for experimental chassis. | 21th Apr 1934 | Box 141 \ 3 scan0266 | |
| Request to the Order Office to place an order with Ferodo for 20/25 Clutch Linings. | 26th Apr 1934 | Box 141 \ 3 scan0267 | |
| Requesting to book in 12 clutch linings collected from Ferodo Ltd. | 17th May 1934 | Box 141 \ 3 scan0268 | |
| Confirming a telephone order to Ferodo for clutch and Bentley brake linings. | 8th Jun 1934 | Box 141 \ 3 scan0269 | |
| Letter from Ferodo Limited regarding brake lining tests, coefficients of friction, and an order for brake and clutch discs. | 9th Jun 1934 | Box 141 \ 3 scan0270 | |
| Letter from Ferodo Limited regarding the submission of samples for trial. | 29th Oct 1931 | Box 141 \ 3 scan0271 | |
| Chart showing the performance characteristics of various materials tested on a Nitralloy drum. | 29th Oct 1931 | Box 141 \ 3 scan0272 | |
| Letter from Small & Parkes Ltd. discussing the merits of using cork inserts in clutch discs. | 11th Jun 1934 | Box 141 \ 3 scan0273 | |
| Page two of a letter from Small & Parkes Ltd. regarding the wear life of corks and fabric in discs. | 11th Jun 1934 | Box 141 \ 3 scan0274 | |
| Requesting an order of Bentley foot brake linings from Ferodos for direct delivery to Cricklewood. | 16th Jun 1934 | Box 141 \ 3 scan0275 | |
| Letter from Ferodo Limited confirming a meeting to present further brake lining samples and a performance meter. | 19th Jun 1934 | Box 141 \ 3 scan0276 | |
| Letter from Ferodo Limited concerning the dispatch of brake and servo motor discs and linings. | 21th Jun 1934 | Box 141 \ 3 scan0277 | |
| Letter to Ferodo Limited requesting to amend Order No. 65884 to increase the quantity of brake lining sets from 6 to 12. | 22th Jun 1934 | Box 141 \ 3 scan0278 | |
| Delay in the despatch of new brake linings from Messrs. Ferodo. | 22th Jun 1934 | Box 141 \ 3 scan0279 | |
| Request to increase an order for Bentley brake linings from 6 to 12 sets. | 22th Jun 1934 | Box 141 \ 3 scan0280 | |
| Letter to Ferodo Ltd. requesting a change in the delivery address for two batches of brake linings. | 25th Jun 1934 | Box 141 \ 3 scan0281 | |
| Letter from Ferodo Limited confirming an increase in the quantity of brake linings for order number 65834. | 25th Jun 1934 | Box 141 \ 3 scan0282 | |
| Letter from Ferodo Limited acknowledging receipt of instructions for an order of FB/4A lining. | 26th Jun 1934 | Box 141 \ 3 scan0283 | |
| Letter to Ferodo Limited providing feedback on a loaned brake indicator and associated braking test results. | 27th Jun 1934 | Box 141 \ 3 scan0284 | |
| Letter from Ferodo Limited confirming the dispatch of experimental B.Z. liners. | 29th Jun 1934 | Box 141 \ 3 scan0285 | |
| Letter to Ferodo Limited regarding test results on servo linings and requesting alternatives. | 12th Jul 1934 | Box 141 \ 3 scan0286 | |
| Letter to British Belting & Asbestos Ltd. regarding tests on servo linings and requesting new samples. | 12th Jul 1934 | Box 141 \ 3 scan0287 | |
| Letter from British Belting & Asbestos Ltd regarding servo linings for Piece No. G.56065. | 13th Jul 1934 | Box 141 \ 3 scan0288 | |
| Letter from Ferodo Limited regarding a delay in supplying Servo motor discs and the heat treatment of RAD.13 discs. | 19th Jul 1934 | Box 141 \ 3 scan0289 | |
| Letter from Ferodo Limited regarding the trial of eight servo motor moulded discs, noting potential structural weakness and the main interest in temperature effects on friction. | 23th Jul 1934 | Box 141 \ 3 scan0290 | |
| Letter to Ferodo Limited detailing the poor performance, excessive wear, and squealing of trial servo motor linings. | 30th Jul 1934 | Box 141 \ 3 scan0291 | |
| Letter detailing issues with abnormal wear, dust, and squealing in servo motor linings. | 30th Jul 1934 | Box 141 \ 3 scan0292 | |
| Letter from Ferodo Limited regarding unsatisfactory special linings, reference S.4419, for a servo motor. | 2nd Aug 1934 | Box 141 \ 3 scan0293 | |
| Concerning an invoice from Ferodo Ltd. for Ferobestos Flat Liners. | 4th Aug 1934 | Box 141 \ 3 scan0294 | |
| Letter to a supplier requesting a further supply of 'Mintex Lamina' servo linings for experimental purposes. | 8th Aug 1934 | Box 141 \ 3 scan0295 | |
| Letter confirming a supply of 'Mintex' 'Lamina' servo linings for experimental purposes. | 10th Aug 1934 | Box 141 \ 3 scan0296 | |
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