| Description | Date | Identifier | |
| Letter to Leyland Motors inquiring about dry cylinder liners and discussing aluminium engine components. | 24th Aug 1938 | Box 140 \ 3 scan0222 | |
| Letter to V.W. Pilkington of Leyland Motors regarding information on the fitting of liners. | 16th Sep 1938 | Box 140 \ 3 scan0223 | |
| Letter from Leyland Motors discussing cracking issues with screwed-in valve seats in aluminium alloy cylinder heads. | 11th Nov 1938 | Box 140 \ 3 scan0224 | |
| Letter to Leyland Motors discussing Silichrome inlet valve seats, bearings, and engine filtration methods. | 12th Nov 1938 | Box 140 \ 3 scan0225 | |
| Extract from a report on American practices for fitting aero engine valve seats. | 27th Apr 1937 | Box 140 \ 3 scan0226 | |
| Drawing of an exhaust valve seat. | 14th Nov 1938 | Box 140 \ 3 scan0227 | |
| Blueprint for an Inlet Valve Seat. | 10th Dec 1937 | Box 140 \ 3 scan0228 | |
| Letter from Leyland Motors Ltd. to Rolls-Royce discussing valve inserts and cylinder head issues. | 22th Nov 1938 | Box 140 \ 3 scan0229 | |
| Continuation of a letter from Leyland Motors Limited regarding engine filter arrangements and bearing scratching issues. | 30th Nov 1938 | Box 140 \ 3 scan0230 | |
| Letter to Leyland Motors Ltd. detailing specifications for screwed-in inserts in aluminium cylinder heads. | 30th Nov 1938 | Box 140 \ 3 scan0231 | |
| Page two of a letter clarifying information on seat drawings and locking slot procedures. | 30th Nov 1938 | Box 140 \ 3 scan0232 | |
| Letter from Leyland Motors thanking for information on screwed-in inserts in aluminium cylinder heads. | 1st Dec 1938 | Box 140 \ 3 scan0233 | |
| Letter to Leyland Motors Ltd. requesting advice on the best method and instrument for measuring cylinder bore wear. | 20th Jan 1939 | Box 140 \ 3 scan0234 | |
| Letter to V.W. Pilkington of Leyland Motors confirming an arrival time at the Leyland Works. | 15th Feb 1939 | Box 140 \ 3 scan0235 | |
| Visit to Leyland to discuss the practicalities of diesel combustion chambers for the Rationalised Engine Project. | 17th Feb 1939 | Box 140 \ 3 scan0236 | |
| Engine design, including centrifugal blowers and crankshaft drive options, with comparisons to Bentley and Leyland engines. | 17th Feb 1939 | Box 140 \ 3 scan0237 | |
| Visit to Leyland Motors discussing marine and diesel engine design. | 17th Feb 1939 | Box 140 \ 3 scan0238 | |
| Engine design and performance, focusing on Leyland's experiences with C.I. engines, injector pumps, and crankshafts. | 17th Feb 1939 | Box 140 \ 3 scan0239 | |
| Letter from Leyland Motors Ltd. enclosing two service manuals for the Leyland Titan TD.5 chassis and the Light-Six Oil Engine. | 17th Feb 1939 | Box 140 \ 3 scan0240 | |
| Thank-you letter to V.W. Pilkington of Leyland Motors for providing manuals. | 20th Feb 1939 | Box 140 \ 3 scan0241 | |
| Cost and weight comparison between the Cub and Wraith engines. | 17th Mar 1939 | Box 140 \ 3 scan0242 | |
| Cost and weight analysis for Leyland and Wraith gearboxes. | 17th Mar 1939 | Box 140 \ 3 scan0243 | |
| Visit to Leyland Motors Ltd. regarding their use of dry liners for cylinder bores. | 3rd May 1939 | Box 140 \ 3 scan0244 | |
| Engine cylinder liner wear, comparing performance before and after fitting a dry liner in Leyland engines. | 3rd May 1939 | Box 140 \ 3 scan0245 | |
| Inquiry to Leyland Motors regarding the cost of fitting Phosphor Chrome dry liners to the 'Cub' engine. | 15th May 1939 | Box 140 \ 3 scan0246 | |
| Letter from Leyland Motors discussing a new combustion chamber design for C.I. engines. | 17th May 1939 | Box 140 \ 3 scan0247 | |
| Short memo confirming a meeting between Spurrier and Grimshaw to discuss nitriding. | 19th May 1939 | Box 140 \ 3 scan0248 | |
| Letter to Leyland Motors regarding engine components like pistons, nit-riding, and dry liners. | 1st Jun 1939 | Box 140 \ 3 scan0249 | |
| Letter from Leyland Motors detailing the manufacturing costs for a cylinder liner, part No. X.45889. | 5th Jun 1939 | Box 140 \ 3 scan0250 | |
| Operation sheet for the manufacturing of Cylinder Liners. | 4th Feb 1937 | Box 140 \ 3 scan0251 | |
| Operation sheet (Sheet 2) for the manufacturing process of a Cylinder Liner. | 8th Jan 1938 | Box 140 \ 3 scan0252 | |
| Letter from Leyland Motors discussing raised crown pistons, nitriding, and dry liner costs. | 21th Jun 1939 | Box 140 \ 3 scan0253 | |
| Letter to V.W. Pilkington of Leyland Motors arranging a visit to discuss raised crown pistons. | 22th Jun 1939 | Box 140 \ 3 scan0254 | |
| Letter from Leyland Motors to W. A. Robotham regarding piston test results and a confidential crankshaft report. | 18th Sep 1939 | Box 140 \ 3 scan0255 | |
| Letter from Leyland Motors Limited regarding interesting results obtained on web sections. | 20th Sep 1939 | Box 140 \ 3 scan0256 | |
| Letter to Leyland Motors discussing crankshafts, raised crown pistons, and their effect on compression ratios and detonation. | 20th Sep 1939 | Box 140 \ 3 scan0257 | |
| Cover letter to Leyland Motors enclosing a report on raised crown pistons. | 22th Sep 1939 | Box 140 \ 3 scan0258 | |
| Letter from Leyland Motors acknowledging a report on raised crown pistons and enclosing a report on tests with Wellworthy high compression pistons. | 23th Sep 1939 | Box 140 \ 3 scan0259 | |
| Letter to V.W. Pilkington of Leyland Motors regarding details of the AC.9 big end bearings which ran on the Phantom III. | 28th Sep 1939 | Box 140 \ 3 scan0260 | |
| Letter to V.W. Pilkington of Leyland Motors concerning a missing blueprint of a Phantom III big end bearing. | 13th Oct 1939 | Box 140 \ 3 scan0261 | |
| Letter from Leyland Motors regarding missing details for AC.9 big end bearings used on the Phantom III. | 16th Oct 1939 | Box 140 \ 3 scan0262 | |
| Letter from Leyland Motors returning a test report on an Aerolite raised crown piston. | 16th Oct 1939 | Box 140 \ 3 scan0263 | |
| Cover letter to V.W. Pilkington of Leyland Motors regarding a misunderstanding about a blueprint. | 18th Oct 1939 | Box 140 \ 3 scan0264 | |
| Letter from Leyland Motors Ltd. concerning a blueprint for connecting rods. | 24th Oct 1939 | Box 140 \ 3 scan0265 | |
| Letter to Leyland Motors asking for information on lubricating the 3rd speed driven gear. | 28th Nov 1939 | Box 140 \ 3 scan0266 | |
| Letter from Leyland Motors regarding gearbox modifications and issues with the third speed wheel. | 11th Dec 1939 | Box 140 \ 3 scan0267 | |
| Letter from Leyland Motors Limited discussing different methods of mounting gears in gearboxes, including the Spicer box. | 16th Dec 1939 | Box 140 \ 3 scan0268 | |
| Letter to Leyland Motors thanking them for information on mounting constant mesh gears and returning a Spicer drawing. | 16th Dec 1939 | Box 140 \ 3 scan0269 | |
| Letter from Leyland Motors regarding the inspection of a 6-cylinder aluminium cylinder block with dry liners after service testing. | 18th Dec 1939 | Box 140 \ 3 scan0270 | |
| Continuation of a letter from Leyland Motors regarding inspection of engine block liners. | 21th Dec 1939 | Box 140 \ 3 scan0271 | |
| Letter to Leyland Motors regarding the behaviour of their aluminium Cub engine and a request to see a spare block. | 21th Dec 1939 | Box 140 \ 3 scan0272 | |
| Letter from Leyland Motors regarding the testing and performance of a Cub engine in aluminium, with enclosed power curves. | 2nd Jan 1939 | Box 140 \ 3 scan0273 | |
| Letter from Leyland Motors Limited regarding a spare block for inspection. | 2nd Jan 1939 | Box 140 \ 3 scan0274 | |
| Letter from British Belting & Asbestos Ltd. regarding squeaking Halo III brake linings and the supply of Halo V linings for testing. | 10th May 1937 | Box 140 \ 4 scan0001 | |
| Order of Ferodo brake linings for experimental testing. | 13th May 1937 | Box 140 \ 4 scan0002 | |
| Internal memorandum requesting an urgent order for Ferodo brake linings. | 20th May 1937 | Box 140 \ 4 scan0003 | |
| Letter from Gandy's Brake Lining discussing test results and submission of new brake liner samples. | 24th May 1937 | Box 140 \ 4 scan0004 | |
| Confirming that two larger samples of Lead Powder for Brake Linings are being sent. | 7th Jun 1937 | Box 140 \ 4 scan0005 | |
| Urgent internal memo requesting an order of Ferodo brake linings for customers. | 7th Jun 1937 | Box 140 \ 4 scan0006 | |
| Letter to Messrs Ferodo Ltd. regarding the testing of special yarn and fabric for experimental car linings. | 19th Jun 1937 | Box 140 \ 4 scan0007 | |
| Persistent squeaking issue caused by a resinous substance on a drum. | 17th Jun 1937 | Box 140 \ 4 scan0008 | |
| Requesting an order for Ferodo brake linings for Phantom III and Wraith models. | 17th Jun 1937 | Box 140 \ 4 scan0009 | |
| Order for Ferodo brake linings for experimental purposes. | 22th Jun 1937 | Box 140 \ 4 scan0010 | |
| Billing discrepancy with Ferodo Ltd. over an order for five brake liners that were supposed to be free of charge. | 25th Jun 1937 | Box 140 \ 4 scan0011 | |
| Letter from Ferodo Ltd. regarding a disagreement over an invoice for the supply of 72 liners. | 24th Jun 1937 | Box 140 \ 4 scan0012 | |
| Acquisition and testing of Ferodo brake linings and justifying why they were obtained for free. | 28th Jun 1937 | Box 140 \ 4 scan0013 | |
| Letter concerning brake squeaking issues with test linings and the potential use of lubricants. | 28th Jun 1937 | Box 140 \ 4 scan0014 | |
| Page 2 of a letter to British Belting Co. regarding the composition and performance of brake linings, including lead content and squeaking issues. | 26th Mar 1937 | Box 140 \ 4 scan0015 | |
| Letter to Ferodo Limited concerning brake squeaks and a request for a sample of their bonding material for comparison. | 29th Jun 1937 | Box 140 \ 4 scan0016 | |
| Letter from British Belting & Asbestos Ltd. regarding the properties required in a brake lining to avoid squeaking. | 1st Jul 1937 | Box 140 \ 4 scan0017 | |
| Confirming pricing and shipping details for lead powder to be used in brake linings. | 2nd Jul 1937 | Box 140 \ 4 scan0018 | |
| The receipt of Ferodo brake linings and a request for payment. | 9th Jul 1937 | Box 140 \ 4 scan0019 | |
| Enquiry to General Plastics about 'Durez' Resin for use as a bonding agent in brake linings. | 12th Jul 1937 | Box 140 \ 4 scan0020 | |
| Urgent internal memo requesting an order for Ferodo brake linings. | 14th Jul 1937 | Box 140 \ 4 scan0021 | |
| Order of Ferodo brake linings for customer complaint cases. | 14th Jul 1937 | Box 140 \ 4 scan0022 | |
| Letter to Bendix Products Corporation regarding issues with brake lining glazing and squeaks. | 14th Jul 1937 | Box 140 \ 4 scan0023 | |
| The order of Ferodo brake linings for testing. | 29th Jul 1937 | Box 140 \ 4 scan0024 | |
| Requesting an order for Ferodo brake linings. | 2nd Aug 1937 | Box 140 \ 4 scan0025 | |
| Letter to Thermoid Ltd. in New Jersey, U.S.A. regarding testing, pricing, and specifications for their brake linings. | 4th Aug 1937 | Box 140 \ 4 scan0026 | |
| Letter to General Plastics Inc. acknowledging the arrival of a one-gallon sample of liquid resin for testing. | 6th Aug 1937 | Box 140 \ 4 scan0027 | |
| Letter from Gandy's Brake Lining arranging a meeting to discuss Bentley Brakes. | 7th Aug 1937 | Box 140 \ 4 scan0028 | |
| Letter to Messrs Gandy's Brake Lining arranging a meeting at Derby. | 9th Aug 1937 | Box 140 \ 4 scan0029 | |
| Instructing to fit brake linings intended for model 24.G.V1 onto model 29.G.V1 to save work. | 10th Aug 1937 | Box 140 \ 4 scan0030 | |
| Letter from British Belting & Asbestos Ltd. regarding the development and testing of a 'Halo III' brake lining. | 13th Aug 1937 | Box 140 \ 4 scan0031 | |
| Letter from British Belting & Asbestos Ltd. regarding the surprisingly high coefficient of friction in 'Halo III' shoes. | 14th Aug 1937 | Box 140 \ 4 scan0032 | |
| Letter to Gandy's Brake Linings Ltd. regarding the supply and testing of brake linings. | 17th Aug 1937 | Box 140 \ 4 scan0033 | |
| The return of defective Ferodo R.L.2 brake linings for a Wraith. | 17th Aug 1937 | Box 140 \ 4 scan0034 | |
| Letter to Messrs Ferodo Ltd. regarding the return of defective R.L.2. parts which split upon bending. | 17th Aug 1937 | Box 140 \ 4 scan0035 | |
| Letter to British Belting & Asbestos Ltd. regarding the testing and ordering of 'halo III' material pieces. | 19th Aug 1937 | Box 140 \ 4 scan0036 | |
| The return of 'Halo' brake linings for testing. | 19th Aug 1937 | Box 140 \ 4 scan0037 | |
| Letter from a supplier confirming receipt of an order for linings and advising of a holiday closure. | 20th Aug 1937 | Box 140 \ 4 scan0038 | |
| Letter from Gandy's Brake Lining regarding the supply and testing of new graphited brake lining material. | 21th Aug 1937 | Box 140 \ 4 scan0039 | |
| Letter from Gandy's discussing the causes and theories of squeaking in 'Safeguard' brake linings. | 21th Aug 1937 | Box 140 \ 4 scan0040 | |
| Letter from Gandy's regarding 'Safeguard' brake lining and solutions to brake squeaking. | 21th Aug 1937 | Box 140 \ 4 scan0041 | |
| Letter from Ferodo Limited acknowledging a complaint about unsatisfactory liners supplied against order No.45136. | 21th Aug 1937 | Box 140 \ 4 scan0042 | |
| Order for Halo brake linings from The British Belting & Asbestos Co. | 23th Aug 1937 | Box 140 \ 4 scan0043 | |
| Urgent order for Ferodo brake linings. | 23th Aug 1937 | Box 140 \ 4 scan0044 | |
| Letter from the Thermoid Company regarding a request for brake lining samples and blueprints. | 23th Aug 1937 | Box 140 \ 4 scan0045 | |
| Letter from Thermoid regarding the supply and specifications of brake lining samples. | 23th Aug 1937 | Box 140 \ 4 scan0046 | |
| Letter to Messrs Gandy's regarding brake lining test pieces and servo-induced squeaks. | 23th Aug 1937 | Box 140 \ 4 scan0047 | |
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