| Description | Date | Identifier | |
| Letter from Clayton Dewandre Company Limited arranging a meeting to discuss car heating. | 13th Nov 1937 | Box 137 \ 1 scan0301 | |
| Letter to John Marston Ltd. regarding car heaters, oil coolers, and reconditioned matrices. | 14th Jul 1937 | Box 137 \ 1 scan0302 | |
| Comparison of Harrison and Marston 4 plate Viscon coolers based on heat dissipation and oil pressure drop. | 16th Nov 1937 | Box 137 \ 1 scan0303 | |
| Requesting arrangements to fit a Clayton Dewandre car heater to car B.117.JY. | 16th Nov 1937 | Box 137 \ 1 scan0304 | |
| Parts list for car heater connections for Bentley. | 17th Nov 1937 | Box 137 \ 1 scan0305 | |
| Request to modify a car heater scheme to incorporate a defrosting blower. | 17th Nov 1937 | Box 137 \ 1 scan0306 | |
| Tests conducted on various car heaters and defrosters for de-icing layout information. | 17th Nov 1937 | Box 137 \ 1 scan0307 | |
| Performance test data for various car heater and de-icer units. | 17th Nov 1937 | Box 137 \ 1 scan0308 | |
| Conclusions on average car heater fan speeds and a proposed heater and de-icer design. | 17th Nov 1937 | Box 137 \ 1 scan0309 | |
| Urgent order for two Clayton Dewandre car heaters. | 18th Nov 1937 | Box 137 \ 1 scan0310 | |
| The decision to fit a Buick heater and defroster to car 26.G.V1 instead of 32-EX. | 18th Nov 1937 | Box 137 \ 1 scan0311 | |
| Letter regarding a new patented car heater system. | 22th Nov 1939 | Box 137 \ 1 scan0312 | |
| Sales letter from the Sales Manager offering a practical demonstration of a new car. | 22th Nov 1937 | Box 137 \ 1 scan0313 | |
| Instruction to fit a Clayton Dewandre car heater to a 28.G.VI. car. | 22th Nov 1937 | Box 137 \ 1 scan0314 | |
| Requesting a car heater be connected with hose instead of metal piping to test for noise transmission. | 25th Nov 1937 | Box 137 \ 1 scan0315 | |
| The fitment of a Clayton car heater to car 27.G.VI. | 26th Nov 1937 | Box 137 \ 1 scan0316 | |
| Quotation from Clayton Dewandre Company Limited for two types of heater units. | 26th Nov 1937 | Box 137 \ 1 scan0317 | |
| Letter responding to an enquiry about car heaters and requesting a patent specification. | 27th Nov 1937 | Box 137 \ 1 scan0318 | |
| Letter to Clayton Dewandre Co. Ltd. regarding quotations and faults with car heaters. | 29th Nov 1937 | Box 137 \ 1 scan0319 | |
| Letter from Clayton Dewandre Co. Ltd. regarding complaints and a quotation for a combined heater/de-froster. | 30th Nov 1937 | Box 137 \ 1 scan0320 | |
| Letter from Clayton Dewandre Co. Ltd. requesting the return of a sample Car Heater and Defrosting device for modifications. | 30th Nov 1937 | Box 137 \ 1 scan0321 | |
| The despatch of a combined car heater and defroster to Clayton Dewandre Ltd. | 2nd Dec 1937 | Box 137 \ 1 scan0322 | |
| Letter to Clayton Dewandre Co. Ltd. regarding the dispatch of a car heater and defroster, and a request for test figures. | 2nd Dec 1937 | Box 137 \ 1 scan0323 | |
| Clayton Heaters, suggesting they should be made to switch off with the ignition. | 13th Dec 1937 | Box 137 \ 1 scan0324 | |
| Seeking an opinion on Harrison car heaters as a potential replacement for Clayton heaters in the Standardised Phantom III Pullman. | 13th Dec 1937 | Box 137 \ 1 scan0325 | |
| The return of two car heaters to Messrs. John Marston Ltd. | 14th Dec 1937 | Box 137 \ 1 scan0326 | |
| Criticisms of the Harrison car heater compared to the Clayton model. | 15th Dec 1937 | Box 137 \ 1 scan0327 | |
| Comparing the installation and performance of Harrison and Clayton car heaters. | 15th Dec 1937 | Box 137 \ 1 scan0328 | |
| Comparison table of characteristics for four different heater types. | 15th Dec 1937 | Box 137 \ 1 scan0329 | |
| Sketch showing alternative installations for Harrison and Clayton heaters. | 15th Dec 1937 | Box 137 \ 1 scan0330 | |
| Letter to a supplier regarding issues with a faulty heater switch and poor heater performance. | 15th Dec 1937 | Box 137 \ 1 scan0331 | |
| Page 2 of a letter to Clayton Dewandre Ltd. regarding heater output. | 15th Dec 1937 | Box 137 \ 1 scan0332 | |
| Letter to S. Smith & Sons Ltd. regarding car heating schemes and a quotation for thermostat assemblies. | 17th Dec 1937 | Box 137 \ 1 scan0333 | |
| Letter from Clayton Dewandre Co. Ltd. regarding the dispatch of a 'CC' type heater, blueprints, and further testing. | 20th Dec 1937 | Box 137 \ 1 scan0334 | |
| Letter confirming instructions to send an S.2.CA.Heater for the Chief Engineer's Bentley car. | 21th Dec 1937 | Box 137 \ 1 scan0335 | |
| Confirming the decision to use 'Clayton' C.C. model car heaters. | 21th Dec 1937 | Box 137 \ 1 scan0336 | |
| Requesting the preparation of parts to fit a Clayton Dewandre car heater to car B.69.EY. | 21th Dec 1937 | Box 137 \ 1 scan0337 | |
| Letter from S. Smith & Sons regarding car heating schemes and a quotation for thermostats. | 21th Dec 1937 | Box 137 \ 1 scan0338 | |
| Instruction to replace a faulty car heater switch and rheostat for car 28.G.VI. | 23th Dec 1937 | Box 137 \ 1 scan0339 | |
| Letter from Clayton Dewandre Co. Ltd. concerning a faulty heater and providing rheostat test data. | 28th Dec 1937 | Box 137 \ 1 scan0340 | |
| Requesting the production of parts for a car heater being developed by John Marstons for cold weather testing. | 4th Jan 1938 | Box 137 \ 2 scan0001 | |
| Parts list and production request for a Bentley III car heater and de-froster. | 4th Jan 1938 | Box 137 \ 2 scan0002 | |
| Despatch and assembly of a 12-volt motor and 4-blade axial fan unit. | 4th Jan 1938 | Box 137 \ 2 scan0003 | |
| Return of a faulty car heater switch to the supplier, Messrs. Clayton Dewandre. | 4th Jan 1938 | Box 137 \ 2 scan0004 | |
| Requesting provision for a car heater during the redesign of the Wraith dashboard layout. | 8th Jan 1938 | Box 137 \ 2 scan0005 | |
| Letter from S. Smith & Sons (Motor Accessories) Ltd regarding a new heating and de-frosting unit. | 13th Jan 1938 | Box 137 \ 2 scan0006 | |
| Modifications to the controlling rheostat and brush load on specific car heaters. | 19th Jan 1938 | Box 137 \ 2 scan0007 | |
| Instruction to remove an existing car heater and switch, and refit a new supplied set. | 20th Jan 1938 | Box 137 \ 2 scan0008 | |
| Letter to Clayton Dewandre Ltd. concerning issues with car heaters, including the return of a 'CC' type heater and complaints about experimental models. | 20th Jan 1938 | Box 137 \ 2 scan0009 | |
| Letter discussing a fault with a heater's rheostat and its return for inspection. | 20th Jan 1938 | Box 137 \ 2 scan0010 | |
| Return of a faulty Clayton 'CC' type car heater and switch to the supplier, Clayton Dewandre. | 21th Jan 1938 | Box 137 \ 2 scan0011 | |
| Request to redesign noisy bearings and a blower fan for an experimental car heater. | 3rd Feb 1938 | Box 137 \ 2 scan0012 | |
| Official order for a second car heater from Marstons Ltd. | 5th Feb 1938 | Box 137 \ 2 scan0013 | |
| Request to detail an adaptor for a car heater driving motor to connect with a flexible drive. | 7th Feb 1938 | Box 137 \ 2 scan0014 | |
| Noisy fan bearings on a car heater for the B.III and other chassis. | 7th Feb 1938 | Box 137 \ 2 scan0015 | |
| Defects with a car heater for the B.III and other chassis, requesting modifications. | 7th Feb 1938 | Box 137 \ 2 scan0016 | |
| Letter from Clayton Dewandre Co. Ltd. discussing tests on a 'C.C' heater and motor difficulties. | 7th Feb 1938 | Box 137 \ 2 scan0017 | |
| From the research department reporting on a test of a C.C. type car heater and rheostat. | 7th Feb 1938 | Box 137 \ 2 scan0018 | |
| Test of C.C. type car heater NO.A.75 and Rheostat CT.776/2. | 7th Feb 1938 | Box 137 \ 2 scan0019 | |
| From the Research Department showing tabulated electrical test results. | 7th Feb 1938 | Box 137 \ 2 scan0020 | |
| Test memorandum for a C.C. type car heater No. A.75 and rheostat CT.776/2. | 7th Feb 1938 | Box 137 \ 2 scan0021 | |
| Performance test results for a heater control switch from the British Thermostat Co. | 22th Dec 1937 | Box 137 \ 2 scan0022 | |
| Instruction to issue two blueprints for new drawings related to the Wraith III car heater and defroster spindle. | 8th Feb 1938 | Box 137 \ 2 scan0023 | |
| Letter to The British Thermostat Co. Ltd. requesting a rheostat and switch for a sample car heater. | 8th Feb 1938 | Box 137 \ 2 scan0024 | |
| Production of Bakelite bushes and spindles for a car heater. | 9th Feb 1938 | Box 137 \ 2 scan0025 | |
| Confirming that a car heater, de-froster, and fan belts are supplied free of charge, making a covering order unnecessary. | 9th Feb 1938 | Box 137 \ 2 scan0026 | |
| Letter from The British Thermostat Co. Ltd. regarding the supply of a suitable Rheostat for a Heater Motor. | 10th Feb 1938 | Box 137 \ 2 scan0027 | |
| Blueprints and parts for the Wraith car heater and defroster. | 10th Feb 1938 | Box 137 \ 2 scan0028 | |
| Instructions for the dismantling, repair, and modification of a B.III car heater. | 11th Feb 1938 | Box 137 \ 2 scan0029 | |
| Letter to a supplier regarding the failure of a thermostat unit used on production Bentley cars. | 11th Feb 1938 | Box 137 \ 2 scan0030 | |
| Letter discussing the length of bellows and the position of a valve, requesting remarks on the subject. | 11th Feb 1938 | Box 137 \ 2 scan0031 | |
| Letter from S. Smith & Sons regarding a sample Car Heater and De-Mister. | 14th Feb 1938 | Box 137 \ 2 scan0032 | |
| Request to send an official order to The British Thermostat Co. Ltd. for three car heater control rheostats. | 12th Feb 1938 | Box 137 \ 2 scan0033 | |
| Request to a supplier for a sample of flexible un-braided canvas hose for car heater and defroster connections. | 26th Feb 1938 | Box 137 \ 2 scan0034 | |
| Modifications and parts required for the Bentley III car heater and de-froster. | 14th Feb 1938 | Box 137 \ 2 scan0035 | |
| Request to make one set of parts for a B.III Car Heater and De-Froster for testing purposes. | 15th Feb 1938 | Box 137 \ 2 scan0036 | |
| The factory costs for specific parts for a car heater and defroster. | 21th Feb 1938 | Box 137 \ 2 scan0037 | |
| Sourcing and modification of B.III hubs, including issues with fouling and the need for new drawings. | 24th Feb 1938 | Box 137 \ 2 scan0038 | |
| Letter from a supplier confirming they will submit a sample of flexible canvas hose for approval. | 28th Feb 1938 | Box 137 \ 2 scan0039 | |
| The performance of Bakelite car heater bushes and a request for modifications to the defroster system. | 2nd Mar 1938 | Box 137 \ 2 scan0040 | |
| Request to assemble a second car heater bearing, with instructions on alternative materials. | 3rd Mar 1938 | Box 137 \ 2 scan0041 | |
| Letter from The Leyland & Birmingham Rubber Co Ltd regarding a sample of flexible canvas hose for car heater and defroster connections. | 3rd Mar 1938 | Box 137 \ 2 scan0042 | |
| Order of 15 ft. of rubber hose for car heaters. | 8th Mar 1938 | Box 137 \ 2 scan0043 | |
| Letter from The Leyland & Birmingham Rubber Co. Ltd. providing a quotation for Car Heater and Defroster Hose. | 5th Mar 1938 | Box 137 \ 2 scan0044 | |
| Halting the manufacture of bearing pieces for a car heater, as a cheaper alternative has been found. | 14th Mar 1938 | Box 137 \ 2 scan0045 | |
| Request to place an official order for flexible hose for car heaters and defrosters. | 15th Mar 1938 | Box 137 \ 2 scan0046 | |
| Letter regarding car heating and de-frosting, enclosing drawings ST.1535 and ST.1536 as an alternative to a requested Bosch set. | 22th Mar 1938 | Box 137 \ 2 scan0047 | |
| Returning a faulty car heater rheostat to the British Thermostat Co. Ltd. for repair. | 26th Mar 1938 | Box 137 \ 2 scan0048 | |
| Request for a more powerful motor for a car heater blower and a suitable mounting plate design. | 26th Mar 1938 | Box 137 \ 2 scan0049 | |
| Letter to a supplier requesting an official description and cost for a car heater motor. | 26th Mar 1938 | Box 137 \ 2 scan0050 | |
| Return of a car heater and demister outfit that was on loan. | 29th Mar 1938 | Box 137 \ 2 scan0051 | |
| Blueprints for fitting a larger car heater motor to the Wraith III. | 31th Mar 1938 | Box 137 \ 2 scan0052 | |
| Secret memo regarding the sourcing and negotiation for car heaters for the Standardised Six-light Limousine on the 25/30 Chassis. | 1st Apr 1938 | Box 137 \ 2 scan0053 | |
| Letter from Clayton Dewandre Co. Ltd. confirming their capability to produce and supply car heaters. | 4th Apr 1938 | Box 137 \ 2 scan0054 | |
| Letter from Clayton Dewandre Co. Ltd. confirming prices for rheostatic switches for car heaters. | 6th Apr 1938 | Box 137 \ 2 scan0055 | |
| Letter from S. Smith & Sons apologising for a delay in correspondence regarding heaters. | 5th Apr 1938 | Box 137 \ 2 scan0056 | |
| Letter to Mr. Grose of S.Smith & Sons offering condolences and discussing a car heater thermostat. | 6th Apr 1938 | Box 137 \ 2 scan0057 | |
| Quotations and recommendations for car heaters and associated components for the Wraith model. | 7th Apr 1938 | Box 137 \ 2 scan0058 | |
| Leaking car heaters, proposing a single Rotherham tap and instructions for coachbuilders. | 7th Apr 1938 | Box 137 \ 2 scan0059 | |
| Brief memo arranging a meeting to discuss information received about car heaters. | 13th Apr 1938 | Box 137 \ 2 scan0060 | |
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