| Description | Date | Identifier | |
| Letter to Serck Radiators Ltd. regarding omitted prints for a bottom tank, top tank and matrix top plate. | 13th May 1938 | Box 150 \ 2 scan0020 | |
| Letter to John Marston Ltd. confirming an order for Bentley radiators and detailing associated drawings. | 14th May 1938 | Box 150 \ 2 scan0021 | |
| Letter to John Marston Ltd. regarding radiator shell design, bracing, finish, and the dispatch of Bentley badges. | 14th May 1938 | Box 150 \ 2 scan0022 | |
| Letter from Spaulding's regarding the supply of rubber washer samples for part number EW.1666. | 16th May 1938 | Box 150 \ 2 scan0023 | |
| Estimate from Spauldings Ltd for the supply of rubber washers. | 16th May 1938 | Box 150 \ 2 scan0024 | |
| Letter from a rubber manufacturer confirming the production of a curved hose connection part. | 16th May 1938 | Box 150 \ 2 scan0025 | |
| Letter from John Marston Ltd. regarding Bentley III and Bentley 50 radiators, and requesting a sample of matt paint. | 16th May 1938 | Box 150 \ 2 scan0026 | |
| Drawings for revised B.3 and B.50 radiators. | 16th May 1938 | Box 150 \ 2 scan0027 | |
| Revised radiators for models B.3 and B.50, discussing design changes and interchangeability. | 12th May 1938 | Box 150 \ 2 scan0028 | |
| Instruction to Messrs. Marstons for the construction of three radiators with associated costs. | 17th May 1938 | Box 150 \ 2 scan0029 | |
| Letter from Serck Radiators Limited regarding a sample handmade matrix sent for testing. | 18th May 1938 | Box 150 \ 2 scan0030 | |
| Handover of radiator filler parts to the Experimental Department for use on specific chassis. | 19th May 1938 | Box 150 \ 2 scan0031 | |
| Letter from a supplier discussing pricing and production costs for a curved hose connection part. | 20th May 1938 | Box 150 \ 2 scan0032 | |
| Letter to a supplier regarding a quotation and order for experimental hose connections. | 23th May 1938 | Box 150 \ 2 scan0033 | |
| Letter to Clayton Dewandre Ltd. requesting comparative testing of a new Sercks radiator matrix. | 24th May 1938 | Box 150 \ 2 scan0034 | |
| Letter to John Marston Ltd. concerning the failure of an 'F' type oil cooler and suggesting changes to the manufacturing process. | 24th May 1938 | Box 150 \ 2 scan0035 | |
| Letter regarding the build of a B.III radiator, pending tests on a new Serck matrix, with a list of associated part drawings. | 24th May 1938 | Box 150 \ 2 scan0036 | |
| Letter from The Leyland & Birmingham Rubber Co Ltd regarding a quotation and sample for a hose connection. | 24th May 1938 | Box 150 \ 2 scan0037 | |
| Works Order for the repair of a Mark VI Matrix with top and bottom tanks for stock. | 25th May 1938 | Box 150 \ 2 scan0038 | |
| The forwarding of specific parts to Messrs. John Marston Ltd. | 25th May 1938 | Box 150 \ 2 scan0039 | |
| Letter from Clayton Dewandre Co. Ltd. regarding the testing of a Serck matrix and the development of a 'Still' tube. | 25th May 1938 | Box 150 \ 2 scan0040 | |
| Confirming receipt of an invoice for a hose and requesting instructions for payment. | 25th May 1938 | Box 150 \ 2 scan0041 | |
| Letter from John Marston Ltd. regarding an oil cooler failure and radiator development for Bentley models. | 25th May 1938 | Box 150 \ 2 scan0042 | |
| Letter to Messrs. John Marstons Ltd. arranging a visit to inspect Bentley 50 radiator pieces and a failed oil cooler. | 27th May 1938 | Box 150 \ 2 scan0043 | |
| Letter from John Marston Limited returning a paper on Automobile Cooling. | 27th May 1938 | Box 150 \ 2 scan0044 | |
| Follow-up memo regarding an outstanding invoice from John Marston Ltd. for payment clearance. | 27th May 1938 | Box 150 \ 2 scan0045 | |
| Letter from The Leyland & Birmingham Rubber Co. Ltd confirming a sample of part number E.B.3848 will be posted for approval. | 27th May 1938 | Box 150 \ 2 scan0046 | |
| Official order for corrugated suction hose from Leyland & Birmingham Rubber Co. Ltd. | 28th May 1938 | Box 150 \ 2 scan0047 | |
| Letter from Clayton Dewandre Co. Ltd. returning a paper on automobile cooling. | 30th May 1938 | Box 150 \ 2 scan0048 | |
| Letter to John Marston Ltd. regarding the inspection of a Bentley 50 radiator and enclosing drawing PD.183. | 31th May 1938 | Box 150 \ 2 scan0049 | |
| Letter to John Marston Ltd. regarding work on Bentley II, III, and 50 radiator shells. | 3rd Jun 1938 | Box 150 \ 2 scan0050 | |
| Letter to John Marston Ltd. regarding a revised drawing for yoke stiffening on Bentley radiators. | 9th Jun 1938 | Box 150 \ 2 scan0051 | |
| Letter to John Marstons Ltd. regarding the completion date and quotation for Bentley radiators. | 10th Jun 1938 | Box 150 \ 2 scan0052 | |
| Request to send an official order to Ellison Insulations Ltd. for Tufnol 'Whale' material. | 15th Jun 1938 | Box 150 \ 2 scan0053 | |
| Letter to John Marstons Ltd. concerning points of discussion, dummy shutters, oil coolers, and radiator charges. | 14th Jun 1938 | Box 150 \ 2 scan0054 | |
| Letter discussing manufacturing issues with 'F' type coolers and proposing process changes. | 14th Jun 1938 | Box 150 \ 2 scan0055 | |
| Revised design of the radiator shell for B.3 and B.50 models. | 16th Jun 1938 | Box 150 \ 2 scan0056 | |
| Letter to Clayton Dewandre Co. Ltd. regarding the testing of a Bentley radiator matrix unit. | 17th Jun 1938 | Box 150 \ 2 scan0057 | |
| Letter from John Marston Limited responding to points raised regarding dummy shutters, an oil cooler, and a Bentley II Radiator. | 17th Jun 1938 | Box 150 \ 2 scan0058 | |
| Flexible radiator shell and the proposal of a suitable bridge piece as a fix. | 18th Jun 1938 | Box 150 \ 2 scan0059 | |
| Letter to John Marston Ltd. confirming a meeting to discuss building modified oil coolers and a Bentley III radiator. | 22th Jun 1938 | Box 150 \ 2 scan0060 | |
| Letter to John Marston Ltd. regarding a revised blueprint for a Bentley dummy shutter set. | 29th Jun 1938 | Box 150 \ 2 scan0061 | |
| Seeking approval to pay an invoice from J. Marston Ltd. for £21/4/9d and allocate it to order 46794. | 29th Jun 1938 | Box 150 \ 2 scan0062 | |
| Performance chart and specification for a Serck radiator matrix. | 28th Jun 1938 | Box 150 \ 2 scan0063 | |
| Performance graph and specifications for a Serck radiator matrix. | 28th Jun 1938 | Box 150 \ 2 scan0064 | |
| Comparative analysis of a Gallay 3 Row Radiator and a Serck 4 row Staggered Matrix. | 29th Jun 1938 | Box 150 \ 2 scan0065 | |
| Letter from Clayton Dewandre Co. Ltd. enclosing charts and a comparison table for a new cooling block. | 29th Jun 1938 | Box 150 \ 2 scan0066 | |
| Confirming an agreement with Messrs. Marstons to share the cost of an experimental sample radiator. | 2nd Jun 1938 | Box 150 \ 2 scan0067 | |
| Letter to Clayton Dewandre Ltd. comparing the performance of different radiator core designs. | 4th Jul 1938 | Box 150 \ 2 scan0068 | |
| Comparison and conclusion on Serck, Marston, and Harrison cores based on performance metrics. | 4th Jul 1938 | Box 150 \ 2 scan0069 | |
| Comparison table of heat dissipation for different matrices. | 4th Jul 1938 | Box 150 \ 2 scan0070 | |
| Order for 12 feet of de-froster hose. | 4th Jul 1938 | Box 150 \ 2 scan0071 | |
| Request for 12 feet of corrugated flexible hose from the Experimental Department to a rubber company. | 4th Jul 1938 | Box 150 \ 2 scan0072 | |
| Letter from The Leyland & Birmingham Rubber Co. Ltd confirming an order for 12 feet of corrugated flexible hose. | 5th Jul 1938 | Box 150 \ 2 scan0073 | |
| Letter from Clayton Dewandre to the Experimental Department regarding the pressure drop for performance comparisons. | 6th Jul 1938 | Box 150 \ 2 scan0074 | |
| Agreement for a tool alteration with John Marston Ltd. | 6th Jul 1938 | Box 150 \ 2 scan0075 | |
| Letter to John Marston Ltd. confirming modifications to drill jigs for Bentley II dummy shutter sets. | 7th Jul 1938 | Box 150 \ 2 scan0076 | |
| Order for two Firestone Rubber Mounting Blocks with specified hardness. | 7th Jul 1938 | Box 150 \ 2 scan0077 | |
| Promotional letter from Serck Radiators Limited regarding their new catalogue for Drum Type Oil Coolers. | 1st Jul 1938 | Box 150 \ 2 scan0078 | |
| Letter to Serck Radiators Ltd. regarding test results of their matrix block compared to the Marston Mk.VI. | 15th Jul 1938 | Box 150 \ 2 scan0079 | |
| Letter to a supplier regarding fitting issues and defects on Bentley III and Bentley 50 experimental radiators. | 15th Jul 1938 | Box 150 \ 2 scan0080 | |
| Letter to supplier J. Marston Ltd. regarding updates to Bentley radiator designs, quotations, and oil coolers. | 15th Jul 1933 | Box 150 \ 2 scan0081 | |
| Correspondence from Serck Radiators regarding the performance of an experimental matrix and quoting for a Bentley radiator. | 20th Jul 1938 | Box 150 \ 2 scan0082 | |
| Letter to Serck Radiators Ltd. concerning the re-testing of a radiator block and the retention of a previously supplied one. | 9th Aug 1938 | Box 150 \ 2 scan0083 | |
| Secret memorandum discussing the design and appearance of radiators for models B.III and B.50. | 20th Aug 1938 | Box 150 \ 2 scan0084 | |
| Letter from Serck Radiators requesting particulars of the 'Marston Mark VI' block for a weight analysis. | 22th Aug 1938 | Box 150 \ 2 scan0085 | |
| Design and production of a front apron for models B.III and B.50. | 29th Aug 1938 | Box 150 \ 2 scan0086 | |
| Return of two rubber hose water connections for examination and scrap. | 5th Sep 1938 | Box 150 \ 2 scan0087 | |
| Letter to The Leyland & Birmingham Rubber Co. Ltd. regarding the deterioration of two rubber hose connections after vehicle testing. | 5th Sep 1938 | Box 150 \ 2 scan0088 | |
| Letter from a supplier regarding failed rubber hose connections. | 6th Sep 1938 | Box 150 \ 2 scan0089 | |
| Letter to Serck Radiators Ltd. apologising for a delay and requesting clarification on an inquiry about a Marston Mk.VI block. | 8th Sep 1938 | Box 150 \ 2 scan0090 | |
| Letter from Serck Radiators Limited discussing the weights of Marston Mk.VI and experimental radiators. | 10th Sep 1938 | Box 150 \ 2 scan0091 | |
| Letter to John Marston Ltd. regarding the dispatch of prints PD.249 and PD.250. | 12th Sep 1938 | Box 150 \ 2 scan0092 | |
| Modification to the B.II 'M' Series radiator shutter sets and their production rollout. | 14th Sep 1938 | Box 150 \ 2 scan0093 | |
| Visit from Mr. Dunn of Messrs. John Marston Ltd. and the settlement of charges. | 14th Sep 1938 | Box 150 \ 2 scan0094 | |
| Letter to John Marston Ltd. regarding Bentley III radiator modifications and requesting performance data. | 15th Sep 1938 | Box 150 \ 2 scan0095 | |
| Page 2 of a letter referencing drawing PD.244. | 15th Sep 1938 | Box 150 \ 2 scan0096 | |
| Letter to a supplier regarding the manufacture and supply of radiator parts for various car models. | 19th Sep 1938 | Box 150 \ 2 scan0097 | |
| List of forwarded component details with part numbers. | 20th Sep 1938 | Box 150 \ 2 scan0098 | |
| Cover letter to John Marston Ltd. enclosing prints that were accidentally omitted from a previous letter. | 20th Sep 1938 | Box 150 \ 2 scan0099 | |
| Order for various radiators from John Marston Ltd. | 20th Sep 1938 | Box 150 \ 2 scan0100 | |
| Follow-up letter to The Leyland & Birmingham Rubber Co. Ltd. regarding a report on a defective rubber hose. | 22th Sep 1938 | Box 150 \ 2 scan0101 | |
| Procedure for flow testing radiator matrices for various chassis models. | 22th Sep 1938 | Box 150 \ 2 scan0102 | |
| Costs and procedure for inspecting and re-dipping a tank and matrix by Messrs. Marston. | 22th Sep 1938 | Box 150 \ 2 scan0103 | |
| Letter to John Marston Ltd. regarding details for the Wraith 80 inner radiator unit. | 23th Sep 1938 | Box 150 \ 2 scan0104 | |
| Despatch of a B.III radiator matrix unit back to Messrs. Marston Ltd. for examination. | 28th Sep 1938 | Box 150 \ 2 scan0105 | |
| Letter from a rubber manufacturer regarding tests on sample hose connections. | 24th Sep 1938 | Box 150 \ 2 scan0106 | |
| Letter from John Marston Limited acknowledging receipt of detailed drawings for a 'Wraith' 80 Inner Radiator Unit. | 26th Sep 1938 | Box 150 \ 2 scan0107 | |
| Modification and standardization of radiator steam valves for the Wraith III, B.3, B.50, and Silver Wraith models. | 29th Jun 1938 | Box 150 \ 2 scan0108 | |
| Letter from Wingard (M.A.) Ltd. regarding a sample Radiator Hose Clip and quotation. | 28th Sep 1938 | Box 150 \ 2 scan0109 | |
| Quotation from Wingard (M.A.) Ltd. for radiator hose clips. | 28th Sep 1938 | Box 150 \ 2 scan0110 | |
| Letter from The Leyland & Birmingham Rubber Co. Ltd following up on a query regarding recent tests. | 3rd Oct 1938 | Box 150 \ 2 scan0111 | |
| Letter to The Leyland & Birmingham Rubber Co. Ltd. regarding tests on and failure of hose connections. | 4th Oct 1938 | Box 150 \ 2 scan0112 | |
| Costs and logistics of radiator matrix inspection and repair. | 4th Oct 1938 | Box 150 \ 2 scan0113 | |
| Letter to a supplier concerning parts lists, altered drawings, and specifications for radiators. | 4th Oct 1938 | Box 150 \ 2 scan0114 | |
| Letter from a supplier regarding faulty hose connections due to over-vulcanization. | 5th Oct 1938 | Box 150 \ 2 scan0115 | |
| Letter to John Marston Ltd. regarding altered details for a Wraith 80 radiator unit. | 5th Oct 1938 | Box 150 \ 2 scan0116 | |
| Flow testing and marking of radiator matrices to assign responsibility for defects. | 6th Oct 1938 | Box 150 \ 2 scan0117 | |
| Letter to John Marstons Ltd. detailing the procedure for gauging and flow testing of radiator matrices. | 6th Oct 1938 | Box 150 \ 2 scan0118 | |
| Letter to John Marston Ltd. regarding the cost and process of flow testing for matrices. | 6th Oct 1938 | Box 150 \ 2 scan0119 | |
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