| Description | Date | Identifier | |
| Official order be sent to Messrs. Sanderson & Holmes for work carried out. | 15th Jun 1938 | Box 134 \ 4 scan0415 | |
| Official order for repairs to be sent to Messrs. Sanderson & Holmes. | 1st Jul 1938 | Box 134 \ 4 scan0416 | |
| Requesting an official order be sent to Messrs. Sanderson for completed work. | 11th Jul 1938 | Box 134 \ 4 scan0417 | |
| Official order be sent to Sanderson & Holmes for work carried out on a list of cars. | 15th Jul 1938 | Box 134 \ 4 scan0418 | |
| Official order for work carried out by Sanderson & Holmes. | 16th Jul 1938 | Box 134 \ 4 scan0419 | |
| Cover memo for invoices received from Sanderson & Holmes Limited. | 22th Jul 1938 | Box 134 \ 4 scan0420 | |
| Cover note for three invoices from Sanderson & Holmes, Ltd. submitted for approval. | 25th Jul 1938 | Box 134 \ 4 scan0421 | |
| Official order for work carried out on various cars by Sanderson & Holmes Ltd. | 22th Aug 1938 | Box 134 \ 4 scan0422 | |
| Official order be sent to Messrs. Sanderson & Holmes. | 20th Sep 1938 | Box 134 \ 4 scan0423 | |
| Official order be sent to Messrs. Sanderson & Holmes for a list of items. | 30th Sep 1938 | Box 134 \ 4 scan0424 | |
| Requesting an official order be sent to Messrs. Sanderson & Holmes for work carried out. | 14th Oct 1938 | Box 134 \ 4 scan0425 | |
| Expense claim form from 'Rm' detailing travel costs for September and October 1938. | 18th Oct 1938 | Box 134 \ 4 scan0426 | |
| Official order be sent to Messrs. Sanderson & Holmes. | 22th Oct 1938 | Box 134 \ 4 scan0427 | |
| Official order be sent to Messrs. Tanderson & Holmes for work carried out. | 26th Oct 1938 | Box 134 \ 4 scan0428 | |
| Request to send an official order to Messrs. Sanderson & Holmes for a list of items. | 1st Nov 1938 | Box 134 \ 4 scan0429 | |
| Requesting an official order for work carried out by Messrs. Sanderson & Holmes. | 4th Nov 1938 | Box 134 \ 4 scan0430 | |
| Request to send an official order to Messrs. Sanderson & Holmes for repairs. | 22th Nov 1938 | Box 134 \ 4 scan0431 | |
| Internal request to place an official order with Sanderson & Holmes for various parts and tools. | 25th Nov 1938 | Box 134 \ 4 scan0432 | |
| Official order to be sent to Messrs. Sanderson & Holmes for a list of items. | 6th Dec 1938 | Box 134 \ 4 scan0433 | |
| The placement of an official order with Sanderson & Holmes. | 20th Dec 1938 | Box 134 \ 4 scan0434 | |
| Official order for parts to be placed with Sanderson & Holmes. | 21th Dec 1938 | Box 134 \ 4 scan0435 | |
| Internal memorandum requesting an invoice check and the sending of an official order. | 22th Dec 1938 | Box 134 \ 4 scan0436 | |
| Request to send an official order to Messrs. Sanderson & Holmes for work carried out on 1.B.50. | 23th Dec 1938 | Box 134 \ 4 scan0437 | |
| Request to send an official order to Messrs. Sanderson & Holmes for work carried out. | 29th Dec 1938 | Box 134 \ 4 scan0438 | |
| Graph of power curves, torque, and B.M.E.P. for a single-cylinder engine. | 12th Sep 1938 | Box 134 \ 5 scan0001 | |
| Performance graph for a 4 1/8' bore, 6' stroke gas engine, plotting B.HP, Torque, and Consumption against engine R.P.M. | 23th Dec 1939 | Box 134 \ 5 scan0002 | |
| Performance graph for a 4 1/8' Bore x 6' Stroke Gas Engine plotting BHP against RPM. | 19th Mar 1940 | Box 134 \ 5 scan0003 | |
| Letter from F. M. Aspin & Co. Ltd. apologising for a delayed response to a letter from March 27th. | 3rd Apr 1940 | Box 134 \ 5 scan0004 | |
| Letter to F.M. Aspin of Experimental Laboratories requesting technical details of a gas engine. | 27th Mar 1940 | Box 134 \ 5 scan0005 | |
| Poor mechanical efficiency figures of an engine, specifically questioning the power required for the rotary valve. | 13th Mar 1940 | Box 134 \ 5 scan0006 | |
| Letter from F.M. Aspin & Co. Ltd. to Mr. Robotham arranging a visit to their works. | 13th Mar 1940 | Box 134 \ 5 scan0007 | |
| Letter to Mr. F.M. Aspin suggesting a meeting for the following Friday. | 11th Mar 1940 | Box 134 \ 5 scan0008 | |
| Letter from F.M. Aspin & Co. Ltd. to Mr. Rowbottam inviting him for a visit to view their engines. | 9th Mar 1940 | Box 134 \ 5 scan0009 | |
| Comparison of valve opening areas for different engine designs, specifically comparing Aspin and BGO types. | 27th Jun 1940 | Box 134 \ 5 scan0010 | |
| Blueprint with diagrams and a graph comparing two-stroke valve opening areas for different engine designs. | 28th Nov 1940 | Box 134 \ 5 scan0011 | |
| Design drawing for a 3-port induction pipe and valve mechanism for a six-cylinder engine, with associated calculations. | 14th Jun 1939 | Box 134 \ 5 scan0012 | |
| Confirming a crankshaft modification for a 4-cylinder mock-up unit. | 14th Jun 1939 | Box 134 \ 5 scan0013 | |
| Performance comparison and analysis for a proposed 2.8 Litre 4-cylinder engine against competitor vehicles. | 28th Jun 1939 | Box 134 \ 5 scan0014 | |
| Vehicle weight targets in relation to performance against competitor cars. | 28th Jun 1939 | Box 134 \ 5 scan0015 | |
| Comparative table of performance and specification data for various cars, including two Rolls-Royce models. | 30th Aug 1939 | Box 134 \ 5 scan0016 | |
| The conversion of a Bentley 60 Unit to a 4 Cylinder Unit. | 30th Aug 1939 | Box 134 \ 5 scan0017 | |
| Development of a 2.8 litre 4-cylinder engine and the continuation of experimental car work during hostilities. | 18th Oct 1939 | Box 134 \ 5 scan0018 | |
| Road test of a 2.8 litre 4-cylinder engine and the sourcing of parts to build a test vehicle. | 18th Oct 1939 | Box 134 \ 5 scan0019 | |
| Modifications to a 4-cylinder 'Thumper' type engine for the 'Rippletto' model. | 25th Oct 1939 | Box 134 \ 5 scan0020 | |
| Change in engine capacity for a 4-cylinder engine from 2.1 litres to under 2 litres. | 27th Oct 1939 | Box 134 \ 5 scan0021 | |
| To Mr. Vickers regarding the dispatch of drawings for a new 4-cylinder engine and a Straight 8 Alum engine. | 11th Dec 1939 | Box 134 \ 5 scan0022 | |
| To Mr. Vickers regarding prints for a 4-cylinder engine and a discussion of patterns for a 6-cylinder engine. | 15th Dec 1939 | Box 134 \ 5 scan0023 | |
| The production of three 4-cylinder crankshafts from print RE.110. | 15th Dec 1939 | Box 134 \ 5 scan0024 | |
| Two blueprint sheets for a new cylinder head detail for a B.40 Chassis. | 15th Dec 1939 | Box 134 \ 5 scan0025 | |
| Confirming the delivery of two blueprints for a new crankshaft design. | 15th Dec 1939 | Box 134 \ 5 scan0026 | |
| To Mr. Vickers instructing a hold on the patterns for the 4-cylinder crankcase and cylinder head. | 16th Dec 1939 | Box 134 \ 5 scan0027 | |
| Distributing blueprints for a B.40 Chassis 2 Litre Piston and Gudgeon Pin, with a request to obtain supply particulars from Aerolite. | 28th Dec 1939 | Box 134 \ 5 scan0028 | |
| Blueprints for a B.40 Chassis 2 Litre connecting rod and bushes for production by a supplier. | 28th Dec 1939 | Box 134 \ 5 scan0029 | |
| Blueprints and parts required for a B 40 2Litre engine's exhaust manifold. | 1st Jan 1940 | Box 134 \ 5 scan0030 | |
| Blueprints for B.40 2 Litre engine oil relief valves. | 1st Jan 1940 | Box 134 \ 5 scan0031 | |
| Blueprints for new camshaft parts and instructions for their implementation. | 5th Jan 1940 | Box 134 \ 5 scan0032 | |
| Distributing blueprints for a B.40 3 1/4 bore cylinder and crankcase. | 9th Jan 1940 | Box 134 \ 5 scan0033 | |
| Distributing new blueprints for RE B.40 Engine bearing caps and instructing on pattern alterations. | 17th Jan 1940 | Box 134 \ 5 scan0034 | |
| Distributing blueprints for new rocker cover and joint designs for a B.40 -2Litre engine. | 18th Jan 1940 | Box 134 \ 5 scan0035 | |
| For the B.40 (2 litre) chassis programme concerning new drawings for rocker covers and joints. | 22th Jan 1940 | Box 134 \ 5 scan0036 | |
| Chassis programme for the B.40 engine, detailing new drawings for crankcase and bearing caps. | 22th Jan 1940 | Box 134 \ 5 scan0037 | |
| Drawing revisions for a connecting rod and cap to accommodate Vandervell's standard bearing material. | 22th Jan 1940 | Box 134 \ 5 scan0038 | |
| Alteration details for a B40-2 Litre cylinder head, adding a boss for a thermometer. | 25th Jan 1940 | Box 134 \ 5 scan0039 | |
| Alteration note for adding core plug holes to the crankcase and cylinders of a B40 2 Litre Chassis. | 30th Jan 1940 | Box 134 \ 5 scan0040 | |
| The issue of blueprints for a dipstick assembly for the B.40 2-Litre engine. | 30th Jan 1940 | Box 134 \ 5 scan0041 | |
| Dispatch of blueprints for B. 40. - 2 Litre inlet pipes and related parts. | 30th Jan 1940 | Box 134 \ 5 scan0042 | |
| Parts notification memo for a Bentley 40 (2 litre) engine, detailing new dipstick and breather components. | 1st Feb 1940 | Box 134 \ 5 scan0043 | |
| Request to produce three sets of inlet pipe parts for the Bentley 40 (2 litre) engine. | 1st Feb 1940 | Box 134 \ 5 scan0044 | |
| Sending blueprints for various bearing bushes and an oil baffle. | 2nd Feb 1940 | Box 134 \ 5 scan0045 | |
| Alteration notice for a B.40 2-litre engine connecting rod, cap, and large end bush. | 13th Feb 1940 | Box 134 \ 5 scan0046 | |
| Providing blueprints for the B.40 - 2 Litre engine List of Parts (L.O.P's) index sheet and instructing the ordering of specific components. | 22th Feb 1940 | Box 134 \ 5 scan0047 | |
| New drawings for the B.40 Engine crankcase and cylinder section. | 22th Feb 1940 | Box 134 \ 5 scan0048 | |
| Blueprints and instructions for the B.40 2 Litre Cylinder Head assembly. | 22th Feb 1940 | Box 134 \ 5 scan0049 | |
| The dispatch of blueprints for 2 Litre valve mechanism parts. | 22th Feb 1940 | Box 134 \ 5 scan0050 | |
| Distributing blueprints and new details for the B.40 2 Litre engine crankshaft scheme. | 22th Aug 1940 | Box 134 \ 5 scan0051 | |
| Secret memo regarding prints for the Lucas Dynamo B.40 Unit and associated modifications. | 22th Feb 1940 | Box 134 \ 5 scan0052 | |
| Requesting the production of four induction pipes with different diameters. | 29th Feb 1940 | Box 134 \ 5 scan0053 | |
| Horsepower and B.M.E.P. curves for Standard 10 HP and Hillman Minx engines. | 6th Mar 1940 | Box 134 \ 5 scan0054 | |
| Performance graph comparing BHP and BMEP against RPM for Standard and Hillman engines. | 7th Mar 1940 | Box 134 \ 5 scan0055 | |
| Request for prints to produce three experimental bore sizes for the induction pipe RE.155. | 7th Mar 1940 | Box 134 \ 5 scan0056 | |
| Mean Effective Pressure (M.E.P.) curves for the Hillman Minx and the Standard. | 7th Mar 1940 | Box 134 \ 5 scan0057 | |
| Instructions regarding blueprints for B.40 Chassis and PL.13 Engine Oil Fittings. | 11th Mar 1940 | Box 134 \ 5 scan0058 | |
| Instructions and parts list for B.40 Chassis water connections and water pump. | 11th Mar 1940 | Box 134 \ 5 scan0059 | |
| Alteration note for a B40-2 Litre engine, detailing the addition of parts to the crankcase and bearings. | 28th Feb 1940 | Box 134 \ 5 scan0060 | |
| The issue of blueprints for a modified wheelcase, RE.1017, for B.40 & B.60 engines. | 7th May 1940 | Box 134 \ 5 scan0061 | |
| Alteration note detailing the shortening of a dipstick boss and changes to its dimensions. | 11th Jun 1939 | Box 134 \ 5 scan0062 | |
| Design revision note for adding a view of a cutter to facilitate the withdrawal of setscrews to the casing. | 11th Jun 1939 | Box 134 \ 5 scan0063 | |
| Transmitting blueprints for the B.40 3 1/2 Bore Engine's connecting rod and piston. | 15th May 1940 | Box 134 \ 5 scan0064 | |
| Alteration of the collar angle for the tappet cover cap nut due to a drawing office error. | 17th May 1940 | Box 134 \ 5 scan0065 | |
| Conclusion on testing two types of high-power cylinder heads. | 9th Sep 1940 | Box 134 \ 5 scan0066 | |
| Test drive report on a 4-cylinder car, noting performance issues and suggesting improvements. | 4th Jul 1941 | Box 134 \ 5 scan0067 | |
| Engine compression ratios for 4-cylinder engines in relation to post-war fuels. | 7th Jul 1941 | Box 134 \ 5 scan0068 | |
| Radiator shutter options for 4, 6, and 8-cylinder engines. | 8th Sep 1941 | Box 134 \ 5 scan0069 | |
| Agreement on producing a 4-cylinder crankcase and cylinder using a modified pattern for experimental purposes. | 7th Mar 1944 | Box 134 \ 5 scan0070 | |
| Specification of work and new parts fitted to a Bentley 40, Unit No.1. | 28th Mar 1944 | Box 134 \ 5 scan0071 | |
| Official order be sent to Messrs. Sanderson & Holmes for various items. | 3rd Jan 1939 | Box 134 \ 5 scan0072 | |
| Official order to be placed with Messrs. Sanderson & Holmes. | 10th Jan 1939 | Box 134 \ 5 scan0073 | |
| Official order be sent to Messrs. Sanderson & Holmes for two items. | 11th Jan 1939 | Box 134 \ 5 scan0074 | |
| Request to issue an official order to Messrs. Sanderson & Holmes for work carried out on a test rig and several cars. | 30th Jan 1939 | Box 134 \ 5 scan0075 | |
| Internal request to send an official order to Messrs. Sanderson & Holmes for a list of items. | 7th Feb 1939 | Box 134 \ 5 scan0076 | |
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