| Description | Date | Identifier | |
| Report from Robinhood Engineering Works Ltd. on KLG sparking plugs tested in a Condor IV engine. | 22th Mar 1927 | Box 58 \ 3 Scan096 | |
| The satisfactory performance of K.L.G. sparking plugs in Phantom chassis testing compared to Lodge plugs. | 3rd May 1927 | Box 58 \ 3 Scan097 | |
| Shortage of K.L.G. plugs for the Phantom chassis and the consequent need to use stock from the 20-HP model for testing. | 11th May 1927 | Box 58 \ 3 Scan098 | |
| The trial of K.L.G. spark plugs on Phantom chassis and an issue with the supply of Lodge plugs. | 12th May 1927 | Box 58 \ 3 Scan099 | |
| Communication clarifying the branding change of K.L.G. spark plugs from K.1.R to K.1. | 16th May 1927 | Box 58 \ 3 Scan100 | |
| Urgent internal order for KLG type 275 sparking plugs. | 19th May 1927 | Box 58 \ 3 Scan101 | |
| Seeking instructions on the disposition of 30 sets of K.L.G. spark plugs from the Phantom chassis. | 23th May 1927 | Box 58 \ 3 Scan102 | |
| Arguing for the adoption of K.L.G. plugs over Lodge plugs for 40/50 HP chassis, citing performance, cost savings, and supply. | 24th May 1927 | Box 58 \ 3 Scan103 | |
| The production and pricing of 275 K.L.G. plugs for the Experimental Department. | 24th May 1927 | Box 58 \ 3 Scan104 | |
| Return of 30 sets of K.L.G. plugs from Phantom Chassis to be re-issued for 20 HP production. | 24th May 1927 | Box 58 \ 3 Scan105 | |
| Hs. to Roy requesting an order for 72 K.L.G. sparking plugs No. 550. | 1st Aug 1928 | Box 58 \ 3 Scan106 | |
| Letter requesting an order for 72 more aero sparking plugs after satisfactory initial testing. | 13th Aug 1928 | Box 58 \ 3 Scan107 | |
| Letter from The Robinhood Engineering Works regarding the testing and ordering of K.L.G. sparking plugs. | 14th Aug 1928 | Box 58 \ 3 Scan108 | |
| Letter to The Robinhood Engineering Works requesting supply details for a new type of sparking plug. | 24th Aug 1928 | Box 58 \ 3 Scan109 | |
| Letter from The Robinhood Engineering Works regarding the performance and troubleshooting of a type 550 spark plug. | 27th Aug 1928 | Box 58 \ 3 Scan110 | |
| On the 10,000-mile test of a 20 HP car, discussing spark plug overheating and the need for new engine mountings. | 14th Jan 1929 | Box 58 \ 3 Scan111 | |
| Cost of K.L.G. 503 Sparking Plugs. | 1st May 1929 | Box 58 \ 3 Scan112 | |
| The return of K.L.G. Plugs Type 600 for inspection after testing. | 25th May 1929 | Box 58 \ 3 Scan113 | |
| Letter from K.L.G. Sparking Plugs regarding a criticism of No.611 plugs and the provision of new No.610 plugs. | 2nd Aug 1929 | Box 58 \ 3 Scan114 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting nuts and washers for specific plugs. | 20th Aug 1929 | Box 58 \ 3 Scan115 | |
| Letter from K.L.G. Sparking Plugs about specially made plugs with copper inserts for the Schneider Cup engine. | 30th Aug 1929 | Box 58 \ 3 Scan116 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the provision of one hundred spark plugs for a race. | 30th Aug 1929 | Box 58 \ 3 Scan117 | |
| Release note for 30 K.L.G. aeroplane sparking plugs type 618 for experimental purposes. | 30th Aug 1929 | Box 58 \ 3 Scan118 | |
| Release note for 30 K.L.G. Aeroplane Sparking Plugs type 618 for experimental purposes. | 30th Aug 1929 | Box 58 \ 3 Scan119 | |
| Request for 26 type 618 sparking plugs to be sent to Central Stores for return to K.L.G. | 22th Jan 1930 | Box 58 \ 3 Scan120 | |
| Telegram regarding the return of a batch of plugs and the dispatch of improved replacements. | 31th Jan 1930 | Box 58 \ 3 Scan121 | |
| Relaying a telegram from K.L.G. requesting the return of thirty unimproved TYPE 618 plugs. | 31th Jan 1930 | Box 58 \ 3 Scan122 | |
| Testing of new modified K.L.G. spark plugs against the standard Type K1. | 4th Feb 1930 | Box 58 \ 3 Scan123 | |
| Withdrawing a signature for the standardisation of K.L.G. plugs for the 20 HP model due to their design. | 24th Mar 1930 | Box 58 \ 3 Scan124 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding eroded plugs and mica insulation issues. | 4th Apr 1930 | Box 58 \ 3 Scan125 | |
| Two K.L.G. plugs being sent to K.L.G. Plugs Ltd. for examination. | 7th Apr 1930 | Box 58 \ 3 Scan126 | |
| Standardisation of improved K.1 K.L.G. plugs for 20 HP chassis. | 19th Mar 1930 | Box 58 \ 3 Scan127 | |
| Complaint letter to a supplier regarding a batch of unsatisfactory spark plugs. | 23th Feb 1931 | Box 58 \ 3 Scan128 | |
| Unauthorized electrode modification to spark plugs for the 20/25 HP Chassis. | 25th Feb 1931 | Box 58 \ 3 Scan129 | |
| Request to order an additional 5 dozen K.L.G. K.I. sparking plugs for extended testing. | 28th May 1931 | Box 58 \ 3 Scan130 | |
| Letter from K.L.G. Sparking Plugs Limited concerning the performance of two new sets of 14m/m plugs. | 8th Apr 1932 | Box 58 \ 3 Scan131 | |
| Advice note from K.L.G. Sparking Plugs Limited concerning the dispatch of sparking plugs. | 11th Apr 1932 | Box 58 \ 3 Scan132 | |
| Letter to K.L.G. Sparking Plugs regarding the receipt of small plugs. | 12th Apr 1932 | Box 58 \ 3 Scan133 | |
| The performance of four different types of 14 m/m sparking plugs on a C.XXII Unit. | 18th Apr 1932 | Box 58 \ 3 Scan134 | |
| Letter to K.L.G. Sparking Plugs Ltd. detailing test results of their LK.1 and S.5 plugs. | 18th Apr 1932 | Box 58 \ 3 Scan135 | |
| Despatch note regarding the return of 6 LK.1 Type Plugs to K.L.G.'s Ltd. for inspection. | 18th Apr 1932 | Box 58 \ 3 Scan136 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the performance and modification of 14 m.m. plugs. | 19th Apr 1932 | Box 58 \ 3 Scan137 | |
| Technical memo comparing the performance of Lodge and K.L.G. spark plugs, focusing on issues like misfiring and preignition. | 25th Apr 1932 | Box 58 \ 3 Scan138 | |
| Letter to Major Carrington of K.L.G. Sparking Plugs Ltd. regarding misfiring issues with their K.1 sparking plugs. | 25th Apr 1932 | Box 58 \ 3 Scan139 | |
| Letter from K.L.G. Sparking Plugs regarding the despatch of longer reach 14mm plugs and a visit to discuss issues with standard plugs. | 3rd May 1932 | Box 58 \ 3 Scan140 | |
| Request to despatch a set of twelve K.L.G. K.1 Thick Electrode Sparking Plugs to G.W. Hancock in France. | 9th May 1932 | Box 58 \ 3 Scan141 | |
| Letter from K.L.G. Sparking Plugs regarding the dispatch of six extension pieces for LKS6 plugs. | 5th May 1932 | Box 58 \ 3 Scan142 | |
| Request for 18 adaptors to test 14mm sparking plugs in experimental cars with 18mm plug holes. | 24th May 1932 | Box 58 \ 3 Scan143 | |
| Results of performance tests on different brands of sparking plugs. | 21th May 1932 | Box 58 \ 3 Scan144 | |
| Report page concluding on magneto inefficiency and carburation deficiency causing misfires. | 24th May 1932 | Box 58 \ 3 Scan145 | |
| Letter to a spark plug manufacturer regarding the testing and development of plugs for experimental cars. | 24th May 1932 | Box 58 \ 3 Scan146 | |
| Letter from K.L.G. Sparking Plugs discussing the supply, testing and design of L.K.S.5 spark plugs. | 25th May 1932 | Box 58 \ 3 Scan147 | |
| Letter to K.L.G. Sparking Plugs Ltd. about trying out models of a lengthened plug. | 27th May 1932 | Box 58 \ 3 Scan148 | |
| Ignition experiments conducted on a 25HP engine, detailing issues with spark plugs, distributors, and timing. | 30th May 1932 | Box 58 \ 3 Scan149 | |
| 25HP engine ignition, detailing a new bench apparatus for testing K.L.G. spark plugs and analysing low-speed performance. | 1st Jun 1932 | Box 58 \ 3 Scan150 | |
| Letter from K.L.G. Sparking Plugs regarding modified L.K.S. plugs with increased barrel lengths. | 7th Jun 1932 | Box 58 \ 3 Scan151 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding the suitability of different spark plug models for testing. | 11th Jun 1932 | Box 58 \ 3 Scan152 | |
| Letter from K.L.G. Sparking Plugs Limited confirming an order for one dozen L.K.S.5 type plugs for experimental work. | 13th Jun 1932 | Box 58 \ 3 Scan153 | |
| Despatch note regarding the return of 11 tested spark plugs to the supplier, K.L.G. Sparking Plugs Ltd. | 15th Jul 1932 | Box 58 \ 3 Scan154 | |
| Letter concerning the return of unsatisfactory spark plugs and the continued testing of a different model. | 15th Jul 1932 | Box 58 \ 3 Scan155 | |
| Order request for two dozen modified spark plugs for the Peregrine engine from Lodge Plug Co. and K.L.G. Sparking Plug Co. | 8th Aug 1932 | Box 58 \ 3 Scan156 | |
| Letter to a supplier requesting a modification to L.K.S.6 spark plugs and placing an order for one dozen. | 18th Aug 1932 | Box 58 \ 3 Scan157 | |
| Letter from K.L.G. Sparking Plugs regarding the design and supply of 14 m/m diameter car plugs. | 22th Aug 1932 | Box 58 \ 3 Scan158 | |
| Letter to K.L.G. Sparking Plugs Ltd requesting a set of a dozen 14mm plugs with increased reach. | 24th Aug 1932 | Box 58 \ 3 Scan159 | |
| Letter from a spark plug manufacturer regarding a custom order for 12 plugs with an increased reach. | 26th Aug 1932 | Box 58 \ 3 Scan160 | |
| Letter from K.L.G. Sparking Plugs Limited about despatching altered design plugs for testing. | 5th Sep 1932 | Box 58 \ 3 Scan161 | |
| Order for two types of K.L.G. 14mm plugs. | 26th Oct 1932 | Box 58 \ 3 Scan162 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the dispatch of an order for plugs. | 31th Oct 1932 | Box 58 \ 3 Scan163 | |
| Return of two K.L.G. sparking plugs for examination. | 21th Nov 1932 | Box 58 \ 3 Scan164 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding issues with LKS.6 plugs showing pre-ignition during engine testing. | 21th Nov 1932 | Box 58 \ 3 Scan165 | |
| Letter concerning returned L.K.S.6 plugs and forthcoming improved samples with increased heat resistance. | 22th Nov 1932 | Box 58 \ 3 Scan166 | |
| Inquiry about the provision of a sheet metal battery box for the 20/25 chassis and the preparation of a special battery for testing. | 22th Jan 1931 | Box 58 \ 3 Scan167 | |
| The battery arrangement for the 'Japan 3' project, favouring width over length. | 23th Jan 1931 | Box 58 \ 3 Scan168 | |
| Alternative battery options for the Japan 3 project, comparing cost and capacity. | 23th Jan 1931 | Box 58 \ 3 Scan169 | |
| Technical justification for using the more expensive TBD7E battery over cheaper alternatives for the 20/25HP model. | 4th Feb 1931 | Box 58 \ 3 Scan170 | |
| Design, materials, and layout of car batteries. | 4th Feb 1931 | Box 58 \ 3 Scan171 | |
| Note regarding battery leakage between cell terminals and retaining features in any new layout. | 4th Feb 1931 | Box 58 \ 3 Scan172 | |
| Performance report and discharge test results for a battery after 13,305 miles. | 4th Feb 1931 | Box 58 \ 3 Scan173 | |
| Modifications to the brake cables and battery arrangement for project 'JAPAN 3'. | 5th Feb 1931 | Box 58 \ 3 Scan174 | |
| Chart recording of an electrical test, showing amperage over time. | 2nd Feb 1931 | Box 58 \ 3 Scan175 | |
| Japan 3 project, comparing a 6-cell in-line battery with the standard 20/25 battery arrangement. | 6th Feb 1931 | Box 58 \ 3 Scan176 | |
| Arguing against the use of an inferior battery for economy reasons, detailing the technical disadvantages. | 1st Feb 1931 | Box 58 \ 3 Scan177 | |
| Improvements in battery design, reliability, and lifespan, specifically regarding separators and acid gravity. | 1st Feb 1931 | Box 58 \ 3 Scan178 | |
| Letter to a battery supplier regarding terminal corrosion and referencing a previous solution. | 6th Feb 1931 | Box 58 \ 3 Scan179 | |
| Letter to Messrs. Peto & Radford concerning a complaint from Messrs. Hoopers about battery corrosion. | 10th Feb 1931 | Box 58 \ 3 Scan180 | |
| Secret memo regarding the request for a '6 in line' battery configuration to allow for better positioning of brake ropes on the Japan 3 project. | 10th Feb 1931 | Box 58 \ 3 Scan181 | |
| Letter to The National Accumulator Co. Ltd. regarding an error in their car battery catalogue. | 11th Feb 1931 | Box 58 \ 3 Scan182 | |
| Letter from National Accumulator Co Ltd regarding an error in their catalogue. | 13th Feb 1931 | Box 58 \ 3 Scan183 | |
| New 'S' Type terminal and domed cell lid for the 20/25HP chassis battery. | 14th Feb 1931 | Box 58 \ 3 Scan184 | |
| Cracked battery lid for a 20/25-HP chassis and ordering a replacement. | 28th Jan 1932 | Box 58 \ 3 Scan185 | |
| Electrical experimental record sheet for a component, logging test periods, locations, and mileage. | 20th Apr 1931 | Box 58 \ 3 Scan186 | |
| Electrical experimental record sheet for an Exide battery, tracking mileage. | 20th Apr 1931 | Box 58 \ 3 Scan187 | |
| Experimental record sheet for an Exide 6XL3-4-6 battery test. | 20th Apr 1931 | Box 58 \ 3 Scan188 | |
| Experimental record sheet tracking the mileage and performance of a battery. | 20th Apr 1931 | Box 58 \ 3 Scan189 | |
| Test results for a P&RTBD7E-15 battery detailing low and high rate discharge performance. | 24th Feb 1931 | Box 58 \ 3 Scan190 | |
| Letter to Messrs. Peto & Radford regarding tests on a modified 3.RRN11 battery and enclosing a report. | 10th Mar 1931 | Box 58 \ 3 Scan191 | |
| Test report on a National RRN.11 battery with modified negative grids. | 17th Nov 1930 | Box 58 \ 3 Scan192 | |
| Letter from accumulator manufacturer Peto & Radford regarding test results of a 3-RRN11 battery. | 12th Mar 1931 | Box 58 \ 3 Scan193 | |
| Graph chart recording the results of a component test, including average amperes, hours, and ampere-hours. | 18th Mar 1930 | Box 58 \ 3 Scan194 | |
| Battery test chart recording amperage and ampere-hours over time. | 31th Dec 1929 | Box 58 \ 3 Scan195 | |
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