| Description | Date | Identifier | |
| Requesting an official requisition for 120 Type 765.A. Sparking Plugs sent as replacements. | 24th Nov 1936 | Box 162 \ 4 img199 | |
| Letter from K.L.G Sparking Plugs Limited following up on a previous correspondence and requesting an order form. | 26th Nov 1936 | Box 162 \ 4 img200 | |
| Return of platinum-tipped spark plugs due to misfiring on a 3.5-litre Bentley. | 27th Nov 1936 | Box 162 \ 4 img201 | |
| Letter to Messrs K.L.G. Sparking Plugs Ltd. regarding a requisition. | 27th Nov 1936 | Box 162 \ 4 img202 | |
| Letter from K.L.G Sparking Plugs Limited concerning a memorandum on integrally screened sparking plugs. | 27th Nov 1936 | Box 162 \ 4 img203 | |
| Important notice regarding K.L.G. integrally screened plugs, elbows, and connection parts for ignition harnesses. | 27th Nov 1936 | Box 162 \ 4 img204 | |
| Specification document for various elbow types and high tension cable connection parts. | 27th Nov 1936 | Box 162 \ 4 img205 | |
| Letter from the Ethyl Export Corporation regarding spark plug complaints on 3½ and 4¼ litre Bentley jobs, suspecting fuel types and cold induction. | 27th Nov 1936 | Box 162 \ 4 img206 | |
| Letter discussing spark plug issues related to deposit formation from cold induction and potential remedies. | 27th Nov 1936 | Box 162 \ 4 img207 | |
| Letter discussing the insulating properties of mica versus ceramic materials for wet spark plugs. | 30th Nov 1936 | Box 162 \ 4 img208 | |
| Engine misfire complaints, detailing tests with different spark plugs and petrols on Bentley cars. | 1st Dec 1936 | Box 162 \ 4 img209 | |
| Spark plug trouble, comparing K.L.G. and Bosch plugs, and investigating the effect of 'ESSO' petrol. | 1st Dec 1936 | Box 162 \ 4 img210 | |
| The performance of AC sparking plugs in a Trials Bentley, which were replaced due to misfiring. | 1st Dec 1936 | Box 162 \ 4 img211 | |
| Transfer of four KLG - 850 Sparking Plugs. | 1st Dec 1936 | Box 162 \ 4 img212 | |
| Letter from K.L.G Sparking Plugs Limited regarding plug orders and a complaint. | 1st Dec 1936 | Box 162 \ 4 img213 | |
| Sending six special sparking plugs for testing on a trials car. | 8th Dec 1936 | Box 162 \ 4 img214 | |
| Dispatch and trial of special ceramic insulated sparking plugs on a 25/30 trials car. | 8th Dec 1936 | Box 162 \ 4 img215 | |
| Letter from K.L.G. Sparking Plugs Limited regarding drawings for terminal extensions and plugs. | 9th Dec 1936 | Box 162 \ 4 img216 | |
| Letter to K.L.G. Ltd. confirming a telephone conversation and requesting the urgent supply of 12 sets of parts from specific drawings. | 9th Dec 1936 | Box 162 \ 4 img217 | |
| Letter from K.L.G. Sparking Plugs Limited regarding an order for spark plugs with platinum earth points. | 9th Dec 1936 | Box 162 \ 4 img218 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the readiness and invoicing of type 765-A plugs. | 9th Dec 1936 | Box 162 \ 4 img219 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding an invoicing correction for spark plugs. | 10th Dec 1936 | Box 162 \ 4 img220 | |
| Letter from K.L.G Sparking Plugs Limited enclosing three copies of drawings for R.945 and R.868 plugs. | 11th Dec 1936 | Box 162 \ 4 img221 | |
| Drawings for K.L.G. R.868 and R.945 sparking plugs for the Merlin G engine. | 14th Dec 1936 | Box 162 \ 4 img222 | |
| Letter to K.L.G. Sparking Plugs Ltd requesting a delivery date for new 'Corrundite' plugs for a Bentley chassis. | 16th Dec 1936 | Box 162 \ 4 img223 | |
| Letter from K.L.G Sparking Plugs Limited concerning the dispatch and development of spark plugs and extensions. | 18th Dec 1936 | Box 162 \ 4 img224 | |
| Letter from K.L.G. Sparking Plugs reporting on the failure of two type 850 plugs, one due to oil saturation and the other an electrical breakdown. | 21th Dec 1936 | Box 162 \ 4 img225 | |
| Dispatch note from K.L.G. Sparking Plugs Limited for replacement spark plugs. | 21th Dec 1936 | Box 162 \ 4 img226 | |
| Letter from K.L.G Sparking Plugs Limited regarding the dispatch of K.L.G. plugs type 765-A. | 21th Dec 1936 | Box 162 \ 4 img227 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the supply of six Bosch 175 plugs for a test. | 22th Dec 1936 | Box 162 \ 4 img228 | |
| The performance of Champion and K.L.G. sparking plugs after testing. | 23th Dec 1936 | Box 162 \ 4 img229 | |
| Letter to K.L.G. Sparking Plugs chasing an undelivered order for terminals and inquiring about different plug types. | 30th Dec 1936 | Box 162 \ 4 img230 | |
| Letter from K.L.G. Sparking Plugs Limited discussing the design and characteristics of sparking plug types 935 and 943. | 4th Jan 1937 | Box 162 \ 4 img231 | |
| Letter from K.L.G Sparking Plugs regarding the supply and pricing of terminals to a third party. | 25th Jan 1937 | Box 162 \ 4 img232 | |
| Letter to K.L.G. Sparking Plug Co. Ltd. regarding the retention of plugs for experimental purposes. | 8th Jan 1937 | Box 162 \ 4 img233 | |
| Dispatch of two types of sparking plugs for examination. | 15th Jan 1937 | Box 162 \ 4 img234 | |
| Letter detailing the performance test results of Bosch sparking plugs on a Bentley engine. | 15th Jan 1937 | Box 162 \ 4 img235 | |
| Requesting the return of 12 special sparking plugs to K.L.G. Co. for examination. | 15th Jan 1937 | Box 162 \ 4 img236 | |
| Letter from K.L.G. Sparking Plugs regarding tests and performance of their plugs in Bentley engines. | 16th Jan 1937 | Box 162 \ 4 img237 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting clarification on the type numbers of 'Cerundite' plugs. | 21th Jan 1937 | Box 162 \ 4 img238 | |
| Letter from KLG Sparking Plugs seeking clarification on the supply and invoicing of M.X.5/2 terminals. | 22th Jan 1937 | Box 162 \ 4 img239 | |
| Letter from K.L.G. Sparking Plugs explaining the identification markings and heat ratings for sample plugs supplied for the Phantom engine. | 22th Jan 1937 | Box 162 \ 4 img240 | |
| Letter from K.L.G. Sparking Plugs Limited detailing the specifications of a spark plug for a Bentley. | 22th Jan 1937 | Box 162 \ 4 img241 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding the supply and billing of MX.5/2 terminals. | 23th Jan 1937 | Box 162 \ 4 img242 | |
| Letter from K.L.G. Sparking Plugs regarding the dispatch of twelve 'Corundite' plugs for testing in Bentley cars. | 23th Jan 1937 | Box 162 \ 4 img243 | |
| Despatch note from K.L.G. Sparking Plugs Ltd for 'Corundite' Sparking Plugs sent for testing. | 23th Jan 1937 | Box 162 \ 4 img244 | |
| Letter from K.L.G Sparking Plugs regarding the supply of plugs for Bentley and Phantom models. | 30th Jan 1937 | Box 162 \ 4 img245 | |
| Letter from K.L.G Sparking Plugs Limited regarding a delay in the despatch of type PLB.50x(N) plugs. | 1st Feb 1937 | Box 162 \ 4 img246 | |
| Letter to a supplier regarding the failure of two sparking plugs after only four hours of use and requesting replacements. | 2nd Feb 1937 | Box 162 \ 4 img247 | |
| Request to dispatch two failed Type 393B Sparking Plugs to K.L.G. Sparking Plugs Ltd. for examination. | 2nd Feb 1937 | Box 162 \ 4 img248 | |
| Letter from KLG Sparking Plugs Ltd acknowledging a request for two custom sparking plugs. | 4th Feb 1937 | Box 162 \ 4 img249 | |
| Letter from K.L.G. Sparking Plugs regarding the condition of two returned 893B plugs used in a 'MERLIN' engine. | 5th Feb 1937 | Box 162 \ 4 img250 | |
| Request to carry out tests on K.L.G. Sparking Plugs fitted to 36 or 37 Ex chassis for early ignition and slow running performance. | 5th Feb 1937 | Box 162 \ 4 img251 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding spark plug dimensions for Bentley and 25/30 HP engines. | 9th Feb 1937 | Box 162 \ 4 img252 | |
| Internal request to order experimental stock of K.L.G. sparking plugs. | 10th Feb 1937 | Box 162 \ 4 img253 | |
| Issues with seizing K.L.G. sparking plugs and the manufacturer's response. | 10th Feb 1937 | Box 162 \ 4 img254 | |
| Letter from K.L.G. Sparking Plugs confirming the correct spark plug body length for Bentley and Rolls-Royce engines. | 11th Feb 1937 | Box 162 \ 4 img255 | |
| Dispatch of K.L.G. E.25 spark plugs with 'Curundite' insulators for testing on Phantom III trials cars. | 20th Feb 1937 | Box 162 \ 4 img256 | |
| Request to despatch 24 K.L.G. type E.25 plugs for testing in a Phantom III trials car. | 20th Feb 1937 | Box 162 \ 4 img257 | |
| The performance and replacement of Bosch, K.L.G., and Champion spark plugs. | 22th Feb 1937 | Box 162 \ 4 img258 | |
| Arranging the despatch of K.L.G. type E.25 sparking plugs for Phantom III Trials Cars. | 2nd Feb 1937 | Box 162 \ 4 img259 | |
| Testing of K.L.G. E.25 sparking plugs on a Phantom lll trials car and querying the use of Ethyl petrol. | 24th Feb 1937 | Box 162 \ 4 img260 | |
| Requesting the testing of two special K.L.G. sparking plugs, model RC25. | 25th Feb 1937 | Box 162 \ 4 img261 | |
| The preference for using Ethyl Petrol during plug testing for Phantom III Trials Cars. | 25th Feb 1937 | Box 162 \ 4 img262 | |
| Letter from K.L.G Sparking Plugs Limited regarding the urgent manufacture and delivery of type R-893 plugs. | 27th Feb 1937 | Box 162 \ 4 img263 | |
| Requesting a covering order for 500 K.L.G. sparking plugs for Bentley and 25/30 chassis. | 1st Mar 1937 | Box 162 \ 4 img264 | |
| Order to be placed for 12 type RC.25 plugs. | 2nd Mar 1937 | Box 162 \ 4 img265 | |
| The pricing and superiority of new K.L.G. ceramic sparking plugs. | 3rd Mar 1937 | Box 162 \ 4 img266 | |
| Letter placing an order for 48 RV9/1 plugs with K.L.G. Sparking Plugs Ltd. | 3rd Mar 1937 | Box 162 \ 4 img267 | |
| Requesting an increase in the order quantity for K.L.G. E.26 type plugs from 100 to 500. | 6th Mar 1937 | Box 162 \ 4 img268 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding a report on the performance of new type plugs with Corundite insulators. | 6th Mar 1937 | Box 162 \ 4 img269 | |
| Letter from K.L.G Sparking Plugs regarding the performance and design of their Corundite plugs. | 8th Mar 1937 | Box 162 \ 4 img270 | |
| The removal and inspection of 25 HP sparking plugs after 1,557 miles. | 20th Mar 1937 | Box 162 \ 4 img271 | |
| Testing three types of K.L.G. sparking plugs for a 30.HP engine. | 20th Mar 1937 | Box 162 \ 4 img272 | |
| Instructions for a component's brightening process involving material removal and addition. | 30th Mar 1937 | Box 162 \ 4 img273 | |
| Letter from K.L.G Sparking Plugs regarding the supply of fifteen R-868 electrodes for treatment with Brightray. | 30th Mar 1937 | Box 162 \ 4 img274 | |
| The performance of KLG.F.30x sparking plugs fitted to a Phantom III model and their subsequent replacement. | 16th Mar 1937 | Box 162 \ 4 img275 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding the failure of E.26 and E.25 type plugs. | 19th Mar 1937 | Box 162 \ 4 img276 | |
| The return of E.27 and E.25 type plugs to K.L.G. Ltd. for examination. | 19th Mar 1937 | Box 162 \ 4 img277 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding spark plug recommendations for George Eyston's R engined motor. | 19th Mar 1937 | Box 162 \ 4 img278 | |
| The standardization of new K.L.G. sparking plugs for various chassis. | 22th Mar 1937 | Box 162 \ 4 img279 | |
| Supply of specific K.L.G. sparking plugs for Phantom III trials cars. | 22th Mar 1937 | Box 162 \ 4 img280 | |
| Despatch of sparking plugs for examination and report. | 22th Mar 1937 | Box 162 \ 4 img281 | |
| The performance and inspection of new K.L.G. sparking plugs fitted to a transport car chassis. | 23th Mar 1937 | Box 162 \ 4 img282 | |
| Letter from K.L.G. Sparking Plugs discussing the choice of 675-A plugs for George Eyston's record attempt. | 25th Mar 1937 | Box 162 \ 4 img283 | |
| Letter from K.L.G Sparking Plugs regarding an examination and analysis of returned E.26 and E.25 type spark plugs. | 25th Mar 1937 | Box 162 \ 4 img284 | |
| Letter from K.L.G. Sparking Plugs regarding a damaged spark plug terminal. | 25th Mar 1937 | Box 162 \ 4 img285 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding plug point erosion. | 31th Mar 1937 | Box 162 \ 4 img286 | |
| The return of six E.27 sparking plugs for a Bentley chassis. | 3rd Apr 1937 | Box 162 \ 4 img287 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding the failure of sparking plugs with cracked insulators. | 6th Apr 1937 | Box 162 \ 4 img288 | |
| Request to arrange for 15 sparking plug electrodes to be sent to K.L.G. Sparking Plugs Ltd. | 7th Apr 1937 | Box 162 \ 4 img289 | |
| Letter to K.L.G. Sparking Plugs Ltd. confirming the standardisation of their new Corrundite insulated plugs. | 9th Apr 1937 | Box 162 \ 4 img290 | |
| The condition of special K.L.G. E.27 sparking plugs after 12,000 miles. | 15th Apr 1937 | Box 162 \ 4 img291 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting a new design for spark plug adaptors for the Phantom III chassis. | 16th Apr 1937 | Box 162 \ 4 img292 | |
| Letter to K.L.G. Sparking Plugs Ltd. chasing replies to previous correspondence and a sample plug. | 16th Apr 1937 | Box 162 \ 4 img293 | |
| Letter from K.L.G. Sparking Plugs regarding the use of W.5 nickel alloy instead of Mangonic for earth points to reduce erosion. | 19th Apr 1937 | Box 162 \ 4 img294 | |
| Standardisation of K.L.G. 'CORUNDITE' plugs type FLB.30X to avoid misfiring with Ethyl fuel. | 9th Mar 1937 | Box 162 \ 4 img295 | |
| Instruction to modify a fuel pipe and greasing system for the Continental model and implement it into production. | 26th Apr 1938 | Box 162 \ 4 img296 | |
| Standardisation of K.L.G. 'Corundite' plugs, type FLB.30X, for the 25/30 HP engine. | 9th Apr 1937 | Box 162 \ 4 img297 | |
| Notification for the standardization of parts to be brought into production immediately. | 13th Apr 1937 | Box 162 \ 4 img298 | |
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