| Description | Date | Identifier | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the supply and testing of various spark plugs. | 19th Aug 1936 | Box 162 \ 3 img016 | |
| Customer complaint regarding poor performance, a flat spot at 50 m.p.h., and an oil leak on a 4 1/4 litre Bentley. | 22th Aug 1936 | Box 162 \ 3 img017 | |
| Investigation into customer complaints of engine fading and leaking shock absorbers. | 21th Aug 1936 | Box 162 \ 3 img018 | |
| Unrecorded invoices for spark plugs from AC-Sphinx and Champion. | 22th Sep 1936 | Box 162 \ 3 img019 | |
| Letter from Champion Sparking Plug Co. Ltd. arranging a meeting to show samples of special plugs. | 29th Sep 1936 | Box 162 \ 3 img020 | |
| The trial of different sparking plugs on a Phantom III and a Bentley 4 1/4 litre trials car. | 30th Sep 1936 | Box 162 \ 3 img021 | |
| Letter to Champion Sparking Plug Co. Ltd. to arrange a visit. | 30th Sep 1936 | Box 162 \ 3 img022 | |
| Trial of certain plugs on Phantom III & Bentley trials cars. | 1st Oct 1936 | Box 162 \ 3 img023 | |
| Receipt of various Champion plugs to be booked in free of charge. | 3rd Oct 1936 | Box 162 \ 3 img024 | |
| Recommending the continued use of the 831 LR sparking plug for the 25/30 HP chassis due to reliability and cost. | 13th Oct 1936 | Box 162 \ 3 img025 | |
| 25/30 HP complaint regarding carburetter and plug trouble with the use of ethyl fuel. | 23th Oct 1936 | Box 162 \ 3 img026 | |
| Concluding statement regarding the removal of deposits by cleaning, compared to using mica plugs. | 28th Oct 1938 | Box 162 \ 3 img027 | |
| Letter from Champion Sparking Plug Co. Ltd. confirming a technical engineer's visit. | 28th Oct 1938 | Box 162 \ 3 img028 | |
| Letter regarding the dispatch and testing of Champion LB.10 sparking plugs on a 25/30 car. | 28th Oct 1936 | Box 162 \ 3 img029 | |
| Arranging the forwarding of Champion spark plugs to France for testing on Chassis 22-G-V. | 28th Oct 1936 | Box 162 \ 3 img030 | |
| Requesting a follow-up on the dispatch of half a dozen Champion Sparking Plugs. | 28th Oct 1936 | Box 162 \ 3 img031 | |
| Cover memo for an attached report received from G.W. Hancock. | 29th Oct 1936 | Box 162 \ 3 img032 | |
| Order to be placed with Messrs Champion for various sparking plugs. | 14th Nov 1936 | Box 162 \ 3 img033 | |
| Request to the Champion Sparking Plug Co. for a trial supply of L8S sparking plugs. | 4th Nov 1936 | Box 162 \ 3 img034 | |
| Instructing the despatch of various parts for a Bentley Chassis. | 9th Nov 1936 | Box 162 \ 3 img035 | |
| Letter to Champion Sparking Plug Co. Ltd. regarding modifications for Bentley chassis spark plugs. | 9th Nov 1936 | Box 162 \ 3 img036 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the supply of hotter plugs and terminals. | 10th Nov 1936 | Box 162 \ 3 img037 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding modifications for a Bentley chassis sparking plug. | 11th Nov 1936 | Box 162 \ 3 img038 | |
| Follow-up letter from Imperial Airways Ltd. requesting a sparking plug and information. | 12th Nov 1936 | Box 162 \ 3 img039 | |
| The performance of Champion spark plugs fitted to 25/30 models to resolve ongoing troubles. | 23th Nov 1936 | Box 162 \ 3 img040 | |
| Resume of experience with sparking plug troubles, particularly on the Bentley chassis, using K.L.G. Mica insulated plugs with leaded fuel. | 4th Dec 1936 | Box 162 \ 3 img041 | |
| Analysis of experimental tests on mica spark plugs, detailing their faults and comparing them to ceramic alternatives. | 4th Dec 1936 | Box 162 \ 3 img042 | |
| The performance and market developments of Champion and K.L.G. spark plugs. | 4th Dec 1936 | Box 162 \ 3 img043 | |
| The testing of faulty K.L.G. sparking plugs returned from Bentley cars. | 14th Dec 1936 | Box 162 \ 3 img044 | |
| Letter chasing the delivery of Champion sparking plugs for testing on a Bentley chassis. | 15th Dec 1936 | Box 162 \ 3 img045 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the delivery of LB.types plugs. | 16th Dec 1936 | Box 162 \ 3 img046 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the supply of N.A.8 spark plugs and a Service Unit and Tester. | 17th Nov 1936 | Box 162 \ 3 img047 | |
| Requesting the purchase of a ceramic sparking plug cleaning machine from the Champion Sparking Plug Co. Ltd. | 14th Dec 1936 | Box 162 \ 3 img048 | |
| The failure and inspection of Champion Sparking Plugs from a 36-EX engine. | 30th Dec 1936 | Box 162 \ 3 img049 | |
| Letter from Champion Sparking Plug Co. Ltd. confirming a telegram and arranging a visit to deliver special plugs. | 5th Jan 1937 | Box 162 \ 3 img050 | |
| To G.W. Hancock regarding the dispatch of Champion LB.9 plugs for testing on a Bentley. | 9th Jan 1937 | Box 162 \ 3 img051 | |
| Transfer of Champion sparking plugs for a Bentley Trials Car. | 11th Jan 1937 | Box 162 \ 3 img052 | |
| Query regarding which ignition plugs to use, AC or Champion, for a vehicle in France. | 11th Jan 1937 | Box 162 \ 3 img053 | |
| Receipt of Wakefield's oil, white metal bearings, and issues with unsuitable Champion LB.9 spark plugs. | 13th Jan 1937 | Box 162 \ 3 img054 | |
| Letter discussing the fitting and testing of various types of spark plugs. | 14th Jan 1937 | Box 162 \ 3 img055 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the supply and stock of various spark plug types. | 20th Jan 1937 | Box 162 \ 3 img056 | |
| The performance and testing of K.L.G. Corundite, Bosch, and Lodge sparking plugs. | 22th Jan 1937 | Box 162 \ 3 img057 | |
| Letter to Champion Sparking Plug Co. Ltd. requesting 72 type N.A.7 plugs. | 23th Jan 1937 | Box 162 \ 3 img058 | |
| Requesting a covering order for 72 type N.A.7. sparking plugs from the Champion Sparking Plug Co. Ltd. | 23th Jan 1937 | Box 162 \ 3 img059 | |
| Inquiry from Ethyl Export Corporation regarding tests of a 'Marathon' aviation spark plug. | 27th Jan 1937 | Box 162 \ 3 img060 | |
| Letter to Ethyl Export Corporation enquiring about a 'Marathon' spark plug from the Massa Company for testing. | 28th Jan 1937 | Box 162 \ 3 img061 | |
| Letter from Ethyl Export Corporation regarding an inquiry for a high duty plug. | 29th Jan 1937 | Box 162 \ 3 img062 | |
| Letter to the Champion Sparking Plug Co. requesting samples of their latest aero plugs for experimental testing. | 1st Feb 1937 | Box 162 \ 3 img063 | |
| Letter to Champion Sparking Plug Co. Ltd. enquiring about the specifications and availability of type L.8 spark plugs for Bentley chassis. | 2nd Feb 1937 | Box 162 \ 3 img064 | |
| Availability of Phantom III sparking plugs. | 4th Feb 1937 | Box 162 \ 3 img065 | |
| Correction notice regarding the correct Champion sparking plugs for the 20HP model. | 4th Feb 1937 | Box 162 \ 3 img066 | |
| Failure of Champion LB.9 spark plugs after 719 miles and reverting to K.L.G. plugs. | 1st Mar 1937 | Box 162 \ 3 img067 | |
| The removal, inspection, and replacement of K.L.G. and Champion spark plugs in two Bentley cars. | 13th Mar 1937 | Box 162 \ 3 img068 | |
| The despatch of K.L.G. plugs for Sg's car. | 24th Mar 1937 | Box 162 \ 3 img069 | |
| The failure of experimental plugs in car 61-FC after 1614 miles. | 25th Mar 1937 | Box 162 \ 3 img070 | |
| Misfiring of E.27-KLG plugs in a customer's car due to overheating. | 25th Mar 1937 | Box 162 \ 3 img071 | |
| Serious misfiring and overheating issues of E.27-KLG plugs. | 25th Mar 1937 | Box 162 \ 3 img072 | |
| Request to dispatch six plugs (FL8.30X) to Lillie Hall to be fitted to a Bentley chassis. | 2nd Apr 1937 | Box 162 \ 3 img073 | |
| The testing of K.L.G. type FLS.30X spark plugs removed from a Bentley chassis. | 2nd Apr 1937 | Box 162 \ 3 img074 | |
| Letter from an accumulator manufacturer discussing the performance of different spark plugs in Bentley cars. | 3rd Apr 1937 | Box 162 \ 3 img075 | |
| Letter acknowledging customer feedback on plugs and requesting their return for examination. | 4th Apr 1937 | Box 162 \ 3 img076 | |
| Fitting Kerundite Sparking Plugs to all car types and requesting delivery rate information from K.L.G. Co. | 7th Apr 1937 | Box 162 \ 3 img077 | |
| Required quantity of 'Corundite' sparking plugs for various chassis models. | 9th Apr 1937 | Box 162 \ 3 img078 | |
| The supply and distribution plan for 'Corundite' sparking plugs. | 9th Apr 1937 | Box 162 \ 3 img079 | |
| Returning a K.L.G. E.27 sparking plug removed from Chassis B-56-B.N. for examination and repair. | 10th Apr 1937 | Box 162 \ 3 img080 | |
| Sending electrical specifications to manufacturers and clarifying production testing requirements. | 11th Jun 1937 | Box 162 \ 3 img081 | |
| The performance of K.L.G. 929B ignition plugs tested in Kestrel VI engines on a 'Heyford' aircraft. | 14th Apr 1937 | Box 162 \ 3 img082 | |
| Performance and testing of Champion and K.L.G. sparking plugs in a Bentley 6.B.IV. | 9th Jan 1937 | Box 162 \ 3 img083 | |
| Request from Excelsior Motor Company for spark plug terminals for their racing motorcycle engines. | 26th May 1937 | Box 162 \ 3 img084 | |
| Letter from Ethyl Export Corporation concerning sparking plug trouble, enclosing correspondence from the United States. | 28th May 1937 | Box 162 \ 3 img085 | |
| Letter from Ethyl Gasoline Corporation regarding views on spark plug failure and testing on various car makes. | 18th May 1937 | Box 162 \ 3 img086 | |
| Letter to Excelsior Motor Co. Ltd. confirming the availability of Phantom III ignition terminals. | 31th May 1937 | Box 162 \ 3 img087 | |
| Request to despatch six Phantom III type plug terminals to the Excelsior Motor Co. Ltd. | 4th Jun 1937 | Box 162 \ 3 img089 | |
| Sending six ignition plug terminals to The Excelsior Motor Co. Ltd. | 4th Jun 1937 | Box 162 \ 3 img090 | |
| Design flaws found in a new type of ignition plug terminal. | 11th Jun 1937 | Box 162 \ 3 img091 | |
| Faults and potential design improvements for the Phantom III ignition plug terminals and high tension wires. | 11th Jun 1937 | Box 162 \ 3 img092 | |
| Modified terminal and the use of Helax high tension wire for production. | 11th Jun 1937 | Box 162 \ 3 img093 | |
| Sketches of a cable terminal clip from three views with handwritten design notes. | 14th Jun 1937 | Box 162 \ 3 img094 | |
| Policy on using old versus new K.L.G. spark plugs in Bentley production due to issues with Ethyl petrol. | 14th Jun 1937 | Box 162 \ 3 img095 | |
| Letter from Peto & Radford regarding the performance of experimental plugs after a 1500-mile test. | 2nd Jul 1937 | Box 162 \ 3 img096 | |
| Letter from Champion Sparking Plug Co. Ltd. to Mr. H. West, requesting a meeting with Mr. H. W. Irving. | 23th Aug 1937 | Box 162 \ 3 img098 | |
| Letter to the Champion Sparking Plug Co. Ltd. to arrange a meeting. | 24th Aug 1937 | Box 162 \ 3 img099 | |
| Letter from Champion Sparking Plug Co. Ltd. addressing the objection that their plugs are not made in Great Britain. | 7th Sep 1937 | Box 162 \ 3 img100 | |
| Photograph of the Champion Sparking Plug Company factory. | 9th Sep 1937 | Box 162 \ 3 img101 | |
| To order N.A.8 and L.B.8 type plugs from the Champion Sparking Plug Co. Ltd. | 9th Sep 1937 | Box 162 \ 3 img102 | |
| Letter to Champion Sparking Plug Co. Ltd. declining a recommendation but ordering 2 sets of their plugs for testing on the latest chassis. | 10th Sep 1937 | Box 162 \ 3 img103 | |
| Letter from Champion Sparking Plug Co. Ltd. confirming an order for spark plugs and terminals. | 20th Sep 1937 | Box 162 \ 3 img104 | |
| Letter from Champion Sparking Plug Co. Ltd. requesting a report on tested plugs and advice for their new recommendation chart for 1938. | 15th Nov 1937 | Box 162 \ 3 img105 | |
| Testing of three different sets of sparking plugs for the Wraith model. | 16th Nov 1937 | Box 162 \ 3 img106 | |
| Order request for sparking plugs from the Champion Sparking Plug Co. | 4th Dec 1937 | Box 162 \ 3 img107 | |
| Notes on the performance and wear of spark plugs and other ignition components on cars 6.B.IV & 26.G.VI. | 2nd Mar 1938 | Box 162 \ 3 img108 | |
| The testing and replacement of spark plugs and other components at various mileages. | 11th Mar 1938 | Box 162 \ 3 img109 | |
| Letter from Champion Sparking Plug Co. Ltd. regarding the official approval of their products for advertising purposes. | 22th Mar 1938 | Box 162 \ 3 img110 | |
| Letter to Champion Sparking Plug Co. inquiring about the manufacturing location of their insulators. | 23th Mar 1938 | Box 162 \ 3 img111 | |
| Letter to Champion Sparking Plug Co. Ltd. enquiring about the manufacturing origin of their insulators. | 23th Mar 1938 | Box 162 \ 3 img112 | |
| Promotional leaflet for E.R. sparking plugs, explaining their benefits, pricing, and maintenance. | 26th Apr 1938 | Box 162 \ 3 img113 | |
| Letter detailing the dispatch and fitting instructions for 'NER-MIS' adaptors. | 26th Apr 1938 | Box 162 \ 3 img114 | |
| The investigation and diagnosis of engine misfires on a customer's car. | 6th May 1938 | Box 162 \ 3 img115 | |
| Faulty plug and coil being brought in for examination, while other parts were left fitted to the car. | 6th May 1938 | Box 162 \ 3 img116 | |
| Letter from Champion Sparking Plug Co. Ltd. requesting permission to state their plugs are 'Officially Tested and Approved' in their literature. | 9th May 1938 | Box 162 \ 3 img117 | |
| | | | |
