| Description | Date | Identifier | |
| Standardisation of K.L.G. 'CORDUNDITE' Plugs Type FE.30X for the Phantom III. | 13th Apr 1937 | Box 162 \ 4 img299 | |
| Standardisation of the 'Commodius' Plug, Type 30X, for the Phantom III model. | 14th Apr 1937 | Box 162 \ 4 img300 | |
| Returning a faulty and previously repaired electrical horn diaphragm disc for inspection. | 20th Apr 1937 | Box 162 \ 4 img301 | |
| Arranging the supply of K.L.G. sparking plugs for testing and experience gathering. | 22th Apr 1937 | Box 162 \ 4 img302 | |
| Requesting K.L.G. plugs to be sent to I.M. Waller for various engine types. | 22th Apr 1937 | Box 162 \ 4 img303 | |
| Confirming the despatch of K.L.G. sparking plugs to France for testing. | 23th Apr 1937 | Box 162 \ 4 img304 | |
| Dispatch of K.L.G. sparking plugs for testing on car 6-B-IV in France. | 23th Apr 1937 | Box 162 \ 4 img305 | |
| Sending K.L.G. sparking plugs to France for testing on Chassis No. 35-Ex. | 23th Apr 1937 | Box 162 \ 4 img306 | |
| The performance and replacement of K.L.G. sparking plugs for a Phantom III vehicle. | 27th Apr 1937 | Box 162 \ 4 img307 | |
| The performance of different sparking plugs on the Peregrine model during road tests. | 15th May 1933 | Box 162 \ 4 img308 | |
| Investigation into engine misfires caused by K.L.G. sparking plugs on cars 36-EX and 5-B-IV. | 23th Apr 1937 | Box 162 \ 5 img001 | |
| Letter from K.L.G Sparking Plugs Limited regarding the development and supply of new experimental spark plugs for testing. | 29th Apr 1937 | Box 162 \ 5 img002 | |
| Letter from K.L.G. Sparking Plugs Limited concerning manufacturing difficulties with Corundite plugs. | 29th Apr 1937 | Box 162 \ 5 img003 | |
| Letter from K.L.G Sparking Plugs acknowledging the return of fifteen type R-868 electrodes. | 9th Apr 1937 | Box 162 \ 5 img004 | |
| Investigation into engine misfires on two cars traced to K.L.G. sparking plugs. | 23th Apr 1937 | Box 162 \ 5 img005 | |
| Replacement of K.L.G. sparking plugs on engine 37-EX due to a misfire caused by large gaps. | 26th Apr 1937 | Box 162 \ 5 img006 | |
| Engine misfires on plugs due to burnt points. | 11th May 1937 | Box 162 \ 5 img007 | |
| The testing of K.L.G. sparking plugs, finding that reducing the plug gap resolves poor running issues. | 21th May 1937 | Box 162 \ 5 img008 | |
| Dispatch note from K.L.G. Sparking Plugs Limited regarding 'Corundite' plugs with copper electrodes. | 21th May 1937 | Box 162 \ 5 img009 | |
| Letter from K.L.G Sparking Plugs regarding the supply of special F.E.30x plugs for testing. | 21th May 1937 | Box 162 \ 5 img010 | |
| Arranging payment and credit notes for two different types of K.L.G. sparking plugs supplied for testing. | 24th May 1937 | Box 162 \ 5 img011 | |
| Letter of complaint to K.L.G. Sparking Plug Ltd. regarding gas leakage from new Corundite spark plugs. | 25th May 1937 | Box 162 \ 5 img012 | |
| Letter from K.L.G Sparking Plugs Limited regarding gas leakage issues with Corundite plugs. | 26th May 1937 | Box 162 \ 5 img013 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting more plugs for testing due to serious point burning issues. | 27th May 1937 | Box 162 \ 5 img014 | |
| K.L.G.E.26 sparking plugs burning away too quickly from car 36-EX. | 27th May 1937 | Box 162 \ 5 img015 | |
| The performance and wear of K.L.G. sparking plugs after testing in a 36-EX vehicle. | 26th May 1937 | Box 162 \ 5 img016 | |
| The use of leftover K.L.G. type 850 sparking plugs on Bentley chassis. | 28th May 1937 | Box 162 \ 5 img017 | |
| Testing of two K.L.G. sparking plugs returned for misfiring. | 5th Jun 1937 | Box 162 \ 5 img018 | |
| The change of sparking plugs being fitted to Bentley Chassis. | 8th Jun 1937 | Box 162 \ 5 img019 | |
| Visit to K.L.G. to discuss failures and design improvements for Corundite insulated aero sparking plugs. | 9th Jun 1937 | Box 162 \ 5 img020 | |
| Cracked insulators and gas leakage in spark plugs, referencing Bosch, K.L.G., and Corundite development. | 9th Jun 1937 | Box 162 \ 5 img021 | |
| Design update for mica plugs, featuring a longer threaded gland portion for improved heat transference on the Eagle 26. | 9th Jun 1937 | Box 162 \ 5 img022 | |
| The testing and replacement of K.L.G. sparking plugs taken from vehicle 35-EX. | 16th Jun 1937 | Box 162 \ 5 img023 | |
| Letter to K.L.G. Sparking Plugs Ltd requesting four dozen spark plugs for testing new plug positions on 25/30 and Bentley chassis. | 30th Jun 1937 | Box 162 \ 5 img024 | |
| Examination report on the performance and condition of K.L.G. sparking plugs after testing. | 2nd Jul 1937 | Box 162 \ 5 img025 | |
| Letter from K.L.G. Sparking Plugs regarding the supply of plugs for 25/30 and Bentley engines. | 5th Jul 1937 | Box 162 \ 5 img026 | |
| Unsatisfactory performance and misfiring issues related to K.L.G. sparking plugs on a Phantom III vehicle. | 9th Jul 1937 | Box 162 \ 5 img027 | |
| Failed K.L.G. sparking plug on a Phantom III vehicle. | 10th Jul 1937 | Box 162 \ 5 img028 | |
| Burnt central electrodes in K.L.G. Sparking Plugs (Type FE.30. X) from a 32-EX Phantom III. | 15th Jul 1937 | Box 162 \ 5 img029 | |
| The failure of K.L.G. sparking plugs in a Phantom III vehicle. | 15th Jul 1937 | Box 162 \ 5 img030 | |
| The failure of K.L.G. sparking plugs in a Phantom III vehicle, model 32-EX. | 17th Jul 1937 | Box 162 \ 5 img031 | |
| Letter from the Experimental Department confirming a telegram order for spark plugs. | 17th Jul 1937 | Box 162 \ 5 img032 | |
| Request to dispatch a set of K.L.G. type sparking plugs for a 32-EX Phantom III chassis. | 28th Jul 1937 | Box 162 \ 5 img033 | |
| Sending K.L.G. spark plugs to Mr. I.M. Waller in France for testing on a PH.III 32-EX chassis. | 28th Jul 1937 | Box 162 \ 5 img034 | |
| Return of six Bentley FLB30X spark plugs after an investigation into a misfiring complaint. | 21th Sep 1937 | Box 162 \ 5 img035 | |
| Letter regarding the performance and examination of K.L.G. sparking plugs after misfiring issues due to excessive lead deposit. | 30th Jul 1937 | Box 162 \ 5 img036 | |
| The failure of sparking plugs due to cracked insulators and the fitting of a new roller bearing to the dynamo. | 1st Aug 1937 | Box 162 \ 5 img037 | |
| Sending three failed K.L.G. sparking plugs, an A.C. plug, and a returned roller bearing. | 1st Aug 1937 | Box 162 \ 5 img038 | |
| Letter from K.L.G. Sparking Plugs confirming the dispatch of four dozen F.L.30x model plugs. | 18th Aug 1937 | Box 162 \ 5 img039 | |
| Payment authorisation for an invoice from K.L.G. Sparking Plugs Ltd. | 20th Aug 1937 | Box 162 \ 5 img040 | |
| The performance and issues with a set of 14 m/m Cormundite ignition plugs over 10,000 miles. | 21th Aug 1938 | Box 162 \ 5 img041 | |
| The handover of K.L.G. special Short Reach Corundite Plugs for testing on an experimental chassis. | 23th Aug 1937 | Box 162 \ 5 img042 | |
| Request to arrange a covering order for 48 K.L.G. type FL.30X sparking plugs. | 23th Aug 1937 | Box 162 \ 5 img043 | |
| The handover of K.L.G. special short reach corundite plugs for testing. | 23th Aug 1937 | Box 162 \ 5 img044 | |
| Trial of K.L.G. F.50.X sparking plugs on a Phantom III unit due to pre-ignition issues. | 24th Aug 1937 | Box 162 \ 5 img045 | |
| The trial of new K.L.G. FL.30X sparking plugs for the Wraith and Bentley III chassis. | 24th Aug 1937 | Box 162 \ 5 img046 | |
| The testing and performance of various K.L.G. sparking plugs. | 10th Sep 1937 | Box 162 \ 5 img047 | |
| Resolving engine misfires on a Wraith by testing and comparing different ignition coils. | 30th Sep 1937 | Box 162 \ 5 img048 | |
| The performance and wear of FE30XC spark plugs after extended engine testing. | 15th Oct 1937 | Box 162 \ 5 img049 | |
| The performance and failure of F50 K.L.G. sparking plugs fitted to vehicle 3SEX. | 25th Oct 1937 | Box 162 \ 5 img050 | |
| The performance and wear of K.L.G. 50x sparking plugs. | 25th Oct 1937 | Box 162 \ 5 img051 | |
| Inspection note detailing the removal of part 'E 24's' and the fitting of part 'FL 30X'. | 11th Dec 1937 | Box 162 \ 5 img052 | |
| The failure of a set of M.L.G. F.H.R. 30X sparking plugs after completing 11,680 miles. | 11th Dec 1937 | Box 162 \ 5 img053 | |
| Ignition plug tests comparing K.L.G. and Champion plugs on chassis 21.G.IV. | 14th Dec 1937 | Box 162 \ 5 img054 | |
| Request to despatch K.L.G. sparking plugs as spares for car 6.B.IV. | 28th Feb 1938 | Box 162 \ 5 img055 | |
| Request to dispatch six K.L.G. spark plugs to Mr. I.M. Waller in France for a Bentley Chassis 6-B-IV undergoing 15,000-mile trials. | 28th Feb 1938 | Box 162 \ 5 img056 | |
| Complaints of Bentley K.L.G. FLB.30X plugs burning the points. | 8th Apr 1938 | Box 162 \ 5 img057 | |
| Customer issues with K.L.G. Corundite plugs, arranging for an inspection of modified plugs. | 29th Apr 1938 | Box 162 \ 5 img058 | |
| Letter from K.L.G. Sparking Plugs Ltd. regarding point erosion issues with 'Corundite' plugs. | 22th Apr 1938 | Box 162 \ 5 img059 | |
| Burnt KLG ignition plugs on a Phantom III chassis that was used on the Continent. | 2nd May 1938 | Box 162 \ 5 img060 | |
| Letter to K.L.G. Co. Ltd. regarding point erosion on spark plugs and arranging a visit to discuss testing. | 11th Jun 1938 | Box 162 \ 5 img061 | |
| Letter from K.L.G. Sparking Plugs Limited regarding the supply of new FLB.50x spark plugs for testing. | 14th Jun 1938 | Box 162 \ 5 img062 | |
| 'Corundite' plugs sent for testing. | 14th Jun 1938 | Box 162 \ 5 img063 | |
| Issues with Bentley KLG.FLB30X plugs burning out and requesting the status of new test plugs. | 14th Jun 1938 | Box 162 \ 5 img064 | |
| Requesting one set of K.L.G. FLB.50.X sparking plugs to be forwarded. | 15th Jun 1938 | Box 162 \ 5 img065 | |
| The receipt and forwarding of a set of KLG.FLB.50.X plugs. | 15th Jun 1938 | Box 162 \ 5 img066 | |
| Forwarding six K.L.G. FLB.50 sparking plugs to Kingsbury for testing. | 16th Jun 1938 | Box 162 \ 5 img067 | |
| Requesting the despatch of KLG.FLB.50.X sparking plugs for trial use on a Bentley. | 17th Jun 1938 | Box 162 \ 5 img068 | |
| Despatch of two sets of KLG.FLB.50.X spark plugs for trial on a Bentley car. | 17th Jun 1938 | Box 162 \ 5 img069 | |
| Fitting of six KLG.FIB.50.X plugs to a customer's car. | 20th Jun 1938 | Box 162 \ 5 img070 | |
| Investigation into popping back caused by faulty K.L.G. sparking plugs. | 20th Jun 1938 | Box 162 \ 5 img071 | |
| The forwarding of special K.L.G. sparking plugs to the Paris Depot for testing. | 21th Jun 1938 | Box 162 \ 5 img072 | |
| Letter to K.L.G. Sparking Plugs Ltd. regarding FLB.50.X sparking plugs and a proposed visit. | 22th Jun 1938 | Box 162 \ 5 img073 | |
| Letter from K.L.G. Sparking Plugs Limited arranging travel details for a visit from Mr. Child. | 23th Jun 1938 | Box 162 \ 5 img074 | |
| Letter to K.L.G. Sparking Plugs Ltd. confirming travel arrangements for a visit. | 25th Jun 1938 | Box 162 \ 5 img075 | |
| Return of 'Nermiss' plug adaptors after testing. | 27th Jun 1938 | Box 162 \ 5 img076 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting a trial supply of a new type of sparking plug. | 20th Jul 1938 | Box 162 \ 5 img077 | |
| Letter from K.L.G. Sparking Plugs regarding the testing and production of Corundite plugs. | 25th Jul 1938 | Box 162 \ 5 img078 | |
| Letter to K.L.G. Sparking Plugs Ltd. requesting detachable plugs to test against overoiling issues on new engines. | 5th Aug 1938 | Box 162 \ 5 img079 | |
| Letter from K.L.G Sparking Plugs Limited regarding an order for FE.30x and FLB.50x plugs. | 9th Aug 1938 | Box 162 \ 5 img080 | |
| Dispatch note from K.L.G. Sparking Plugs Limited for 'Corundite' plugs. | 9th Aug 1938 | Box 162 \ 5 img081 | |
| Discrepancy in recommended KLG Corundite spark plugs for Bentley and Phantom III models. | 19th Aug 1938 | Box 162 \ 5 img082 | |
| Letter to KLG Sparking Plugs Ltd. regarding an incorrect spark plug recommendation for the 3 1/2-litre Bentley. | 31th Aug 1938 | Box 162 \ 5 img083 | |
| Letter from K.L.G Sparking Plugs Limited regarding an error on their 1938 Plug Recommendation Chart for the 3½-litre Bentley. | 2nd Sep 1938 | Box 162 \ 5 img084 | |
| Trial of FLB.50.X type plugs on a Bentley car under continental conditions. | 7th Sep 1938 | Box 162 \ 5 img085 | |
| Performance of K.L.G. FLB.50X ignition plugs fitted to a customer's Bentley. | 12th Sep 1938 | Box 162 \ 5 img086 | |
| Letter apologising for a delay in replying to an enquiry about FLB-50X type sparking plugs. | 21th Sep 1938 | Box 162 \ 5 img087 | |
| The performance and comparison of F.L.B.50.X type sparking plugs after use in a trials car. | 29th Sep 1938 | Box 162 \ 5 img088 | |
| Troubleshooting a recurring misfire caused by an oiled-up number 6 spark plug. | 25th Oct 1938 | Box 162 \ 5 img089 | |
| Testing F.L.B. 50.X Type Sparking plugs, finding no improvement over the F.L.B. 30.X type. | 17th Nov 1938 | Box 162 \ 5 img090 | |
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