| Description | Date | Identifier | |
| Letter from British Insulated Cables Ltd. concerning the supply and specifications of ignition cables. | 2nd Apr 1937 | Box 167 \ 3 img022 | |
| Letter from a supplier discussing samples of Buna and Thiokol synthetic rubbers. | 6th Apr 1937 | Box 167 \ 3 img023 | |
| Inferior grade of H.T. ignition cables supplied by a third party. | 9th Apr 1937 | Box 167 \ 3 img024 | |
| Follow-up letter from a supplier chasing the return of a 12-volt H.T. Ignition Coil for testing purposes. | 13th Apr 1937 | Box 167 \ 3 img025 | |
| Letter to British Insulated Cables Ltd. regarding faulty coils and the calibration of their ozone test equipment. | 14th Apr 1937 | Box 167 \ 3 img026 | |
| The specification for chassis H.T. ignition cables. | 15th Apr 1937 | Box 167 \ 3 img027 | |
| Specification for H.T. ignition cables for R.R. and Bentley chassis engines. | 17th Apr 1937 | Box 167 \ 3 img028 | |
| The standardisation of Erinoid ferrules for ignition wires. | 17th Apr 1937 | Box 167 \ 3 img029 | |
| Letter to British Insulated & Helsby Cables Ltd. regarding unsatisfactory ignition cable and the introduction of a new specification, No.EL.9. | 19th Apr 1937 | Box 167 \ 3 img030 | |
| Recommendation to use new ferrules for ignition wires following successful testing on a Phantom III chassis. | 19th Apr 1937 | Box 167 \ 3 img031 | |
| Letter to British Insulated Cables Limited regarding ignition cable specifications. | 21th Apr 1937 | Box 167 \ 3 img032 | |
| Production failures of Chassis H.T. Cables and the implementation of new testing specifications. | 23th Apr 1937 | Box 167 \ 3 img033 | |
| Letter to British Insulated Cables Ltd. requesting a change in the packing of H.T. cables for inspection purposes. | 23th Apr 1937 | Box 167 \ 3 img034 | |
| The return of faulty Helsby Cables to the makers for free replacement. | 26th Apr 1937 | Box 167 \ 3 img035 | |
| Potentially faulty H.T. cables and a request for samples for testing. | 28th Apr 1937 | Box 167 \ 3 img037 | |
| Letter to British Insulated Cables Ltd. regarding coils and a drawing for spark gap details. | 29th Apr 1937 | Box 167 \ 3 img038 | |
| Request to send two standard Phantom III ignition coils to British Insulated Cables Ltd. | 29th Apr 1937 | Box 167 \ 3 img039 | |
| Internal memorandum regarding the distribution and application of electrical specifications to manufacturers. | 30th Apr 1937 | Box 167 \ 3 img040 | |
| Letter from British Insulated Cables Ltd. arranging a visit to inspect H.T. Ignition Cable under test. | 30th Apr 1937 | Box 167 \ 3 img041 | |
| Request for a covering order for 500 yards of 7 mm H.T. ignition cable from Messrs Johnson & Phillips Ltd. | 1st May 1937 | Box 167 \ 3 img042 | |
| The rejection of poor quality Helsby H.T. Cable stock to avoid a production standstill. | 1st May 1937 | Box 167 \ 3 img043 | |
| Faulty H.T. ignition cable supplied by the British Insulated Cable Co. and the steps for rectification. | 3rd May 1937 | Box 167 \ 3 img044 | |
| The use of existing high tension ignition cable stock until a replacement supply arrives. | 4th May 1937 | Box 167 \ 3 img045 | |
| Request to despatch H.T. cable to Messrs. Lucas for laboratory testing. | 6th May 1937 | Box 167 \ 3 img046 | |
| Requesting the testing of a sample of 'Permel' copper wire from a new supplier. | 7th May 1937 | Box 167 \ 3 img047 | |
| Letter from British Insulated Cables Ltd. concerning the composition and testing of high tension ignition cable samples. | 28th May 1937 | Box 167 \ 3 img048 | |
| Letter to a supplier regarding the high cost and specification of an ozone-proof ignition cable for R.R. and Bentley chassis. | 29th May 1937 | Box 167 \ 3 img049 | |
| Letter from Johnson & Phillips Ltd regarding a price quotation for High Tension Ignition Cable. | 31th May 1937 | Box 167 \ 3 img050 | |
| Chasing the supply of new Helsby high tension ignition cable. | 1st Jun 1937 | Box 167 \ 3 img052 | |
| Letter to Johnson & Phillips Ltd. clarifying specifications for Neoprene cable for cars versus aero engines. | 2nd Jun 1937 | Box 167 \ 3 img053 | |
| Confirming that reels of B.I. H.T. Cable have passed tests and may be issued to production. | 2nd Jun 1933 | Box 167 \ 3 img054 | |
| Letter concerning the return of a print for spark gap settings and a translation of a Bosch instruction. | 2nd Jun 1937 | Box 167 \ 3 img055 | |
| Approving a new batch of H.T. Ignition Cable and arranging for the return of old stock. | 2nd Jun 1937 | Box 167 \ 3 img056 | |
| Request for a new supply of H.T. Ignition Cable and the return of existing stock. | 3rd Jun 1937 | Box 167 \ 3 img057 | |
| Letter to a supplier clarifying the specification of an H.T. cable order. | 4th Jun 1937 | Box 167 \ 3 img058 | |
| Letter from Johnson & Phillips Ltd. explaining they cannot reduce the price of Ozone-proof Ignition Wire without compromising its quality. | 4th Jun 1937 | Box 167 \ 3 img059 | |
| Letter from Johnson & Phillips, Ltd. confirming the conductor size of a high tension cable. | 7th Jun 1937 | Box 167 \ 3 img060 | |
| Responding to a complaint regarding high tension wire. | 7th Jun 1937 | Box 167 \ 3 img061 | |
| The procurement of High Tension Wire. | 7th Jun 1937 | Box 167 \ 3 img062 | |
| Follow-up memo regarding a complaint about faulty high tension wire at Cricklewood Depot. | 8th Jun 1937 | Box 167 \ 3 img063 | |
| Confirming that a batch of BW cable has passed testing and is approved for production. | 8th Jun 1937 | Box 167 \ 3 img064 | |
| Letter from British Insulated Cables Ltd discussing the specifications for a Twin Ignition Cable and proposing an alternative construction. | 11th Jun 1937 | Box 167 \ 3 img065 | |
| Despatching a Spark Gap Instrument to British Helsby Cables Ltd after a calibration test. | 14th Jun 1937 | Box 167 \ 3 img066 | |
| Request to send a spark gap to British Helsby Cables Ltd. for calibration. | 14th Jun 1937 | Box 167 \ 3 img067 | |
| Letter to British Insulated Cables Ltd. regarding the calibration of a spark gap and the excessive erosion of its points. | 14th Jun 1937 | Box 167 \ 3 img068 | |
| Confirming that B.I. Cables have passed the required tests and are approved for production use. | 15th Jun 1937 | Box 167 \ 3 img069 | |
| Follow-up on an unfulfilled order for High Tension Ignition Cable, resulting in the use of condemned material. | 16th Jun 1937 | Box 167 \ 3 img070 | |
| Letter from British Insulated Cables Ltd. regarding the calibration of a spark gap. | 17th Jun 1937 | Box 167 \ 3 img071 | |
| Confirming receipt of new H.T. ignition cable and the return of old stock. | 18th Jun 1937 | Box 167 \ 3 img072 | |
| Urgent supply of H.T. Ignition Cable for the Cricklewood branch. | 19th Jun 1937 | Box 167 \ 3 img073 | |
| Confirming the despatch of 3,000 feet of High Tension Ignition Cable. | 21th Jun 1937 | Box 167 \ 3 img074 | |
| Confirming 10 reels of B.I. Cables have passed the required tests and can be issued for production. | 22th Jun 1937 | Box 167 \ 3 img075 | |
| The test results for B.I. H.T. Ignition Cables, noting that reel B.I.123 failed the ionization test. | 30th Jun 1931 | Box 167 \ 3 img076 | |
| The test results of B.I. High Tension Ignition Cable reels. | 6th Jul 1937 | Box 167 \ 3 img077 | |
| Test results for B.I. Helsby High Tension Cables, noting one reel failed the ionization test and must be returned. | 15th Jul 1937 | Box 167 \ 3 img078 | |
| Notification that 10 reels of B.I. Helsby High Tension Cable have passed tests and can be issued to production. | 3rd Aug 1937 | Box 167 \ 3 img079 | |
| Test results for B.I. Helsby High Tension Cable reels. | 12th Aug 1937 | Box 167 \ 3 img080 | |
| Confirming that reels of B.I. Helsby High Tension Cable have passed tests and can be issued to production. | 20th Aug 1937 | Box 167 \ 3 img081 | |
| Comparative test results of standard ignition H.T. cable versus a new experimental type from Johnson and Phillip. | 30th Aug 1937 | Box 167 \ 3 img082 | |
| Specific type of cable used for wiring inlet and exhaust plugs on a 32EX. | 30th Aug 1937 | Box 167 \ 3 img083 | |
| Authorizing the issue of B.I. High Tension Cable reels to production after passing tests. | 30th Aug 1937 | Box 167 \ 3 img084 | |
| Letter from Wiggin & Company advising on the unsuitability of Brightray wire and recommending oxidised Ferry wire for resistances. | 27th Aug 1937 | Box 167 \ 3 img085 | |
| On the standardisation and testing of 'Neoprene' High Tension Cable for Johnson and Philips. | 7th Sep 1937 | Box 167 \ 3 img086 | |
| Standardisation of parts report for a Neoprene Ozone Resisting H.T. Ignition Cable. | 2nd Jun 1937 | Box 167 \ 3 img087 | |
| Standardization parts document for a Bentley ignition cable, detailing costs and production implementation. | 21th Sep 1936 | Box 167 \ 3 img088 | |
| Standardisation of Johnson & Phillips 'Neoprene' ozone resisting H.T. ignition cable for the Phantom III. | 2nd Jun 1937 | Box 167 \ 3 img089 | |
| Standardisation report for a 'Brougham' luggage grid on the Phantom II chassis for production in the 'E' Series. | 16th May 1930 | Box 167 \ 3 img090 | |
| Standardisation of Johnson & Phillips 'Neoprene' Ozone Resisting H.T. Ignition Cable. | 8th Jul 1937 | Box 167 \ 3 img091 | |
| Tool cost and production commencement for the 'S2' Series chassis. | 17th Sep 1937 | Box 167 \ 3 img092 | |
| Letter from Johnson & Phillips Ltd. regarding cable specification EL.9/1 and requesting details for an ionization test apparatus. | 17th Sep 1937 | Box 167 \ 3 img093 | |
| Letter to Johnson & Phillips Ltd. regarding the successful ionization testing of their cable and details of the apparatus used. | 5th Oct 1937 | Box 167 \ 3 img094 | |
| Letter from Johnson & Phillips acknowledging a recent enquiry and confirming a satisfactory cable test. | 6th Oct 1937 | Box 167 \ 3 img095 | |
| The test results for BI H.T. Ignition Cable reels, noting which have passed or failed inspection. | 11th Oct 1937 | Box 167 \ 3 img096 | |
| The results of a heating test on reels of H.T. cables, identifying which passed and which failed. | 19th Oct 1937 | Box 167 \ 3 img097 | |
| Letter from Johnson & Phillips Limited regarding a price quotation for Ignition Coils. | 15th Nov 1937 | Box 167 \ 3 img098 | |
| Letter responding to an enquiry about supplying a coil for an ionization test rig. | 18th Nov 1937 | Box 167 \ 3 img099 | |
| Confirming that 15 reels of B.I. High Tension Cables have passed tests and may be issued for production. | 3rd Dec 1937 | Box 167 \ 3 img100 | |
| Requesting the replacement of H.T. cables for a Phantom III No.6 Unit engine. | 14th Jan 1938 | Box 167 \ 3 img101 | |
| Test results for B.I. High Tension Cable, noting one reel failed the ionization test. | 7th Feb 1938 | Box 167 \ 3 img102 | |
| Confirming 10 reels of B.I. High Tension Wire have passed tests and are cleared for production. | 18th Feb 1938 | Box 167 \ 3 img103 | |
| Confirming that 10 reels of B.I. High tension cable have passed tests and can be issued to production. | 10th Mar 1938 | Box 167 \ 3 img104 | |
| Test results for B.I. High Tension Cable reels, indicating which have passed or failed. | 31th Mar 1938 | Box 167 \ 3 img105 | |
| Letter from a supplier requesting clarification on test procedures for an ignition coil spark-gap. | 4th May 1938 | Box 167 \ 3 img106 | |
| Letter to Messrs, Johnson & Phillips Ltd. regarding an ionization test and spark gap calibration. | 12th May 1938 | Box 167 \ 3 img107 | |
| Follow-up letter from Johnson & Phillips regarding queries on specification E.L. 9/1. | 13th May 1938 | Box 167 \ 3 img108 | |
| Letter to Johnson & Phillips Ltd. regarding oversized High Tension wire which is unsuitable for production. | 17th May 1938 | Box 167 \ 3 img109 | |
| Internal memorandum regarding Johnson & Phillips H.T. cable being oversized and unsuitable for the Phantom III chassis. | 17th May 1938 | Box 167 \ 3 img110 | |
| Letter from Johnson & Phillips Ltd. regarding difficulties in manufacturing a specific cable for replacement order R. 16835. | 21th May 1938 | Box 167 \ 3 img111 | |
| Letter from a supplier regarding difficulties in fulfilling a cable order due to a fire at their raw material source. | 18th May 1938 | Box 167 \ 3 img112 | |
| Letter from a cable supplier discussing the return of four out of five supplied high-tension wire reels. | 18th May 1938 | Box 167 \ 3 img113 | |
| The test results and status of various reels of B.I. High Tension Cable. | 1st Jul 1938 | Box 167 \ 3 img114 | |
| Modification to the distributor wiring and ignition tube for the Wraith III and Bentley 111 models. | 13th Jul 1938 | Box 167 \ 3 img115 | |
| Letter from British Insulated Cables Ltd. responding to a request for a sample of H.T. Ignition Cable. | 18th Jul 1938 | Box 167 \ 3 img116 | |
| Request for a further sample of H.T. Ignition Cable from a supplier as the previous sample was insufficient for testing. | 12th Jul 1938 | Box 167 \ 3 img117 | |
| Letter from British Insulated Cables Ltd. concerning a sample of H.T. Ignition Cable for R.R. and Bentley Chassis. | 25th Jun 1938 | Box 167 \ 3 img118 | |
| The conversion of distributor wiring tubes for Wraith III and Bentley III engines. | 18th Aug 1938 | Box 167 \ 3 img119 | |
| The modification to the front ignition tube for the Delco Distributor on Wraith III and Bentley III models. | 13th Jul 1938 | Box 167 \ 3 img120 | |
| Request for 100 ft. of B.I. insulated Neoprene 7 m/m H.T. cable for final testing on experimental engines. | 26th Aug 1938 | Box 167 \ 3 img121 | |
| Instruction regarding distributor wiring for the Wraith III and Bentley 11 models. | 31th Aug 1938 | Box 167 \ 3 img122 | |
| Suggested threaded design for Phantom III H.T. wire plug terminals. | 31th Aug 1938 | Box 167 \ 3 img123 | |
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