| Description | Date | Identifier | |
| Oil lubrication concerns and proposed modifications for an adjustable carrier wheel. | 7th Apr 1928 | Box 56 \ 3 Scan062 | |
| Note about sending blueprint LeC.2546 for a modification to the lubricating system of the 'India 3' carrier wheel. | 7th Apr 1928 | Box 56 \ 3 Scan063 | |
| Suggestion to hold production of the 20-HP Wheelcase due to a rattling issue. | 19th Apr 1932 | Box 56 \ 3 Scan064 | |
| Standardisation of a wheel case to suit a low inertia spring drive. | 4th Jan 1932 | Box 56 \ 3 Scan065 | |
| Standardisation sheet for a chassis part, specifically the wheel case and propshaft drive. | 4th Jan 1932 | Box 56 \ 3 Scan066 | |
| Reintroducing friction pads to the U. Series 20/25 Chassis wheelcase to prevent gear rattle. | 26th Apr 1932 | Box 56 \ 3 Scan067 | |
| Modifications to the 'Goshawk' temporary controls under Scheme 664. | 22th Dec 1920 | Box 56 \ 3 Scan068 | |
| Request to make a model of a 'GOSHAWK II' small ball joint for controls from drawing Lec.1387 for Mr. Royce. | 13th May 1921 | Box 56 \ 3 Scan069 | |
| Instructions for fixing a model ball joint for Mr. Royce's lever end on the Goshawk II controls. | 23th May 1921 | Box 56 \ 3 Scan070 | |
| Modifications to the 'Goshawk II' Klaxon button switch and controls on the steering column. | 14th Jun 1921 | Box 56 \ 3 Scan071 | |
| Revised design schemes for the 'Goshawk II' small ball joint for controls. | 1st Jul 1921 | Box 56 \ 3 Scan072 | |
| Confirmation of a telegram regarding a defective dashboard and modifications to a universal joint for Goshawk TT. | 1st Sep 1921 | Box 56 \ 3 Scan073 | |
| Goshawk 11 controls, suggesting the parts could be made from brass castings. | 3rd Sep 1921 | Box 56 \ 3 Scan074 | |
| Drawings for the Goshawk 11 control gear, including throttle and ignition controls. | 9th Sep 1921 | Box 56 \ 3 Scan075 | |
| Drawing and modifications to the Goshawk 11 control gear. | 9th Sep 1921 | Box 56 \ 3 Scan076 | |
| Progress and handover of drawings for the 'Goshawk 11' control mechanism. | 20th Sep 1921 | Box 56 \ 3 Scan077 | |
| The operating principle of the Goshawk 11 double throttle controls. | 22th Sep 1921 | Box 56 \ 3 Scan078 | |
| Modifications to the Goshawk 11 carburetter silencer, control gear, and petrol feed connections. | 29th Oct 1921 | Box 56 \ 3 Scan079 | |
| Modifications to the Goshawk 11 engine controls and mixture/starting cock connections. | 21th Dec 1921 | Box 56 \ 3 Scan080 | |
| The adaptation of the Goshawk 11 magneto control gear. | 1st Feb 1922 | Box 56 \ 3 Scan081 | |
| Reduction of different engine lever parts and the upcoming magneto wiring scheme. | 23th Mar 1922 | Box 56 \ 3 Scan082 | |
| Feedback on the Goshawk car's carburetter and ignition controls. | 23th Mar 1922 | Box 56 \ 3 Scan083 | |
| Continued correspondence seeking feedback on a proposed compromise to address potential criticisms. | 15th Mar 1917 | Box 56 \ 3 Scan084 | |
| Design issue with the carburetter control operating gear on the instrument board. | 24th Apr 1922 | Box 56 \ 3 Scan085 | |
| Goshawk 11 starting carburetter and mixture control on the instrument board. | 10th May 1922 | Box 56 \ 3 Scan086 | |
| Two modifications to the Goshawk 11 control gear. | 11th May 1922 | Box 56 \ 3 Scan087 | |
| Alterations to the Goshawk 11 carburetter controls and throttle linkage. | 5th May 1922 | Box 56 \ 3 Scan088 | |
| Material and design specifications for Goshawk steering column controls and instrument board screws. | 1st Jun 1922 | Box 56 \ 3 Scan089 | |
| Modifications and material issues for the Goshawk steering column controls. | 14th Jun 1922 | Box 56 \ 3 Scan090 | |
| Redesign of the Goshawk engine's throttle control to improve delicate operation. | 23th Jun 1922 | Box 56 \ 3 Scan091 | |
| Addition of a spring to the Goshawk limousine's throttle control to improve slow running. | 30th Jun 1922 | Box 56 \ 3 Scan092 | |
| The revised design for control lever springs on the Goshawk steering column to reduce hand knob load. | 30th Jun 1922 | Box 56 \ 3 Scan093 | |
| Difficulty of achieving a sensitive throttle control for the Goshawk engine due to butterfly valve friction. | 1st Jul 1922 | Box 56 \ 3 Scan094 | |
| Modifications to the Goshawk control gear and steering box support, including corrections to lever angles. | 1st Jul 1922 | Box 56 \ 3 Scan095 | |
| Instructions for producing parts for the Goshawk II carburetter controls and 12 1/2 degree throttle valve. | 16th Aug 1922 | Box 56 \ 3 Scan096 | |
| Engine control issues for the Goshawk 11 aircraft, causing the engine not to stop. | 3rd Nov 1922 | Box 56 \ 3 Scan097 | |
| Agreement to use modified throttle closing spring brackets on Goshawk II cylinder heads. | 3rd Nov 1922 | Box 56 \ 3 Scan098 | |
| Explaining the inability to work on Goshawk left-hand controls due to being fully engaged on other projects. | 16th Nov 1922 | Box 56 \ 3 Scan099 | |
| Requesting a 20 HP car or chassis fitted with dummy right-hand control levers for ergonomic evaluation. | 11th Jul 1923 | Box 56 \ 3 Scan100 | |
| Rigging of dummy right-hand control levers for a 20 HP car. | 13th Jul 1923 | Box 56 \ 3 Scan101 | |
| Proposal to take a 20 HP car with mock-up right-hand control levers to London for examination. | 8th Jul 1923 | Box 56 \ 3 Scan102 | |
| Confirming a previously agreed carburetter control modification for the 4-Goshawk-11 car. | 25th Jul 1923 | Box 56 \ 3 Scan103 | |
| The annealing of steel hollow rivetted control pins for the 20 HP Chassis. | 8th Jan 1924 | Box 56 \ 3 Scan104 | |
| Modification to the Goshawk 11 carburetter controls and a request for a new part to be made. | 7th Jul 1924 | Box 56 \ 3 Scan105 | |
| Proposed linkages for mixture control required for the fitting of shutters to a 20 HP model. | 6th Jan 1927 | Box 56 \ 3 Scan106 | |
| Modifications to the 20 HP radiator shutters and steering column. | 28th Jan 1927 | Box 56 \ 3 Scan107 | |
| Modifications to the mixture control, throttle, and ignition levers for 20 HP vertical shutters. | 4th Feb 1927 | Box 56 \ 3 Scan108 | |
| Arrangements for fitting vertical radiator shutters to a 10,000 miles car. | 2nd Feb 1927 | Box 56 \ 3 Scan109 | |
| The dispatch of original drawings for 20 HP controls, advising to await comments before proceeding. | 4th Mar 1927 | Box 56 \ 3 Scan110 | |
| Modification to the 20 HP controls for models with vertical shutters to resolve friction issues. | 5th Mar 1927 | Box 56 \ 3 Scan111 | |
| Unsatisfactory design of the 20 HP exhaust cutout and controls, noting wear and seizing issues. | 23th May 1927 | Box 56 \ 3 Scan112 | |
| Standardisation document for new controls on the instrument board. | 23th May 1927 | Box 56 \ 3 Scan113 | |
| Standardisation of chassis parts, noting tool costs for a radiator with integral shutters are included. | 22th Aug 1927 | Box 56 \ 3 Scan114 | |
| The standardisation of modified controls for shutters and starter carburetter on the 20 HP model. | 10th Oct 1927 | Box 56 \ 3 Scan115 | |
| Vibration issue with the 20 HP starter carburetter control, requesting a modification to increase friction. | 8th Nov 1928 | Box 56 \ 3 Scan116 | |
| Blueprint detailing a modification to an existing piece by adding a countersink. | 29th Nov 1928 | Box 56 \ 3 Scan117 | |
| Technical memorandum detailing a simplified throttle control scheme with an accompanying sketch. | 29th Nov 1928 | Box 56 \ 3 Scan118 | |
| Listing drawings sent for 20HP controls. | 13th Dec 1928 | Box 56 \ 3 Scan119 | |
| Two blueprint designs for a starter carburettor throttle control, recommending one over the other. | 22th Dec 1928 | Box 56 \ 3 Scan120 | |
| Confirming the dispatch of drawings LeC. 2627 and 2630 related to 'INDIA 4 - CONTROLS'. | 18th Jan 1929 | Box 56 \ 3 Scan121 | |
| Lowering steering column controls and standardizing larger steering wheels based on user feedback. | 23th Jan 1929 | Box 56 \ 3 Scan122 | |
| Adjustment for the radiator shutter and starting carburetter controls to suit varying scuttle depths. | 30th Apr 1930 | Box 56 \ 3 Scan123 | |
| The placement of the ignition control, referencing U.S.A. practice for the 'JAPAN' III model. | 5th Feb 1931 | Box 56 \ 3 Scan124 | |
| Flattened steering column controls and the incorporation of a headlamp dipping switch. | 23th Dec 1931 | Box 56 \ 3 Scan125 | |
| Arrangement of controls, instrument board, and component suppliers for the 'Japan 3' project. | 6th Feb 1931 | Box 56 \ 3 Scan126 | |
| The design change and removal procedure for the 20 HP chassis undershield. | 29th Mar 1919 | Box 56 \ 3 Scan127 | |
| Alterations to the engine undershield stiffeners and crossmember fixings. | 1st Mar 1919 | Box 56 \ 3 Scan128 | |
| Brief typed memo regarding the intention to start work on an undershield. | 8th Oct 1921 | Box 56 \ 3 Scan129 | |
| Engine undershield and half-time wheelcase for the Goshawk II project. | 12th Oct 1921 | Box 56 \ 3 Scan130 | |
| Alterations to the Goshawk 11 undershield detailed in drawing LeC.1482. | 19th Nov 1921 | Box 56 \ 3 Scan131 | |
| Enclosing drawing LeC.1491, showing a modification to the Goshawk 11 undershield for an altered front suspension. | 23th Nov 1921 | Box 56 \ 3 Scan132 | |
| Proposed modification to the Goshawk-11 undershield to prevent mud ingress. | 20th Apr 1922 | Box 56 \ 3 Scan133 | |
| Modifications to the Goshawk-11 undershield to prevent mud ingress. | 21th Apr 1922 | Box 56 \ 3 Scan134 | |
| Modifications to the Goshawk 11 undershield with reference to drawings LeC.1567 and LeC.1562. | 9th May 1922 | Box 56 \ 3 Scan135 | |
| Issues with undershield clearances and the cross member on the Goshawk model. | 1st Jun 1922 | Box 56 \ 3 Scan136 | |
| Design variation in the Goshawk's cross member and its packing piece, referencing an attached drawing. | 20th Jun 1923 | Box 56 \ 3 Scan137 | |
| Investigating a customer complaint about rust on a 20 HP chassis, caused by fitting untreated steel parts instead of sheradized ones. | 20th Jun 1923 | Box 56 \ 3 Scan138 | |
| List of sheradized parts and quantities for a 20 HP chassis. | 16th Aug 1923 | Box 56 \ 3 Scan139 | |
| Tests to reduce heat under the scuttle. | 16th Aug 1923 | Box 56 \ 3 Scan140 | |
| The issue of heat under the scuttle of the 20 HP car, proposing modifications. | 16th Aug 1923 | Box 56 \ 3 Scan141 | |
| Standardisation of a modified, shorter undershield to aid in cooling the floor-boards. | 16th Aug 1923 | Box 56 \ 3 Scan142 | |
| Standardisation document for a modification to the undershield to assist in cooling floor-boards. | 16th Aug 1923 | Box 56 \ 3 Scan143 | |
| Letter discussing a proposal to test a non-oxidising aluminium alloy for making undershields and bonnets for 20HP and 40/50 models. | 9th Sep 1923 | Box 56 \ 3 Scan144 | |
| Feasibility of shortening the undershield for the 20HP model. | 24th Sep 1923 | Box 56 \ 3 Scan145 | |
| Altering the undershield on chassis 2323 for a Mr. Steavenson. | 9th Nov 1923 | Box 56 \ 3 Scan146 | |
| Modifying the undershield of the 20 HP car to make it easier to remove. | 4th Jan 1924 | Box 56 \ 3 Scan147 | |
| Standardisation proposal for the chassis undershield to make it easier to remove. | 15th Jan 1924 | Box 56 \ 3 Scan148 | |
| Costs for the standardisation of an undershield, part X.4272. | 18th Jan 1924 | Box 56 \ 3 Scan149 | |
| Method for draining oil from the 20 HP sump, noting Mr. Royce's agreement to not remove the undershield. | 7th Jul 1924 | Box 56 \ 3 Scan150 | |
| Authorisation sheet No.9 detailing modifications for the 'India' chassis. | 22th May 1925 | Box 56 \ 3 Scan151 | |
| Authorisation sheet for modifications to the undershield, oil pump, and front axle for 'India' specification cars. | 21th May 1925 | Box 56 \ 3 Scan152 | |
| Modification for engine side guards to prevent mud splashing and requesting airflow tests. | 1st Jul 1925 | Box 56 \ 3 Scan153 | |
| 20HP undershield being positioned too low, causing potential contact with the flywheel. | 10th Jun 1926 | Box 56 \ 3 Scan154 | |
| Modifications to a 20 HP undershield and associated lever dimensions. | 14th Jun 1926 | Box 56 \ 3 Scan155 | |
| Discrepancies and modifications to a 20 HP undershield. | 18th Jun 1926 | Box 56 \ 3 Scan156 | |
| Modifications to the 20HP undershield and associated components. | 19th Jun 1926 | Box 56 \ 3 Scan157 | |
| The design of 20HP undershields to address mud splashing and improve road clearance. | 1st Jul 1926 | Box 56 \ 3 Scan158 | |
| Experimental modifications to the 20 HP engine undershields to prevent water and mud ingress. | 13th Dec 1926 | Box 56 \ 3 Scan159 | |
| Comparative test report on a modified gearbox undersheet for India, focusing on mud protection and ground clearance. | 24th Jan 1927 | Box 56 \ 3 Scan160 | |
| Standardisation of an improved undershield for chassis parts. | 5th Apr 1927 | Box 56 \ 3 Scan161 | |
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