| Description | Date | Identifier | |
| List of required lamps and a windscreen wiper for a 20/25 HP Enclosed Limousine. | 14th Jul 1930 | Box 5 \ 2 02-page344 | |
| Instruction to carry out work on chassis 17-C4 as per an attached estimate. | 19th Aug 1930 | Box 5 \ 2 02-page345 | |
| Instruction for Messrs. Sanderson & Holmes to carry out work on chassis 12-G4. | 17th Sep 1930 | Box 5 \ 2 02-page346 | |
| Instruction for Messrs. Sanderson & Holmes to carry out work on chassis 14-04 as per an attached estimate. | 17th Sep 1930 | Box 5 \ 2 02-page347 | |
| Instruction for Messrs. Sanderson & Holmes to carry out work on chassis 16-G4 as per an attached estimate. | 17th Sep 1933 | Box 5 \ 2 02-page348 | |
| Instruction to Messrs. Sanderson & Holmes to carry out work on chassis GLN-50. | 17th Sep 1930 | Box 5 \ 2 02-page349 | |
| Confidential memorandum discussing issues with car body 'booming' and the consideration of all-steel bodies. | 20th Oct 1930 | Box 5 \ 2 02-page350 | |
| Collaboration with coachbuilders over issues with car bodies, noises, and shared responsibility. | 14th Oct 1930 | Box 5 \ 2 02-page351 | |
| The causes and mitigation of chassis and coachwork vibrations and noise. | 14th Oct 1930 | Box 5 \ 2 02-page352 | |
| Vibration and 'booming' issues in the Phantom II chassis, attributing some problems to coachwork and considering improvements for an upcoming production order. | 14th Oct 1930 | Box 5 \ 2 02-page353 | |
| Inquiry to Messrs. Mulliners regarding the availability of a trials car with a body similar to one previously supplied. | 19th Nov 1930 | Box 5 \ 2 02-page354 | |
| Letter to a potential customer, Mr. Thompson, regarding a 25 HP demonstration car available for a trial run. | 21th Nov 1930 | Box 5 \ 2 02-page355 | |
| Quote and discussion about converting a Weymann type fabric-covered body to metal panelling. | 19th Dec 1930 | Box 5 \ 2 02-page356 | |
| Causes and potential solutions for engine vibrations and 'booming' in 25HP and 45HP car bodies. | 26th Dec 1930 | Box 5 \ 2 02-page357 | |
| Design scheme for the 20 HP brake gear. | 1st Aug 1919 | Box 5 \ 3 03-page001 | |
| Confirming receipt of brake drums, Bakalite pieces, and lamp holders from various suppliers. | 29th Oct 1919 | Box 5 \ 3 03-page002 | |
| Scheme for the brake gear of the Goshawk. | 10th Feb 1920 | Box 5 \ 3 03-page003 | |
| Letter discussing the design and layout of the Goshawk brake gear, mentioning delays and forwarding previous schemes for review. | 16th Feb 1930 | Box 5 \ 3 03-page004 | |
| Discussion of various design schemes for brake, clutch, axle, and differential gear arrangements. | 1st Feb 1920 | Box 5 \ 3 03-page005 | |
| Differential gear designs, comparing a driven outer case with a free aluminium casting, and proposals for brake differentials. | 23th Feb 1920 | Box 5 \ 3 03-page006 | |
| Modifications to the brake gear and pedal mechanism for the 'Goshawk' engine, with reference to the 'Buzzard' and 'Vulture' designs. | 23th Feb 1920 | Box 5 \ 3 03-page007 | |
| Mr. Royce's feedback and requested modifications for several vehicle components. | 8th May 1920 | Box 5 \ 3 03-page008 | |
| Specifications for a new small chassis design, including details on the gearbox, back axle, and suspension. | 17th Nov 1920 | Box 5 \ 3 03-page009 | |
| New drawing for the 'Goshawk' brake gear mechanism due to difficulties with the actuating shafts. | 17th Dec 1920 | Box 5 \ 3 03-page010 | |
| Revised brake actuating gear for the 'Goshawk' model, referencing accompanying blueprints. | 20th Dec 1920 | Box 5 \ 3 03-page011 | |
| The new detail schemes for the Goshawk model's brake gear and a modification to the change-speed lever trough. | 20th Dec 1920 | Box 5 \ 3 03-page012 | |
| Various design schemes for adapting the Goshawk rear axle brake gear. | 24th Dec 1920 | Box 5 \ 3 03-page013 | |
| Note on providing extra motion for a worn brake lever by reducing the length of serrated sections. | 24th Dec 1920 | Box 5 \ 3 03-page014 | |
| Comparison between 'Goshawk I' and 'Goshawk II' brake gear schemes. | 1st Dec 1920 | Box 5 \ 3 03-page015 | |
| Adaptation of Goshawk rear axle brake gear for the 'Kite' model. | 30th Dec 1920 | Box 5 \ 3 03-page016 | |
| Comparing 'Goshawk I' and 'Goshawk II' brake gear systems to determine the best option for a new large chassis model. | 1st Dec 1920 | Box 5 \ 3 03-page017 | |
| Vehicle performance issues including brakes, radiator, clutch, and springing. | 12th Jan 1921 | Box 5 \ 3 03-page018 | |
| Technical discussion on issues related to brakes, radiator, clutch, and springing systems. | 1st Jan 1921 | Box 5 \ 3 03-page019 | |
| The design of the brake actuating gear, including a request from Mr. Royce for a model. | 1st Jan 1921 | Box 5 \ 3 03-page020 | |
| Modifications to the 'Goshawk' II rear brakes and frame clearance. | 15th Jan 1921 | Box 5 \ 3 03-page021 | |
| Design rationale for bolts and split-pins, and an update on a gearbox delivery. | 15th Jan 1921 | Box 5 \ 3 03-page022 | |
| Modifications to the 'Goshawk' brake gear arrangement. | 30th Nov 1927 | Box 5 \ 3 03-page023 | |
| Requesting an alteration to a duplicated drawing number for the 'Goshawk II' Brake Actuating Gear. | 19th Jan 1921 | Box 5 \ 3 03-page024 | |
| List of instructions from Mr. Royce for the arrangement of the brake gear on the 'Goshawk 1' NT Scheme 724. | 26th Jan 1921 | Box 5 \ 3 03-page025 | |
| Feedback from Mr. Royce on pedal lever design and the return of a blueprint. | 26th Jan 1921 | Box 5 \ 3 03-page026 | |
| Design and sending of drawings for the Goshawk I brake operating gear. | 31th Jan 1922 | Box 5 \ 3 03-page027 | |
| Comparison of the strength of brake operating gear levers with those of the 40/50 model. | 25th Apr 1930 | Box 5 \ 3 03-page028 | |
| Which springs should be used and which should be left out. | 10th Feb 1921 | Box 5 \ 3 03-page029 | |
| Proposed alterations by Mr. Royce to a rear axle, tube, and brake scheme. | 10th Feb 1921 | Box 5 \ 3 03-page030 | |
| Axle tube thickness, modulus drawing, and road spring attachment. | 1st Feb 1921 | Box 5 \ 3 03-page031 | |
| Design change to the Goshawk 11 brake gear, deleting an adjustment on the rear axle mechanism. | 3rd Mar 1931 | Box 5 \ 3 03-page032 | |
| Five points of instruction from Mr. Royce regarding the Goshawk I brake gear. | 4th Mar 1921 | Box 5 \ 3 03-page033 | |
| Mr. Royce's remarks on the 'Goshawk 11' axle tube brake and rear hub. | 8th Mar 1921 | Box 5 \ 3 03-page034 | |
| Design specifications for brake, wheel, and axle components, including Michelin wheels and Goshawk I alterations. | 10th Mar 1921 | Box 5 \ 3 03-page035 | |
| Continued note on the assembly of the inner ball bearing and hub nut for the 40/50 model. | 1st Mar 1921 | Box 5 \ 3 03-page036 | |
| Modifications to the Goshawk II rear axle brake rear hub, detailing changes for disc and Dunlop wire wheels. | 24th Mar 1921 | Box 5 \ 3 03-page037 | |
| Mr. Royce's required alterations to the Goshawk II rear hub and brake drum design. | 1st Apr 1921 | Box 5 \ 3 03-page038 | |
| Blueprints for the Goshawk II back axle brake gear, detailing Michelin Disc and Dunlop Wire wheel arrangements. | 11th Apr 1921 | Box 5 \ 3 03-page039 | |
| Three potential wheel types for the Goshawk 11 model and subsequent commercial enquiries. | 12th Jul 1921 | Box 5 \ 3 03-page040 | |
| Specifying that the ordered Michelin wheels must be suitable for straight-sided tyres. | 14th Jul 1921 | Box 5 \ 3 03-page041 | |
| Choice of tyres and wheels for the Goshawk 11 chassis. | 15th Aug 1921 | Box 5 \ 3 03-page042 | |
| Material for Goshawk 11 rear brake drums, detailing issues with soft mild steel and proposing a new steel with higher carbon content. | 16th Sep 1931 | Box 5 \ 3 03-page043 | |
| Recommendation to manufacture aluminium covers for rear brakes in one non-detachable piece. | 18th Oct 1921 | Box 5 \ 3 03-page044 | |
| Alternative thrust bearing design for Goshawk 11 and an oil leak from the axle pinion shaft. | 10th Oct 1921 | Box 5 \ 3 03-page045 | |
| Ongoing issues with the Goshawk II chassis regarding brakes, water loss, oil filtration, and over-oiling. | 2nd Jan 1922 | Box 5 \ 3 03-page046 | |
| Clutch experiments comparing Ferodo bonded asbestos against Ferobestos. | 12th Jan 1922 | Box 5 \ 3 03-page047 | |
| Clarifying production instructions for the Goshawk 11 and Rear Axle, Hub & Brake components. | 17th Jan 1922 | Box 5 \ 3 03-page048 | |
| Causes and solutions for brake wear, squeaking, and compensating shaft flexibility issues. | 1st Jan 1922 | Box 5 \ 3 03-page049 | |
| Continued memo discussing alterations to brake levers, wire rope travel, and a squeak issue. | 25th Jan 1922 | Box 5 \ 3 03-page050 | |
| Troubleshooting brake squeaking, drum scoring and wearing on the Goshawk 11 model. | 25th Jan 1922 | Box 5 \ 3 03-page051 | |
| Goshawk II brakes, recommending countersinking rivets for aluminium brake straps to prevent heat transfer and failure. | 2nd Feb 1922 | Box 5 \ 3 03-page052 | |
| Brake squeaks and clutch issues on a Goshawk-II 10,000 miles test car. | 31th Mar 1922 | Box 5 \ 3 03-page053 | |
| Proposal with drawing No. LeC.1558 to prevent the brake lever button from rattling on the Goshawk. | 27th Apr 1922 | Box 5 \ 3 03-page054 | |
| The flange diameter on Goshawk 11 brake drums. | 4th Apr 1923 | Box 5 \ 3 03-page055 | |
| Two proposed designs for an improved joint on the Goshawk engine's brake tables. | 10th May 1922 | Box 5 \ 3 03-page056 | |
| Proposals to resolve squeaking brakes and suggesting modifications to brake levers and joints. | 10th May 1922 | Box 5 \ 3 03-page057 | |
| To hold drilling on Goshawk II brake shoes and straps due to considering a different type of rivet. | 15th May 1922 | Box 5 \ 3 03-page058 | |
| Reduction of rivets for Goshawk 11 rear brake shoes and considering alternative Raybestos linings. | 17th May 1922 | Box 5 \ 3 03-page059 | |
| Preferred arrangement for the Goshawk II rear brake drum damper and mud fling. | 19th May 1922 | Box 5 \ 3 03-page060 | |
| The design of Goshawk II rear brake cables, specifying a non-rotating bush for the jaw end. | 8th May 1922 | Box 5 \ 3 03-page061 | |
| Outlining Mr. Royce's requested modifications to the Goshawk 11 brake lever press button to prevent rattling and improve construction. | 20th May 1922 | Box 5 \ 3 03-page062 | |
| Faults and proposed modifications for Goshawk model aluminium brake shoes, addressing cracking and seizing. | 28th Jun 1922 | Box 5 \ 3 03-page063 | |
| Response to a report on ineffective brakes and an oil leak from the rear hubs of a Goshawk vehicle. | 1st Aug 1922 | Box 5 \ 3 03-page064 | |
| Seized hand brake compensating gear on a 6-Goshawk-II, with Mr. Royce's suggestion for a design modification. | 29th Aug 1922 | Box 5 \ 3 03-page065 | |
| Telegram received by telephone requesting four replacement wheel hubs. | 30th Sep 1922 | Box 5 \ 3 03-page066 | |
| From CJ to Hs. regarding the Goshawk, requesting information and attaching a copy of a memo sent to R. | 18th Oct 1922 | Box 5 \ 3 03-page067 | |
| Letter from C.J. to R. discussing market opinion in Paris on fitting the 20 HP car with front-wheel brakes. | 18th Oct 1922 | Box 5 \ 3 03-page068 | |
| Follow-up letter requesting designs for a generator drive brake and a bonnet fastener. | 1st Nov 1922 | Box 5 \ 3 03-page069 | |
| Design of front wheel brakes for the Goshawk 11. | 11th Nov 1922 | Box 5 \ 3 03-page070 | |
| Front spring modifications related to steering and front wheel brakes, specifically for a Goshawk model. | 23th Oct 1922 | Box 5 \ 3 03-page071 | |
| Calculation of the effect of wheel rotation on braking, comparing translational and rotational kinetic energy. | 28th Dec 1922 | Box 5 \ 3 03-page072 | |
| Part changes and replacements for the Goshawk I rear axle and hub. | 1st Jan 1923 | Box 5 \ 3 03-page073 | |
| Faults on a 20 HP Open Demonstration Car (40GS), including dynamo rattle, squeaking brakes, and a boom at 30 mph. | 2nd Feb 1923 | Box 5 \ 3 03-page074 | |
| Cause and potential modification for whistling carburetters and noisy brake levers on the 20 HP chassis. | 6th Mar 1923 | Box 5 \ 3 03-page075 | |
| Proposal for a modification scheme for brake levers and a system for their exchange on experimental cars. | 6th Mar 1923 | Box 5 \ 3 03-page076 | |
| Complaints of rattling brake levers on 20 HP cars and the assurance of a silent replacement. | 16th Jul 1923 | Box 5 \ 3 03-page077 | |
| Brake issues caused by over-oiling the back axle on a 20 HP car. | 16th Jul 1923 | Box 5 \ 3 03-page078 | |
| Complaint from a visiting Inspector regarding squeaking brakes on a 20 HP car. | 17th Jul 1923 | Box 5 \ 3 03-page079 | |
| Instruction to immediately order .6 carbon steel brake drums for the 20 HP chassis. | 27th Jul 1923 | Box 5 \ 3 03-page080 | |
| Material specification and cost change for 20 HP Brake Drum Pressings. | 10th Aug 1923 | Box 5 \ 3 03-page081 | |
| Gearbox design and production strategy for the Goshawk model, focusing on side levers and 4-wheel brakes. | 6th Oct 1923 | Box 5 \ 3 03-page082 | |
| 20 HP chassis brakes, addressing issues of squeaking, drum wear, and the proposed introduction of 4-wheel brakes. | 1st Nov 1923 | Box 5 \ 3 03-page083 | |
| Weaknesses in the 20 HP brakes, specifically squeaking and excessive drum wear. | 8th Nov 1923 | Box 5 \ 3 03-page084 | |
| Coachwork modifications for the conversion to four-wheel brakes on 40/50 and Goshawk models. | 8th Nov 1923 | Box 5 \ 3 03-page085 | |
| Instruction to halt work on front wheel brakes but to design the new gearbox to accommodate a servo later. | 10th Jan 1924 | Box 5 \ 3 03-page086 | |
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