| Description | Date | Identifier | |
| Performance evaluation of a car, comparing it to a standard Phantom and a Chrysler, with a focus on Bentley speedometer inaccuracies. | 28th Jun 1928 | Box 70 \ 1 scan0045 | |
| Letter to the Royal Automobile Club confirming a suitable road has been found between Earith Bridge Station and Sutton. | 28th Jun 1928 | Box 70 \ 1 scan0046 | |
| Instruction to alter the cross steering tube load on car 10-EX after removing the spring-loaded friction from the pivots. | 25th Jun 1928 | Box 70 \ 1 scan0047 | |
| Proposing modifications to the Continental Phantom EAC.14 to increase body space before going into production. | 21th Feb 1928 | Box 70 \ 1 scan0048 | |
| Car's poor maximum speed, testing results, and potential causes like column whip. | 1st Feb 1928 | Box 70 \ 1 scan0049 | |
| Delay in sending Chassis No. 10-EX to London for inspection. | 31th Dec 1927 | Box 70 \ 1 scan0050 | |
| Requesting modifications to the steering nuts of the Sports Phantom cars to resolve an issue at full lock. | 6th Jan 1928 | Box 70 \ 1 scan0051 | |
| Confirmation of car 10-EX delivery to Bruton Street for experimental work, noting its steering and dash configuration. | 1st Feb 1928 | Box 70 \ 1 scan0052 | |
| The delayed arrival of car 10.EX, which was subsequently photographed and returned to Derby. | 3rd Feb 1928 | Box 70 \ 1 scan0053 | |
| Limited availability of the chassis 10-EX sports car prototype for testing. | 23th Dec 1927 | Box 70 \ 1 scan0054 | |
| Secret memo arranging the trial of chassis 10-EX in London for Sales Officials. | 22th Dec 1927 | Box 70 \ 1 scan0055 | |
| The fitting of various parts to the 10-EX car, including a sketch. | 1st Dec 1927 | Box 70 \ 1 scan0056 | |
| Specifications for the construction of the Sports Phantom Trials Car, EAC.14. | 19th Dec 1927 | Box 70 \ 1 scan0057 | |
| List of vehicle modifications and specifications for a production Phantom model. | 19th Dec 1927 | Box 70 \ 1 scan0058 | |
| General specification memo for a new sports chassis, comparing parts to the standard Phantom model. | 17th Dec 1927 | Box 70 \ 1 scan0059 | |
| List of standard modifications and a list of special parts for sports cars. | 10th Dec 1927 | Box 70 \ 1 scan0060 | |
| Upcoming arrival with a blue sports car and a request for instructions regarding Mr. Ellor. | 10th Dec 1927 | Box 70 \ 1 scan0061 | |
| Confirmation of specifications for the 10-EX experimental car, with details of planned modifications before testing. | 8th Dec 1927 | Box 70 \ 1 scan0062 | |
| Postponing a trip to Derby due to illness and inquiring about the availability of a blue Sports Model car in London. | 7th Nov 1927 | Box 70 \ 1 scan0063 | |
| The unavailability of the 10-EX car for a trial due to ongoing experimental work. | 9th Nov 1927 | Box 70 \ 1 scan0064 | |
| Requesting modifications and tests on the 10-EX car, focusing on steering, suspension, and engine components. | 11th Nov 1927 | Box 70 \ 1 scan0065 | |
| Sending a scheme for the rear light and number plate of a sports car. | 5th Nov 1927 | Box 70 \ 1 scan0066 | |
| Aesthetics of the 10-EX sports car, referencing photographs taken at Brooklands. | 4th Nov 1927 | Box 70 \ 1 scan0067 | |
| Suspension adjustments and clearances for the 10-EX sports car. | 11th Nov 1927 | Box 70 \ 1 scan0068 | |
| Inability to provide a definite completion program for the sports car chassis. | 3rd Nov 1927 | Box 70 \ 1 scan0069 | |
| Chassis modifications for the first two sports cars, regarding the brakes, rear springs, and instruments. | 31th Oct 1927 | Box 70 \ 1 scan0070 | |
| Fitting double pipes and a slipper flywheel on EAG.14 cars. | 26th Oct 1927 | Box 70 \ 1 scan0071 | |
| Typed memo requesting the use of the 10-EX car for a trip to Cornwall. | 27th Oct 1927 | Box 70 \ 1 scan0072 | |
| Special features and layout drawings for the Sports Phantom chassis EAC.14. | 27th Oct 1927 | Box 70 \ 1 scan0073 | |
| Drawing showing the wheel arch clearance for the Phantom sports chassis. | 25th Oct 1927 | Box 70 \ 1 scan0074 | |
| Design of a single downtake pipe, exhaust system, and a reduced diameter slipper flywheel. | 24th Oct 1927 | Box 70 \ 1 scan0075 | |
| Order for a sports body for a Sports Phantom EAC.14, detailing special chassis features required for the blueprint. | 19th Oct 1927 | Box 70 \ 1 scan0076 | |
| Continued internal memo listing components and instructing on the marketing of a standard chassis, avoiding the term 'sports chassis'. | 19th Oct 1927 | Box 70 \ 1 scan0077 | |
| Proposed programme of 16 modifications and updates for the EAC.14 project. | 19th Oct 1927 | Box 70 \ 1 scan0078 | |
| List of required modifications and specifications for various vehicle components. | 19th Oct 1927 | Box 70 \ 1 scan0079 | |
| Outlining the programme for producing a Sports car for the Riviera season. | 19th Oct 1927 | Box 70 \ 1 scan0080 | |
| Telegram enquiring about the bonnet length and radiator type for specific chassis numbers. | 29th Oct 1927 | Box 70 \ 1 scan0081 | |
| Altered method of rear springing for four specific cars. | 1st Oct 1927 | Box 70 \ 1 scan0082 | |
| Suspension tests and improvements for the 10-EX model, focusing on rear spring comfort. | 17th Oct 1927 | Box 70 \ 1 scan0083 | |
| Typed memo arranging to borrow car 10-EX for a test drive from the 4th to the 7th of November. | 15th Oct 1927 | Box 70 \ 1 scan0084 | |
| Outlining proposed modifications to the Sports Phantom engine's crankchamber. | 9th Sep 1927 | Box 70 \ 1 scan0085 | |
| Proposing modifications to the Sports Phantom engine due to crankchamber weaknesses. | 19th Sep 1927 | Box 70 \ 1 scan0086 | |
| Sourcing of a sample sports car body from Jarvis in Wimbledon, comparing it to production in Derby. | 19th Sep 1927 | Box 70 \ 1 scan0087 | |
| Issues with flexible front brake drums on a sports car and requesting a scheme for a more rigid design. | 17th Sep 1927 | Box 70 \ 1 scan0088 | |
| Proposal for a new cam form using rollerless tappets for the Sports Phantom. | 17th Sep 1927 | Box 70 \ 1 scan0089 | |
| Modifications for the Sports Phantom car, focusing on body and frame improvements. | 15th Sep 1927 | Box 70 \ 1 scan0090 | |
| Proposed modifications to the front axle, back axle, and engine for weight reduction and performance improvements. | 15th Sep 1927 | Box 70 \ 1 scan0091 | |
| Proposed modifications to the cylinder block, pistons, crankshaft, clutch, and valves. | 15th Sep 1927 | Box 70 \ 1 scan0092 | |
| Engine valve springs, camshaft timing, and radiator design considerations. | 15th Sep 1927 | Box 70 \ 1 scan0093 | |
| Modifications to seating positions and the crankcase. | 15th Sep 1927 | Box 70 \ 1 scan0094 | |
| Modifications to the front suspension for a Sports Phantom. | 15th Sep 1927 | Box 70 \ 1 scan0095 | |
| Bar chart showing the results of speed tests at Brooklands, detailing MPH gains and losses from altering a standard vehicle configuration. | 8th Sep 1927 | Box 70 \ 1 scan0096 | |
| Test report from Brooklands on the performance of a 17-tooth axle and a Claudel carburetter. | 13th Sep 1927 | Box 70 \ 1 scan0097 | |
| Results of tests on balloon tyres, crankcase bolts, and valve gear performance at high revolutions. | 13th Sep 1927 | Box 70 \ 1 scan0098 | |
| Analysis of the effects of various vehicle modifications on speed and performance. | 8th Sep 1927 | Box 70 \ 1 scan0099 | |
| Speed tests at Brooklands, detailing the impact of various car modifications on lap speeds. | 8th Sep 1927 | Box 70 \ 1 scan0100 | |
| Sports body design, weight savings, and proposed improvements for model 10-EX. | 13th Sep 1927 | Box 70 \ 1 scan0101 | |
| Improvements to the Phantom and Sports Car clutch, including simplifying the design, adding a quicker clutch brake, and reducing weight. | 13th Sep 1927 | Box 70 \ 1 scan0102 | |
| Arranging to meet with two cars at Gerrards Cross on a specific date and time. | 13th Sep 1927 | Box 70 \ 1 scan0103 | |
| Summary of temperature tests conducted at Brooklands to determine the effect of various car alterations. | 2nd Sep 1927 | Box 70 \ 1 scan0104 | |
| Report comparing the cooling systems of the 10-EX and standard car models, with conclusions on bonnet ventilation. | 2nd Sep 1927 | Box 70 \ 1 scan0105 | |
| Brooklands temperature test results for a car under various conditions with the exhaust cutout open and closed. | 12th Sep 1927 | Box 70 \ 1 scan0106 | |
| Required modifications and inspections for the 10-EX car. | 12th Sep 1927 | Box 70 \ 1 scan0107 | |
| Outlining required improvements and specifications for the Sports Phantom engine and car. | 10th Sep 1927 | Box 70 \ 1 scan0108 | |
| Required improvements for the Sports Phantom Engine and associated vehicle specifications. | 10th Sep 1927 | Box 70 \ 1 scan0109 | |
| Urgent launch and testing of a new Sports Model. | 9th Sep 1927 | Box 70 \ 1 scan0110 | |
| Analysis of a Brooklands test on the Sports Phantom, discussing methods to increase maximum speed through gearing changes and weight reduction. | 8th Sep 1927 | Box 70 \ 1 scan0111 | |
| Calculation for the required weight reduction to maintain acceleration performance when changing an axle pinion. | 8th Sep 1927 | Box 70 \ 1 scan0112 | |
| Performance graph showing Brake Horsepower against Engine RPM for an aluminum engine with a turbulent head and long duration camshaft. | 7th Sep 1927 | Box 70 \ 1 scan0113 | |
| Chart showing the effect of various aerodynamic and equipment configurations on the lap speed of the 10 E.X. model. | 7th Sep 1927 | Box 70 \ 1 scan0114 | |
| The Brooklands performance tests of the 10-EX car, comparing it to a standard 40/50 touring car. | 6th Sep 1927 | Box 70 \ 1 scan0115 | |
| Vehicle performance testing, discussing engine speed, valve bounce, aerodynamic effects, and proposed modifications. | 6th Sep 1927 | Box 70 \ 1 scan0116 | |
| General remarks on the 10-EX car's performance, covering suspension, steering, and the Autovac system. | 6th Sep 1927 | Box 70 \ 1 scan0117 | |
| Table of speed test results in m.p.h. for various car alterations and configurations. | 6th Sep 1927 | Box 70 \ 1 scan0118 | |
| Performance comparison between a Sports (10-EX) and Standard Touring Phantom (46-PK) chassis, focusing on speed and acceleration. | 6th Sep 1927 | Box 70 \ 1 scan0119 | |
| Completion of tests on a 10-EX sports car and the standardisation of improvements on Phantom models. | 6th Sep 1927 | Box 70 \ 1 scan0120 | |
| The sending of drawings for the Phantom Sports Engine. | 31th Aug 1927 | Box 70 \ 1 scan0121 | |
| Requesting modifications to the 10-EX chassis, including a new axle, carburetter, and valve springs. | 2nd Sep 1927 | Box 70 \ 1 scan0122 | |
| Confidential note from 'C' to 'Hs' requesting design input for a new sports model, focusing on aerodynamics and bodywork. | 27th Aug 1927 | Box 70 \ 1 scan0123 | |
| Confidential memo regarding car testing on petrol and maintaining secrecy. | 26th Aug 1927 | Box 70 \ 1 scan0124 | |
| Testing the 10-EX car at Brooklands, with plans to keep its modified engine a secret. | 1st Aug 1927 | Box 70 \ 1 scan0125 | |
| Stating disagreement with the removal of tiebars from car 10-EX, insisting on their replacement for structural integrity. | 20th Aug 1927 | Box 70 \ 1 scan0126 | |
| Technical review and feedback document on the performance and design of the 10-EX Blue Sports Car. | 18th Aug 1927 | Box 70 \ 1 scan0127 | |
| Requesting updated blueprints for a modified cylinder head and piston for the Blue Sports Chassis. | 16th Aug 1927 | Box 70 \ 1 scan0128 | |
| Telephone message concerning the testing and modification of the 10-EX blue sports car. | 16th Aug 1927 | Box 70 \ 1 scan0129 | |
| Performance issues and public perception of the experimental car 10-EX. | 15th Aug 1927 | Box 70 \ 1 scan0130 | |
| Public perception of a car, production plans for a new chassis, and a test drive report from Frinton. | 15th Aug 1927 | Box 70 \ 1 scan0131 | |
| Confirmation of a wire (telegram) regarding availability for the 'blue car'. | 10th Aug 1927 | Box 70 \ 1 scan0132 | |
| From 'Rn' to 'Hs' detailing progress on various engine developments, including high and low compression engines and Air Ministry requests. | 1st Aug 1927 | Box 70 \ 1 scan0133 | |
| Issues and modifications to the 10-EX car, including engine noise, vibration, and an axle change. | 9th Aug 1927 | Box 70 \ 1 scan0134 | |
| The differences of the 10-EX car from the standard model. | 8th Aug 1927 | Box 70 \ 1 scan0135 | |
| Issues with the 10-EX car and the failure of the Karachi engine. | 1st Aug 1927 | Box 70 \ 1 scan0136 | |
| Continuation of a report discussing engine temperature issues, flight schedules, and vehicle modifications. | 8th Aug 1927 | Box 70 \ 1 scan0137 | |
| Telegram from Royce to Robotham regarding travel arrangements. | 8th Aug 1927 | Box 70 \ 1 scan0138 | |
| Delay on car 10-EX and a query about sending it to Frinton. | 1st Aug 1927 | Box 70 \ 1 scan0139 | |
| Delay with the 10-EX car due to dissatisfaction. | 9th Aug 1927 | Box 70 \ 1 scan0140 | |
| Preparation of the speed model 10-EX for a test drive by 'BJ'. | 22th Jul 1927 | Box 70 \ 1 scan0141 | |
| Agreeing that the 10-EX car is not ready for a trial by B.J. at Frinton. | 8th Aug 1927 | Box 70 \ 1 scan0142 | |
| Secret axle control on the 12-EX model, a new sports car, and potential steering improvements. | 22th Jul 1927 | Box 70 \ 1 scan0143 | |
| Letter to Messrs. Barkers requesting a further supply of paint for the bonnet of experimental car 10-EX. | 18th Jul 1927 | Box 70 \ 1 scan0144 | |
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