| Description | Date | Identifier | |
| List of six modifications to be carried out on the 44-PK car. | 13th Apr 1926 | Box 69 \ 4 scan0035 | |
| Delay of car EAC. 8 due to a late front axle forging and detailing its steering modifications. | 17th Apr 1926 | Box 69 \ 4 scan0036 | |
| Listing seventeen urgent modifications required for a vehicle before a 10,000-mile trip to France. | 21th Apr 1926 | Box 69 \ 4 scan0037 | |
| Modifications and weight-saving measures for the Lighter Phantom Engine. | 5th May 1926 | Box 69 \ 4 scan0038 | |
| Cover note forwarding a report on chassis testing issues for use at West Wittering. | 1st May 1926 | Box 69 \ 4 scan0039 | |
| Chief points making it difficult to produce satisfactory cars, specifically the 'New Phantom' and '20HP Chassis'. | 1st May 1926 | Box 69 \ 4 scan0040 | |
| From BJ to Hs asking for the clearance on a 40/50 HP chassis following alterations detailed in an attached memo. | 10th May 1926 | Box 69 \ 4 scan0041 | |
| Altering the 40/50 chassis and a recommendation to await new chassis developments. | 5th Jun 1926 | Box 69 \ 4 scan0042 | |
| Modifications for the Phantom model, covering pistons, auto advance, steering, front axle, shock dampers, and magnetos. | 14th May 1926 | Box 69 \ 4 scan0043 | |
| Design decisions regarding wheels, cost justifications for certain features, and future manufacturing improvements. | 8th May 1926 | Box 69 \ 4 scan0044 | |
| Modifications to the Phantom chassis, including steering, damping, and ignition systems. | 8th May 1926 | Box 69 \ 4 scan0045 | |
| The design, testing, and potential improvements of three different piston types. | 8th May 1926 | Box 69 \ 4 scan0046 | |
| Proposed modifications to address steering wobble and vibration issues on car 7-EX. | 8th May 1926 | Box 69 \ 4 scan0047 | |
| Preparations and modifications for a 40/50 HP car and a 12-EX car under the Phantom Chassis project. | 19th May 1926 | Box 69 \ 4 scan0048 | |
| Experimental information about Phantom shocks, steering issues, and cars operating in France. | 20th May 1926 | Box 69 \ 4 scan0049 | |
| Testing status and results for steering, tyres, and shock dampers on the 20 HP and Phantom models. | 29th May 1926 | Box 69 \ 4 scan0050 | |
| New lightened axle, clutch issues, and proposed modifications for the 12-EX car. | 29th May 1926 | Box 69 \ 4 scan0051 | |
| Bodywork issues with car 7-EX, including flexing and squeaking, and arranging for temporary replacement vehicles. | 3rd Jun 1926 | Box 69 \ 4 scan0052 | |
| Chasing up the quarterly list of customers' complaints. | 1st Jun 1926 | Box 69 \ 4 scan0053 | |
| Delays and design changes for the Lightened Phantom Engine. | 9th Jun 1926 | Box 69 \ 4 scan0054 | |
| 'Phantom Criticisms' and outlining development priorities between various departments. | 10th Jun 1926 | Box 69 \ 4 scan0055 | |
| Discomfort of high back seats and proposals for a low chassis design to improve comfort. | 10th Jun 1926 | Box 69 \ 4 scan0056 | |
| Issue of uncomfortably high car seats and proposing solutions for improved seating comfort as part of the 'Low Chassis Campaign'. | 10th Jun 1926 | Box 69 \ 4 scan0057 | |
| Internal memorandum clarifying a misunderstanding regarding the specification of a new petrol tank gauge for the Phantom model. | 11th Jun 1926 | Box 69 \ 4 scan0058 | |
| From BJ to R regarding a process for managing suggested improvements from Sales officials. | 1st Jun 1926 | Box 69 \ 4 scan0059 | |
| From 'R' to 'Hs' listing complaints about a car after a 260-mile test run. | 15th Jun 1926 | Box 69 \ 4 scan0060 | |
| Inspection and suggested improvements for a Barker open car body on a Phantom chassis. | 16th Jun 1926 | Box 69 \ 4 scan0061 | |
| Concluding page of a report on campaigns to lighten the chassis and lower the car's components. | 18th Jun 1926 | Box 69 \ 4 scan0062 | |
| Unsatisfactory bodywork on car 7-EX, specifically the flexibility of the scuttle causing transverse movement of the windscreen. | 18th Jun 1926 | Box 69 \ 4 scan0063 | |
| Weak mechanical construction of the 7-EX body and its potential impact on the company's reputation. | 22th Jun 1926 | Box 69 \ 4 scan0064 | |
| Benefits of low floors and appropriate seat design in cars, considering different user types and use cases. | 22th Jun 1926 | Box 69 \ 4 scan0065 | |
| Trial report on car 12-EX, criticising the exposed nature of the back seats. | 24th Jun 1926 | Box 69 \ 4 scan0066 | |
| Performance review of the Goshawk model with proposals for improvements to its engine, suspension, and appearance. | 24th Jun 1926 | Box 69 \ 4 scan0067 | |
| Potential modifications to a car model, comparing it to the Phantom and 40/50 models. | 1st Jul 1926 | Box 69 \ 4 scan0068 | |
| Responsibility for bodywork suggestions to coachbuilders and observations on construction methods. | 1st Jul 1926 | Box 69 \ 4 scan0069 | |
| Confirmation of a wire detailing travel arrangements and work on a car. | 1st Jul 1926 | Box 69 \ 4 scan0070 | |
| Requirements for front brakes, generators, motors, and reaction dampers following a visit from England. | 1st Jul 1926 | Box 69 \ 4 scan0071 | |
| Engine rigidity, suspension, dampers, and comparative riding-quality tests. | 1st Jul 1926 | Box 69 \ 4 scan0072 | |
| Listing fifteen technical improvements for testing on an experimental car in France. | 1st Jul 1926 | Box 69 \ 4 scan0073 | |
| Telegram arranging for a chassis to be driven from coachbuilders Barkers back to Derby. | 2nd Jul 1926 | Box 69 \ 4 scan0074 | |
| The development of the American Chassis EAC-1X and the process for feedback. | 5th Jul 1926 | Box 69 \ 4 scan0075 | |
| BJ to Hs requesting to inspect and test a light semi-speed 40/50 HP model. | 1st Jul 1926 | Box 69 \ 4 scan0076 | |
| Letter to Barkers coachbuilders regarding the collection and return of Mr. Royce's car chassis 7-EX. | 7th Jul 1926 | Box 69 \ 4 scan0077 | |
| Chassis enquiry and the upcoming supply of stiffeners and subframe supports. | 15th Jul 1926 | Box 69 \ 4 scan0078 | |
| Listing twelve potential future chassis improvements and issues for consideration. | 1st Aug 1926 | Box 69 \ 4 scan0079 | |
| Cover note from BJ enclosing a copy of a memo about Phantoms sent to Mr. Royce. | 6th Aug 1926 | Box 69 \ 4 scan0080 | |
| Letter from BJ to R regarding customer feedback on the Phantom model, with comparisons to the Ghost. | 6th Aug 1926 | Box 69 \ 4 scan0081 | |
| Summary of customer complaints and comparisons between the Phantom and Silver Ghost models. | 8th Aug 1926 | Box 69 \ 4 scan0082 | |
| List of customer complaints and technical issues regarding the Phantom and Silver Ghost models. | 1st Aug 1926 | Box 69 \ 4 scan0083 | |
| From the Experimental Department responding to complaints about the Phantom model, covering suspension and silencer explosions. | 1st Aug 1926 | Box 69 \ 4 scan0084 | |
| Various vehicle component improvements and ongoing issues. | 1st Aug 1926 | Box 69 \ 4 scan0085 | |
| Issues and potential solutions for tappet noise, brake squeaks, chassis lubrication, and fuel supply problems. | 1st Aug 1926 | Box 69 \ 4 scan0086 | |
| Continued document page detailing petrol tank improvements and investigations into overheating and oil leaks. | 1st Aug 1926 | Box 69 \ 4 scan0087 | |
| Note about investigating oil leaks from the car. | 11th Aug 1926 | Box 69 \ 4 scan0088 | |
| Inquiring about the location of Mr. Royce's Car, 7-EX. | 11th Aug 1926 | Box 69 \ 4 scan0089 | |
| Overhaul of the 7-EX car, including fitting a new lightened front axle. | 12th Aug 1926 | Box 69 \ 4 scan0090 | |
| Three noticeable drawbacks of the Phantom car: throttle irregularity, rough slow running, and exhaust popping. | 23th Aug 1926 | Box 69 \ 4 scan0091 | |
| Sending a covered Phantom car to London to test a new lightened axle and hydraulic dampers, and to address engine running issues. | 25th Aug 1926 | Box 69 \ 4 scan0092 | |
| Confirming the requirement for a luggage grid on an experimental car. | 30th Aug 1926 | Box 69 \ 4 scan0093 | |
| Delayed production of the Lighter Phantom engine with aluminium cylinders. | 31th Aug 1926 | Box 69 \ 4 scan0094 | |
| Delay in the delivery of Experimental Car 8-EX. | 1st Sep 1926 | Box 69 \ 4 scan0095 | |
| Confirming the delivery schedule for car 8-EX, which is required by Monday mid-day to catch a boat. | 2nd Sep 1926 | Box 69 \ 4 scan0096 | |
| Confidential memo about the potential development of an 8-cylinder engine and a request for a cost estimate for an experimental chassis. | 9th Sep 1926 | Box 69 \ 4 scan0097 | |
| Virtues of an 8-cylinder engine compared to a 6-cylinder engine. | 2nd Sep 1926 | Box 69 \ 4 scan0098 | |
| Strategic advantages of developing new 6 and 8 cylinder engines and chassis, referencing competitors. | 13th Sep 1926 | Box 69 \ 4 scan0099 | |
| List of requested modifications for car 7-EX for use in autumn bad weather. | 13th Sep 1926 | Box 69 \ 4 scan0100 | |
| New procedure for chassis testing, depot instructions, and handling new car complaints. | 22th Sep 1926 | Box 69 \ 4 scan0101 | |
| Test results and suggested modifications for the Phantom 10-EX experimental car. | 23th Sep 1926 | Box 69 \ 4 scan0102 | |
| Need for a car at 'WW' for visitors and staff, and the status of chassis 7-EX. | 24th Sep 1926 | Box 69 \ 4 scan0103 | |
| Stiffening the scuttle on car 10-EX to fix issues with 'jellying' and creaking. | 25th Sep 1926 | Box 69 \ 4 scan0104 | |
| Tyre trouble with the Experimental Saloon 8-EX during a road trip from Chalon to Paris. | 27th Sep 1926 | Box 69 \ 4 scan0105 | |
| Comparative weights of lightened components for a Phantom engine, resulting in a total weight reduction. | 27th Sep 1926 | Box 69 \ 4 scan0106 | |
| Bodywork for a car for 'WW' and the use of a scuttle from car 7-EX on 10-EX. | 30th Sep 1926 | Box 69 \ 4 scan0107 | |
| Modifications to valve timing and the induction system for the Aluminium Phantom engine. | 10th Sep 1926 | Box 69 \ 4 scan0108 | |
| The removal of the throttle governor on a Phantom car. | 26th Oct 1926 | Box 69 \ 4 scan0109 | |
| Performance issues and potential improvements for the Phantom & Goshawk engines. | 27th Oct 1926 | Box 69 \ 4 scan0110 | |
| Final testing of the 7-EX car after completion of work by Barkers. | 8th Nov 1926 | Box 69 \ 4 scan0111 | |
| Trial fitting of modified louvres on a 20 HP bonnet for appearance evaluation and parts delivery. | 8th Nov 1926 | Box 69 \ 4 scan0112 | |
| Letter from coachbuilders Barker & Co. regarding the completion of the 'Mr. Royce - Allweather - 7.EX' car. | 9th Nov 1926 | Box 69 \ 4 scan0113 | |
| Private and confidential cover memo regarding the New Phantom and the Daimler Double-Six. | 11th Nov 1926 | Box 69 \ 4 scan0114 | |
| Comparing customer preference for the Phantom over the new Daimler Double-Six. | 1st Nov 1926 | Box 69 \ 4 scan0115 | |
| Internal memorandum listing eleven parts urgently required for testing. | 12th Nov 1926 | Box 69 \ 4 scan0116 | |
| From 'R' to 'Hs' discussing improvements and addressing complaints regarding the Phantom model. | 13th Nov 1926 | Box 69 \ 4 scan0117 | |
| Progress on Phantom improvements, noting challenges with obtaining instructions despite assistance from the Works. | 15th Nov 1926 | Box 69 \ 4 scan0118 | |
| Steering issues in early Phantom cars and proposed solutions. | 16th Nov 1926 | Box 69 \ 4 scan0119 | |
| Customer complaints and modifications regarding exhaust, throttle, low-speed running, and springing issues. | 16th Nov 1926 | Box 69 \ 4 scan0120 | |
| Improvements to the Phantom's riding and steering qualities by reducing front-end weight. | 16th Nov 1926 | Box 69 \ 4 scan0121 | |
| Complaints regarding the Phantom and 20 HP models, specifically about springing, brake servo, and throttle sticking. | 18th Nov 1926 | Box 69 \ 4 scan0122 | |
| Necessary improvements for carburetter, steering, and heat insulation. | 18th Nov 1926 | Box 69 \ 4 scan0123 | |
| Complaints and potential solutions for the Phantom & 20 HP models, focusing on springing, brake servo, and throttle sticking. | 18th Nov 1926 | Box 69 \ 4 scan0124 | |
| Necessary modifications to the carburetter, steering, and body to address chronic chassis faults. | 30th Nov 1926 | Box 69 \ 4 scan0125 | |
| Proposed improvements for the Phantom model regarding steering, springing, governor, and auto advance. | 30th Nov 1926 | Box 69 \ 4 scan0126 | |
| Providing feedback and impressions on two experimental cars, 8-EX and 7-EX. | 22th Nov 1926 | Box 69 \ 4 scan0127 | |
| From EV to Hs. listing five points of work required on car 7-EX ALLWEATHER before it goes to France. | 25th Nov 1926 | Box 69 \ 4 scan0128 | |
| Letter detailing faults with car 7-EX, including a leaking windscreen, instrument board squeaks, and inadequate door stop straps. | 23th Nov 1926 | Box 69 \ 4 scan0129 | |
| Communication detailing faults with a car body, including door fasteners and locks, with accompanying sketches. | 26th Nov 1926 | Box 69 \ 4 scan0130 | |
| List of 14 modifications and scheduling for the 7-EX car for Mr. Royce. | 26th Nov 1926 | Box 69 \ 4 scan0131 | |
| Disposal of experimental car 44-PK, noting its modification from a Silver Ghost to a 'V' series Phantom. | 30th Nov 1926 | Box 69 \ 4 scan0132 | |
| Listing experimental parts fitted to car 44-PK and instructions for their disposal. | 1st Dec 1926 | Box 69 \ 4 scan0133 | |
| Car 44-PK, recommending it is not suitable for H.R.H. Prince of Wales due to overhaul requirements and modifications. | 12th Dec 1926 | Box 69 \ 4 scan0134 | |
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