| Description | Date | Identifier | |
| Experiments with a tie rod support for side spare wheel carriers on the 25 HP and 40/50 models. | 20th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan051 | |
| The testing and subsequent failure of side spare wheel carriers for the Phantom II model. | 20th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan052 | |
| The testing and modification of spare wheel support brackets and related bonnet fitting issues. | 8th Sep 1931 | West Wittering \ W \ September1931-November1931 Scan053 | |
| Standardisation of spark plug sizes, advocating for the 14mm thread. | 23th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan054 | |
| Using Fort tyres on a 25 HP car and the effects of trying smaller 18' wheels on the gearing. | 23th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan055 | |
| Tests conducted on the reverse gear of a 25 HP synchromesh gearbox. | 24th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan056 | |
| Issues with woven brake lining and soliciting suggestions for design improvements. | 28th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan057 | |
| Modifications and performance tests of the R.R. petrol pump. | 29th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan058 | |
| Graphs showing petrol pump delivery performance under various air bottle and reservoir configurations. | 19th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan059 | |
| Blank, hole-punched document with a 'received' date stamp in the bottom-left corner. | 29th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan060 | |
| British origin of the Boyce electric clock and plans to test samples from other manufacturers. | 30th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan061 | |
| The examination of ignition coils and testing a new starter motor design. | 30th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan062 | |
| Interpretation of performance curves for masked inlet valves with varying timings. | 31th Oct 1931 | West Wittering \ W \ September1931-November1931 Scan063 | |
| Blueprint detailing the specifications of a Hispano front brake drum. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan064 | |
| Stamped blank page from the Print Room, Derby. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan065 | |
| Tests conducted to understand power losses in the Phantom II exhaust system. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan066 | |
| Graph analysing power losses in a Phantom II short type silencer exhaust system under various configurations. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan067 | |
| Blank page with a Print Room reception stamp from Derby. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan068 | |
| Graph analysing losses to the exhaust system for a Phantom II short type silencer. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan069 | |
| Stamped document from the print room with illegible content. | 2nd Nov 1931 | West Wittering \ W \ September1931-November1931 Scan070 | |
| Proposal to redesign the distribution board and cut-out for the 20/25 and 40/50 chassis, including a new fuse layout. | 4th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan071 | |
| Recommendation to relocate the electrical cut-out and consolidate the circuit distribution onto a single board for the 20/25 chassis. | 4th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan072 | |
| Necessary diameter for propeller shafts to prevent whirling at high speeds. | 4th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan073 | |
| Issues with bonnet movement on Phantom II models and proposing improved bonnet lock designs. | 5th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan074 | |
| Ferranti electric clocks found they had no suitable products to offer. | 7th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan075 | |
| Tests comparing standard and low inertia spring drive balance weights for a 25 HP engine. | 7th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan076 | |
| Replacement of ammeters with control warning lamps on chassis electrical systems. | 1st Nov 1931 | West Wittering \ W \ September1931-November1931 Scan077 | |
| Modifications, testing, and implementation of electrical petrol pumps. | 12th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan078 | |
| How alterations to a petrol pump's suction passages and valve ports affected its efficiency. | 14th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan079 | |
| Experiments and modifications to a standard F.II. petrol pump to increase its output. | 13th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan080 | |
| Summary of pump modification tests 7 through 11, detailing changes to suction passages and ports and their effect on delivery rates. | 13th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan081 | |
| Summary of final test results comparing modifications to a standard banjo attachment, noting an increased delivery rate. | 13th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan082 | |
| Comparative testing of forged steel versus cast iron brake drums, including issues with squeaking and cracking. | 14th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan083 | |
| Weights and specifications for various 40/50 model brake drums and related components. | 7th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan084 | |
| Design, materials, and instrumentation for the 20/25 HP instrument board. | 7th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan085 | |
| Procedure for removing the wheelcase with a Diamond Mounting P.2. | 7th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan086 | |
| The Junkers two-stroke C.I. motor-coach engine, including details from an interview and technical specifications. | 18th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan087 | |
| Continued report on engine design and performance, comparing it to a Junkers aero engine. | 18th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan088 | |
| The performance figures, specifications, and design details of a Junkers aero engine. | 18th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan089 | |
| Compression ignition engines observed at the Commercial Motor Transport Exhibition. | 18th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan090 | |
| Technical review and comparison of Junkers, Fowler, and Blackstone engines. | 18th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan091 | |
| Engine injector equipment from various manufacturers and a meeting with C.A.V.-Bosch. | 18th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan092 | |
| Correcting a previously stated incorrect weight of ribbed drums on a chassis. | 1st Nov 1931 | West Wittering \ W \ September1931-November1931 Scan093 | |
| Test summary and comparison of a Lucas battery ignition distributor and coil against a standard company unit. | 23th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan094 | |
| The inferior performance of a Lucas ignition coil compared to an in-house design and other competitors. | 23th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan095 | |
| Preliminary report on the Bosch regulated dynamo, comparing its performance to the existing third brush controlled type. | 21th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan096 | |
| Performance analysis and comparison of a faulty Bosch regulated dynamo against a standard model. | 21th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan097 | |
| Graph comparing the output curves of 40/50 Standard and Bosch dynamos. | 19th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan098 | |
| Heavily faded document, likely a carbon copy, with a purple ink stamp at the bottom. | 21th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan099 | |
| Transmitting curves of axle movements taken on a Phantom 1 vehicle. | 25th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan100 | |
| Sending detail drawings for ribbed brake drums for the Phantom II. | 25th Nov 1931 | West Wittering \ W \ September1931-November1931 Scan101 | |
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