| Description | Date | Identifier | |
| Letter from Sanderson & Holmes Ltd. discussing charges for coachbuilding work undertaken for the Experimental Department. | 25th Apr 1938 | Box 109 \ 5 scan0041 | |
| Letter from Sanderson & Holmes Ltd. discussing competitive pricing and proposing a new charging structure for future orders. | 25th Apr 1938 | Box 109 \ 5 scan0042 | |
| List of body mounting and alteration tasks performed on chassis WXA.1. | 31th Mar 1938 | Box 109 \ 5 scan0043 | |
| List of bodywork and interior fitting tasks performed on a vehicle, page 2. | 31th Mar 1938 | Box 109 \ 5 scan0044 | |
| List of painting and assembly work tasks for a vehicle, including the final cost. | 26th Apr 1938 | Box 109 \ 5 scan0045 | |
| Spark plug testing and misfiring issues on chassis WXA-1. | 26th Apr 1938 | Box 109 \ 5 scan0046 | |
| Letter to Sanderson & Holmes, Ltd. thanking them for their efforts, a credit of £6/4/8, and expressing hope for future work on experimental bodies. | 26th Apr 1938 | Box 109 \ 5 scan0047 | |
| Short typed memo regarding WXA-1 spark plugs and arranging a car trial. | 27th Apr 1938 | Box 109 \ 5 scan0048 | |
| Arranging a visit to London to investigate and reproduce engine misfires on a customer's car. | 28th Apr 1938 | Box 109 \ 5 scan0049 | |
| Note arranging for an experimental department representative to try a car. | 28th Apr 1938 | Box 109 \ 5 scan0050 | |
| Sending a mechanic to London to examine misfires on a car. | 29th Apr 1938 | Box 109 \ 5 scan0051 | |
| Arranging for a person to be met at the train station with a car. | 2nd May 1938 | Box 109 \ 5 scan0052 | |
| Follow-up memo clarifying a chassis number from a previous communication. | 4th May 1938 | Box 109 \ 5 scan0053 | |
| Diagnosing and resolving engine misfires on a specific car, likely belonging to 'Sg'. | 6th May 1938 | Box 109 \ 5 scan0054 | |
| The removal of a faulty spark plug and coil for examination. | 6th May 1938 | Box 109 \ 5 scan0055 | |
| Car performance issues including starting, spark plugs, and fuel consumption. | 21th Apr 1938 | Box 109 \ 5 scan0056 | |
| The arrival of a car for modifications to bring it to production standard. | 24th May 1938 | Box 109 \ 5 scan0057 | |
| Planned modifications for vehicle WXA-1, including an over-oiling cylinder and steering pivots. | 26th May 1938 | Box 109 \ 5 scan0058 | |
| List of modifications and parts to be prepared for a Wraith WXA.1 car. | 26th May 1938 | Box 109 \ 5 scan0059 | |
| Work instructions for a Wraith WXA.1 vehicle. | 14th Jun 1938 | Box 109 \ 5 scan0060 | |
| Urgent memo requesting the fitting of an anti-splash vent pipe and a washer to Sg's car. | 15th Jun 1938 | Box 109 \ 5 scan0061 | |
| Requesting a demonstration that a petrol leak from a car's filler cap on corners has been resolved. | 20th Jun 1938 | Box 109 \ 5 scan0062 | |
| Request to arrange collection of a car from Derby and for a list of completed work items. | 21th Jun 1938 | Box 109 \ 5 scan0063 | |
| Cover note for an attached list of work carried out on a car whilst at Derby. | 21th Jun 1938 | Box 109 \ 5 scan0064 | |
| Summary of details and modifications fitted to car WXA.1 following a test. | 21th Jun 1938 | Box 109 \ 5 scan0065 | |
| Covering memo regarding 'Sg's Car - WXA-1', attaching another memo with updated information on points previously raised. | 27th Jun 1938 | Box 109 \ 5 scan0066 | |
| Criticisms and detailing modifications made to car WXA.1. | 27th Jun 1938 | Box 109 \ 5 scan0067 | |
| Report about an engine flooding and having trouble starting when the car is parked pointing uphill. | 8th Jul 1938 | Box 109 \ 5 scan0068 | |
| Down-draught Stromberg carburetter flooding issue when a car is on a gradient. | 8th Jul 1938 | Box 109 \ 5 scan0069 | |
| Comparison of carburetter flooding on a gradient between the Wraith and 25/30 models. | 16th Jul 1938 | Box 109 \ 5 scan0070 | |
| Issue of carburetter flooding on the Wraith model when on a gradient. | 16th Jul 1938 | Box 109 \ 5 scan0071 | |
| Premature wear and life expectancy of tyres on various car models. | 28th Jul 1938 | Box 109 \ 5 scan0072 | |
| Tyre life and performance on various car models, referencing specific mileage figures and Dunlop load capacity tables. | 5th Aug 1938 | Box 109 \ 5 scan0073 | |
| Report discussing tyre wear, mileage, and potential modifications to tyre size, axle, and gear ratios for the Wraith model. | 5th Aug 1938 | Box 109 \ 5 scan0074 | |
| Analysis of a failed exhaust pipe, detailing the cause of failure, wall thickness measurements, and hardness tests. | 17th Aug 1938 | Box 109 \ 5 scan0075 | |
| Laboratory report showing a micrograph of oxide penetration on a mild steel exhaust pipe. | 17th Aug 1938 | Box 109 \ 5 scan0076 | |
| Instruction memo to modify the radiators on two Wraith cars to bring them in line with B series production. | 18th Aug 1938 | Box 109 \ 5 scan0077 | |
| Typed memo confirming a car service appointment following a telephone call. | 21th Sep 1938 | Box 109 \ 5 scan0078 | |
| Arranging for a car and driver to be sent for a two-day loan. | 22th Sep 1938 | Box 109 \ 5 scan0079 | |
| List of repairs and upgrades for a customer's car. | 23th Sep 1938 | Box 109 \ 5 scan0080 | |
| List of modifications carried out on a Wraith and a report on a timing gear rattle. | 30th Sep 1938 | Box 109 \ 5 scan0081 | |
| Modifications, a new Bakelite filler cap, and a timing gear rattle issue. | 30th Sep 1938 | Box 109 \ 5 scan0082 | |
| Modifications to a camshaft, bearing housing, and wheel case. | 5th Oct 1938 | Box 109 \ 5 scan0083 | |
| Summary of modifications required for job WXA-1, concerning the camwheel, camshaft and gears. | 5th Oct 1938 | Box 109 \ 5 scan0084 | |
| The availability of parts and the timeline for fitting a new cam wheel. | 5th Oct 1938 | Box 109 \ 5 scan0085 | |
| Modifications for a Wraith (WXA.1) to fix timing gear rattles. | 5th Oct 1938 | Box 109 \ 5 scan0086 | |
| The delay of car WXA-1's return to Derby due to its use in trials for the Paris Show. | 5th Oct 1938 | Box 109 \ 5 scan0087 | |
| The arrangement for a car to be brought to Derby. | 19th Oct 1938 | Box 109 \ 5 scan0088 | |
| From Sg to Rm regarding the postponement of sending a car to Derby for a week. | 24th Oct 1938 | Box 109 \ 5 scan0089 | |
| The postponed visit of car WXA-1 to Derby. | 28th Oct 1938 | Box 109 \ 5 scan0090 | |
| Requesting the preparation of various parts for a WXA.4 Sg's Wraith, including a new exhaust system. | 1st Nov 1938 | Box 109 \ 5 scan0091 | |
| Typed letter concerning the investigation and rectification of a 'thump' in a customer's car at 20 m.p.h. | 4th Nov 1938 | Box 109 \ 5 scan0092 | |
| Car's unavailability for a trial run due to a timing gear modification and engine removal. | 5th Nov 1938 | Box 109 \ 5 scan0093 | |
| Delayed return of a car to London pending the arrival of new timing gears. | 7th Nov 1938 | Box 109 \ 5 scan0094 | |
| 'Sg' to 'BY' concerning the return of trial car WXA-1 due to a recurring mechanical issue with its non-standard engine mounting. | 8th Nov 1938 | Box 109 \ 5 scan0095 | |
| Delay in car repairs due to the need to refit noisy timing gears. | 10th Nov 1938 | Box 109 \ 5 scan0096 | |
| Requesting the fitting of a standardized water pump from an 8.B.V. car to Sg's car. | 10th Nov 1938 | Box 109 \ 5 scan0097 | |
| Letter detailing repair delays, issues with engine mounting, timing gears, and an exhaust system thump on a car. | 11th Nov 1938 | Box 109 \ 5 scan0098 | |
| Delay in providing a Wraith for trials due to a shortage. | 15th Nov 1938 | Box 109 \ 5 scan0099 | |
| To Mr. Dodd concerning a missing set of luggage straps for Chassis No. WXA 1. | 18th Nov 1938 | Box 109 \ 5 scan0100 | |
| Dispatch and return of a pair of luggage straps for Chassis WXA.1. | 21th Nov 1938 | Box 109 \ 5 scan0101 | |
| Confirming a list of work carried out on a car is being provided. | 21th Nov 1938 | Box 109 \ 5 scan0102 | |
| List of modifications carried out on car WXA.1, a Sg's Wraith. | 21th Nov 1939 | Box 109 \ 5 scan0103 | |
| Options for a combined car heater and defroster for a new Wraith chassis, recommending the Smith's 'HaDees' unit. | 29th Dec 1938 | Box 109 \ 5 scan0104 | |
| Design and implementation of a windscreen defroster system. | 29th Dec 1938 | Box 109 \ 5 scan0105 | |
| Installation of a 'Hadees' heater and 'Philco' radio set in a New Wraith III. | 12th Jan 1939 | Box 109 \ 5 scan0106 | |
| Letter to Park Ward & Co. Ltd. regarding the body construction and heater/defroster installation for Mr. Sidgreaves' new Wraith III. | 12th Jan 1939 | Box 109 \ 5 scan0107 | |
| The second page of a letter from the Chief Engineer of Chassis requesting an urgent elevation of the screen rail with Lucas wiper components. | 13th Jan 1939 | Box 109 \ 5 scan0108 | |
| Fitting of a de-froster, heater, and radio to car WMB-11. | 13th Jan 1939 | Box 109 \ 5 scan0109 | |
| The arrangement of a 'Hadees' heater for Sg's Car (WMB.11) and noting remarks about the rear heater and radio. | 16th Jan 1939 | Box 109 \ 5 scan0110 | |
| Improving the performance of a Wraith and incorporating experiments to reduce cylinder bore wear. | 15th Feb 1939 | Box 109 \ 5 scan0111 | |
| Wraith's improved performance, arranging an engine change and transport of the car to Derby. | 15th Feb 1939 | Box 109 \ 5 scan0112 | |
| Supply and experimental fitting of heater and defroster parts for a Wraith car, model WXA-1. | 16th Feb 1939 | Box 109 \ 5 scan0113 | |
| Correction notice for Instruction Sheet Y.8554, clarifying the required Heater and Defroster parts for a new car. | 17th Feb 1939 | Box 109 \ 5 scan0114 | |
| Request for parts and instructions to upgrade an engine for improved performance. | 20th Feb 1939 | Box 109 \ 5 scan0115 | |
| Parts required for fitting to a Wraith III chassis, including a specific camshaft, pistons, and new cylinder block. | 23th Feb 1939 | Box 109 \ 5 scan0116 | |
| Letter to Messrs. Park Ward & Co. Ltd. regarding blueprints for a car heater and defroster for a specific chassis. | 25th Feb 1939 | Box 109 \ 5 scan0117 | |
| Performance figures for 'g's. Wraith car, including acceleration times and maximum speed. | 28th Feb 1939 | Box 109 \ 5 scan0118 | |
| The delayed handover of a car due to ongoing testing after modifications. | 9th Mar 1939 | Box 109 \ 5 scan0119 | |
| Engine and gearbox modifications and subsequent performance testing for a vehicle. | 10th Mar 1939 | Box 109 \ 5 scan0120 | |
| Engine roughness and performance compared to the standard Wraith model. | 10th Mar 1939 | Box 109 \ 5 scan0121 | |
| Cylinder report detailing size measurements for six engine bores at three different points. | 1st Mar 1939 | Box 109 \ 5 scan0122 | |
| Comparative power test between two cars, noting weight and performance times. | 9th Mar 1939 | Box 109 \ 5 scan0123 | |
| Performance graph comparing a modified SG's engine against the average performance of Bentley and Wraith engines. | 3rd Mar 1939 | Box 109 \ 5 scan0124 | |
| Performance figures of a modified Wraith after fitting new pistons and a cylinder block. | 11th Mar 1939 | Box 109 \ 5 scan0125 | |
| Performance comparison data for a Wraith before and after modifications to the camshaft and pistons. | 11th Mar 1939 | Box 109 \ 5 scan0126 | |
| Graph comparing the horsepower versus RPM of an 'Sg's Engine' with new components against average Bentley and Wraith engines. | 3rd Mar 1939 | Box 109 \ 5 scan0127 | |
| Performance graph comparing an Sg's engine test against average Bentley and Wraith engine curves. | 3rd Mar 1939 | Box 109 \ 5 scan0128 | |
| Telegram advising that Robotham will be sending Kennett to Sidgreaves tomorrow. | 13th Mar 1939 | Box 109 \ 5 scan0129 | |
| Query and response regarding fitting earthing clips to the brake drums of chassis WXA-1 to resolve wireless interference. | 14th Mar 1939 | Box 109 \ 5 scan0130 | |
| Engine pinking issues after modifications, requesting an investigation and a report. | 13th Apr 1939 | Box 109 \ 5 scan0131 | |
| Engine pinking issues, referencing an experimental car and a Bentley for comparison. | 14th Apr 1939 | Box 109 \ 5 scan0132 | |
| Investigating an engine detonation (pinking) issue on car WXA.1, concluding poor quality petrol was the cause. | 17th Apr 1939 | Box 109 \ 5 scan0133 | |
| Movement of a customer's new and old cars to London. | 20th Apr 1939 | Box 109 \ 5 scan0134 | |
| Requesting a report regarding an investigation into the question of pinking. | 14th Apr 1939 | Box 109 \ 5 scan0135 | |
| Engine detonation tests in response to a complaint, particularly in hot weather conditions. | 24th Apr 1939 | Box 109 \ 5 scan0136 | |
| Instructions for fitting special cylinder blocks and associated modifications for WXA.1 and WXA.2 cars. | 12th May 1939 | Box 109 \ 5 scan0137 | |
| From 'Sg.' to 'Rm.' concerning worsening engine detonation in car WMB11 and a proposal for its repair. | 11th Jul 1939 | Box 109 \ 5 scan0138 | |
| Cause of engine detonation and suggesting a diagnostic experiment. | 11th Jul 1939 | Box 109 \ 5 scan0139 | |
| Confirming a 'Discol' fuel experiment eliminated detonation noise and arranging for a car to be sent to Derby. | 11th Jul 1939 | Box 109 \ 5 scan0140 | |
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