| Description | Date | Identifier | |
| Secret memo discussing an exhaust roar issue, proposing a new type of rear silencer, and mentioning a Bentley car. | 11th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan181 | |
| Request from Mr. Royce to trial an experimental rubber-isolated rear gearbox suspension. | 13th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan182 | |
| Sending a car to Derby for piston replacement and its subsequent performance. | 16th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan183 | |
| Confirmation of a telegram arranging a meeting. | 22th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan184 | |
| Modifications to the crankshaft and wheelcase for an improved slipper flywheel and spring drive. | 26th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan185 | |
| Proposed modifications to an SS exhaust system, including a new silencer and pipe diameter reduction. | 26th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan186 | |
| First drawings for an experimental epicyclic 3rd speed gearbox. | 26th Jul 1929 | West Wittering \ T \ March1929-December1929 Scan187 | |
| Effects of increasing the water space between radiator tubes. | 13th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan188 | |
| Modifications to the SS exhaust system, including a new expansion box and reduced pipe diameter. | 15th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan189 | |
| Failed modification to the clutch trunnion lubrication system and the dispatch of a replacement nozzle for a 20HP model. | 20th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan190 | |
| List of required alterations and improvements for a 20HP car, model 16-G-4. | 20th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan191 | |
| Design differences and suggestions for the 20HP side spare wheel carrier. | 22th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan192 | |
| Requesting a report on the position of the freewheel in the sideshaft on the 20HP gearbox. | 22th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan193 | |
| Design of the 20HP transmission, specifically the freewheel and clutch arrangement. | 24th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan194 | |
| Modifications and suggestions for the 20HP side wheel carrier. | 28th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan195 | |
| Design modifications for the 20HP side wheel carrier, including a sketch with dimensions. | 29th Aug 1929 | West Wittering \ T \ March1929-December1929 Scan196 | |
| Wheel arch clearance issues and fouling on 'WJ' series cars, with test results and proposed modifications. | 4th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan197 | |
| Modifications to wheel arch clearances and revised instructions to coachbuilders. | 4th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan198 | |
| Drawing showing a revised arch with notes on a new clearance for the axle. | 5th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan199 | |
| Geometric investigation into rear wheel arch clearance issues on the new SS cars compared to the Phantom. | 5th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan200 | |
| Wheel arch clearance, suspension oscillation, and rolling tests for the Phantom model. | 17th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan201 | |
| Proposal to adapt existing 20HP and 45HP car dynamos into 1/4HP, 50-volt motors. | 17th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan202 | |
| Modifications to the SS. Exhaust System and its spring anchorage. | 20th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan203 | |
| Fitting of an epicyclic third speed gear to an experimental car, including required modifications. | 21th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan204 | |
| Alterations to the epicyclic 3rd speed gear clutch. | 21th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan205 | |
| Development of sports cars, specifically the Phantom II and 20HP models, including body type and power enhancements. | 24th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan206 | |
| Modification to the dashboard pump to prevent oil leaks and improve assembly. | 27th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan207 | |
| Recent 'Japan' improvements to the 20HP clutch. | 1st Oct 1929 | West Wittering \ T \ March1929-December1929 Scan208 | |
| Ongoing issues with rear wheel arch clearances on the Phantom II model. | 2nd Oct 1929 | West Wittering \ T \ March1929-December1929 Scan209 | |
| Requirements and proposed schemes for induction pipe heating on the Phantom II. | 4th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan210 | |
| Scheme for thermostatically operated radiator shutters and modifications for the 20HP chassis. | 5th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan211 | |
| Considerations and strategy for developing supercharged car engines, comparing different cylinder configurations and referencing competitors. | 10th Sep 1929 | West Wittering \ T \ March1929-December1929 Scan212 | |
| Comparison of the 20HP gearbox with a freewheel in the sideshaft against the De Lavaud scheme. | 11th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan213 | |
| Phantom II's performance at Brooklands, focusing on achieving higher speeds through axle ratio changes and ride quality improvements. | 11th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan214 | |
| Proposed performance improvements for the 20HP car engine and chassis. | 10th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan215 | |
| New radiator filter designed to collect sediment from the cylinder block. | 14th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan216 | |
| Inquiring about the status and approved position of a front numberplate. | 15th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan217 | |
| Modification to the Phantom II clutch. | 15th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan218 | |
| Confidential and secret memorandum regarding the future strategy and potential improvements for the 20HP chassis. | 17th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan219 | |
| The Sports Phantom II rear axle, discussing a revision to the bevel axle and comparing it with a hypoid axle design. | 23th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan220 | |
| Sending N. scheme 2972, detailing the 13/41 hypoid gears required for the Sports Phantom rear axle. | 25th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan221 | |
| Wheel arch clearances concerning rear seats, tyre rubbing, and potential modifications. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan222 | |
| Report from Paris comparing the acceleration of American versus British chassis. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan223 | |
| Proposing tests on frames with increased vertical stiffness for the Phantom II and 25HP models to improve radiator steadiness and steering. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan224 | |
| Potential modifications to the 25HP radiator and lowering the transmission line using a hypoid back axle. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan225 | |
| Required specifications for a hypoid gear on the back axle of the Phantom II Sports Car. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan226 | |
| Technical memorandum discussing the differences between American and English car springing and damping systems. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan227 | |
| Scheme 2974 for an SS Rear Axle with an 11/41 hypoid ratio. | 26th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan228 | |
| Design options for the Phantom II exhaust heated throttle and silencer system. | 28th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan229 | |
| Proposal to supercharge the 'twenty' model engine. | 29th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan230 | |
| Fitment issues of a larger Dunlop tyre on a Phantom II spare wheel carrier. | 30th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan231 | |
| Brake performance issues on the Phantom II, specifically pedal feel, sponginess, and clearances. | 30th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan232 | |
| Quality and appearance of chromium plating on parts from Derby. | 30th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan233 | |
| Arrangement of a 3-wire, 50V electrical system with a two-speed armature. | 31th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan234 | |
| Proposal for an integrated starter protection and lubrication indicator system for the Phantom II model. | 31th Oct 1929 | West Wittering \ T \ March1929-December1929 Scan235 | |
| Modifications for the introduction of a larger 2' diameter crankpin for the 20HP engine. | 2nd Nov 1929 | West Wittering \ T \ March1929-December1929 Scan236 | |
| Power increase modifications for the 'China' 25HP engine, including timing, valve, and pipe specifications. | 4th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan237 | |
| Particulars of a camshaft and valve spring. | 4th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan238 | |
| Modified bonnet, radiator, and dash for the 25HP chassis. | 4th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan239 | |
| Engine improvements for 'China' based on modifications previously made for 'Japan'. | 5th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan240 | |
| Scheme for the automatic lubrication of the Phantom II clutch spigot bearing from the gearbox. | 6th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan241 | |
| Modifications to the Phantom II clutch, including a proposal from Mr. Royce. | 6th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan242 | |
| Modifications to the 20/25HP clutch, including the use of Ferodo lining. | 6th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan243 | |
| Modifications for automatic lubrication of the 20/25HP 'JAPAN' clutch spigot bearing, suggesting experimental application. | 6th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan244 | |
| 20HP scuttle isolation and revised subframe for model 14-G.4, requesting prints for coachbuilders. | 7th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan245 | |
| Modifications for dropping the 20HP radiator 2 inches into the frame. | 8th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan246 | |
| Safety issue with the 20HP front axle control during braking. | 8th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan247 | |
| Arguing against the purchase of a 2-litre Alfa Romeo to instead focus on improving the 20HP model. | 8th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan248 | |
| Dispatch of an inlet and exhaust manifold, and a cylinder head for the 'China' project. | 9th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan249 | |
| Schematics for a Hooper Faux Cabriolet Phantom II for the Riviera Trials. | 11th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan250 | |
| Designs for a 20-25HP Windover Open Touring Car for the 1930 Riviera season trials. | 11th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan251 | |
| Progress update on development projects codenamed 'China' and 'Japan', covering cylinder heads, valves, and a hypoid axle. | 11th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan252 | |
| Wiring modifications and alternative designs for a starter protection system. | 11th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan253 | |
| Drawings of two close-coupled body designs for a Phantom II European Propaganda Car. | 11th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan254 | |
| New replacement body for an experimental enclosed limousine on a 20-25HP long chassis. | 11th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan255 | |
| Causes and potential solutions for brake clanking and sponginess. | 12th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan256 | |
| Alternative schemes for a front expansion box for the China exhaust system. | 15th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan257 | |
| From DA to HS regarding design challenges with the 20HP front axle control. | 15th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan258 | |
| Modifications to a Phantom II vehicle for the Prince of Wales. | 15th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan259 | |
| Opinion on the insufficient current output of the 20HP dynamo. | 16th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan260 | |
| Analysis of test results comparing long and short duration cams on a Standard 20/25HP engine. | 16th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan261 | |
| Trials of longer duration cams and greater tappet clearance on the 25HP 'CHINA' engine. | 16th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan262 | |
| Drawing for an exhaust pipe related to immediate modifications for 'ChinaNAL'. | 18th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan263 | |
| Alternative methods for modifying the leverage on the Phantom II brakes. | 18th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan264 | |
| Modifications to the body subframe for the 20/25HP long chassis. | 19th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan265 | |
| Modification options for a 25HP engine and the resulting horsepower outputs. | 19th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan266 | |
| Letter to Park Ward & Co. commissioning an experimental enclosed limousine for Mr. Royce, detailing various design schemes. | 19th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan267 | |
| Confidential letter regarding the subframe, floor, and body modifications for a car to be used personally by Mr. Royce. | 21th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan268 | |
| Battery overcharging, dynamo output, the 'green light scheme', and the efficiency of various lighting systems. | 21th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan269 | |
| Merits and processes of chromium plating versus nickel silver and Staybrite for various car parts. | 21th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan270 | |
| Causes and potential solutions for radiator blockage. | 22th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan271 | |
| Confidential memorandum discussing engine performance, chassis gearing, and modifications for the 20/25HP model. | 22th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan272 | |
| Knocking in 20HP rear shock dampers and potential design changes. | 25th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan273 | |
| Brief memo regarding a suggestion about Phantom II brakes. | 25th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan274 | |
| Sketch for a new test radiator with cleanable passages and an intercepting self-cleaning filter. | 25th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan275 | |
| Issue with lowering the springs on a 20HP front axle. | 26th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan276 | |
| Short memo sending additional information regarding F-type carburettors in the Vee. | 26th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan277 | |
| Design, manufacture, and cost of Phantom II road springs. | 26th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan278 | |
| Lubrication system for the universal and sliding joints on a 20/25 HP experimental car chassis. | 26th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan279 | |
| Design and standardisation of bonnet locks for the Phantom II. | 26th Nov 1929 | West Wittering \ T \ March1929-December1929 Scan280 | |
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