| Description | Date | Identifier | |
| Whether to sell or dismantle several test cars, including a Phantom chassis. | 24th Jul 1929 | Box 20 \ 11 Scan357 | |
| Typed copy of a letter regarding experimental car bodies and relations with coachbuilders. | 3rd Aug 1929 | Box 20 \ 11 Scan358 | |
| Over-lubrication issues in the 20 HP engine and recommending a new standard piston ring. | 5th Sep 1929 | Box 20 \ 11 Scan359 | |
| The renewal and status of various motor car licences. | 17th Sep 1929 | Box 20 \ 11 Scan360 | |
| Requesting the renewal of a Chrysler's vehicle license until December. | 19th Sep 1929 | Box 20 \ 11 Scan361 | |
| Forwarding a report on Hooper bodies, noting unsatisfactory results with aluminium wings. | 19th Sep 1929 | Box 20 \ 11 Scan362 | |
| Letter discussing a complaint from coachbuilder Hoopers and proposing to send them performance reports on experimental bodies. | 3rd Aug 1929 | Box 20 \ 11 Scan363 | |
| Defects and design issues with experimental car bodies, focusing on cracked aluminium wings and general body design. | 19th Sep 1929 | Box 20 \ 11 Scan364 | |
| Faults and complaints with vehicle coachwork, focusing on rattling doors/windows and severe draughts. | 19th Sep 1929 | Box 20 \ 11 Scan365 | |
| Fault report detailing issues such as loose screws, rattles, and inadequate fittings, with a specific focus on a Cabriolet body mounted on chassis 19-EX. | 19th Sep 1929 | Box 20 \ 11 Scan366 | |
| Summary of common faults found in vehicle bodies, noting issues with wings, doors, windows, and fittings. | 30th Sep 1929 | Box 20 \ 11 Scan367 | |
| Requesting that coachbuilders be allowed to see their experimental bodies with notes on their performance. | 30th Sep 1929 | Box 20 \ 11 Scan368 | |
| Road traffic accident involving experimental car number 14 G 4. | 7th Oct 1929 | Box 20 \ 11 Scan369 | |
| Finish options for experimental chassis, comparing Staybrite, stainless steel, and chromium. | 15th Oct 1929 | Box 20 \ 11 Scan370 | |
| Status and allocation of cars in the Experimental Department. | 22th Oct 1929 | Box 20 \ 11 Scan371 | |
| Proposed new features for an Experimental Enclosed Limousine Phantom II for testing. | 7th Dec 1929 | Box 20 \ 11 Scan372 | |
| 'C' Type Steering design changes and a proposal to sell an experimental Phantom II. | 7th Dec 1929 | Box 20 \ 11 Scan373 | |
| From F.H.R. to C.J. discussing a possible new engine design inspired by the Austrian Daimler. | 27th Jun 1910 | Box 21 \ 1 Scan001 | |
| Letter to Mr. Royce providing particulars of Cody's 120 HP six-cylinder Austro-Daimler Engine. | 14th Oct 1912 | Box 21 \ 1 Scan002 | |
| Short memo discussing an assessment of Cody's 120 HP six-cylinder Austro-Daimler Engine. | 21th Oct 1912 | Box 21 \ 1 Scan003 | |
| Proposal to purchase a 19/70 HP Austro-Daimler for evaluation, with a brief comparison to the Bentley. | 13th Oct 1925 | Box 21 \ 1 Scan004 | |
| Arranging a trial run for a 40 HP Fiat and a trial run for an Austro-Daimler on the same day. | 15th Oct 1925 | Box 21 \ 1 Scan005 | |
| Arranging trial runs on Fiat and Austro-Daimler cars. | 15th Oct 1925 | Box 21 \ 1 Scan006 | |
| From Hs to CJ regarding sending an assistant to test Fiat and Austro-Daimler cars. | 19th Oct 1925 | Box 21 \ 1 Scan007 | |
| Request for particulars on a tested Austro-Daimler car. | 22th Oct 1925 | Box 21 \ 1 Scan008 | |
| Car road test reports for a 40 HP Fiat and a 19-HP Austro-Daimler. | 23th Oct 1925 | Box 21 \ 1 Scan009 | |
| The road trial of a 40 HP Fiat. | 20th Oct 1925 | Box 21 \ 1 Scan010 | |
| Page 2 of an experimental report detailing issues with tappet knocks, lubrication, gearbox, and clutch. | 12th Jun 1925 | Box 21 \ 1 Scan011 | |
| The performance of a vehicle's brakes and steering systems. | 23th Oct 1925 | Box 21 \ 1 Scan012 | |
| The rear axle, suspension, and road performance of a car. | 23th Oct 1925 | Box 21 \ 1 Scan013 | |
| Vehicle acceleration, engine performance, and braking characteristics. | 23th Oct 1925 | Box 21 \ 1 Scan014 | |
| Braking issues, a gear growl, and a general impression of a vehicle's performance. | 12th Jun 1925 | Box 21 \ 1 Scan015 | |
| Experimental road trial report on an Austro-Daimler car. | 20th Oct 1925 | Box 21 \ 1 Scan016 | |
| The performance of the camshaft, gearbox, clutch, and steering systems. | 23th Oct 1925 | Box 21 \ 1 Scan017 | |
| The performance of various vehicle components like brakes, axle, suspension, and cooling. | 23th Oct 1925 | Box 21 \ 1 Scan018 | |
| Vehicle's on-road performance, including hill climbing, acceleration, and maximum speed. | 23th Oct 1925 | Box 21 \ 1 Scan019 | |
| Comparing a 20 HP car with an Austro-Daimler, including a performance graph and general impressions. | 12th Jun 1925 | Box 21 \ 1 Scan020 | |
| Overhead camshaft engine design and a comparison to a Chrysler. | 23th Oct 1925 | Box 21 \ 1 Scan021 | |
| Providing particulars for an Austro-Daimler vehicle. | 23th Oct 1925 | Box 21 \ 1 Scan022 | |
| Query regarding the performance and specifications of a tested Austro-Daimler 19/70 HP unit. | 26th Oct 1925 | Box 21 \ 1 Scan023 | |
| Letter from coachbuilder Barker & Co. regarding the guaranteed speed of an Austro-Daimler chassis. | 31th Oct 1925 | Box 21 \ 1 Scan024 | |
| Letter to coachbuilders Messrs. Barkers regarding vehicle speed limitations due to body design and wind resistance. | 4th Nov 1925 | Box 21 \ 1 Scan025 | |
| Letter from Barker & Co. Coachbuilders regarding a guaranteed speed of 70 mph for a car. | 5th Nov 1925 | Box 21 \ 1 Scan026 | |
| Visit to the Paris Show to test competitor cars, specifically the Austro Daimler and Tracta for their suspension. | 27th Sep 1928 | Box 21 \ 1 Scan027 | |
| Performance trial report for a Bentley with an open touring Weyman body, comparing its acceleration to a G.11 vehicle. | 18th Sep 1924 | Box 21 \ 2 Scan001 | |
| Comparing the performance of a Bentley car with a Weyman body against a 20 HP Rolls-Royce (G.11). | 22th Sep 1924 | Box 21 \ 2 Scan002 | |
| Effective lubrication system of the Bentley car and suggesting a review for potential application. | 10th Oct 1925 | Box 21 \ 2 Scan003 | |
| Potential purchase and analysis of competitor vehicles, the Austro-Daimler and the Bentley. | 13th Oct 1925 | Box 21 \ 2 Scan004 | |
| Assessing a competitor's 40 HP Bentley car, evaluating its engine and chassis design. | 13th Oct 1925 | Box 21 \ 2 Scan005 | |
| Weight saving strategies and performance comparisons for the New Phantom model. | 13th Oct 1925 | Box 21 \ 2 Scan006 | |
| Request for information on the number and type of lubricating points on a Bentley chassis. | 15th Oct 1925 | Box 21 \ 2 Scan007 | |
| Suggesting the trial of duralumin rockers to reduce 'Phantom' weight, noting Bentley's use of the material. | 15th Oct 1925 | Box 21 \ 2 Scan008 | |
| Comparing the performance of the new 6 1/2 Litre Bentley to the New Phantom. | 23th Oct 1925 | Box 21 \ 2 Scan009 | |
| Page comparing performance and specifications for various cars including the Phantom, Bentley and Fiat. | 23th Oct 1925 | Box 21 \ 2 Scan010 | |
| Hand-drawn graph comparing the Flywheel Brake Horsepower (B.HP) of a 'New Phantom' and a 'Bentley' against engine RPM. | 9th Dec 1925 | Box 21 \ 2 Scan011 | |
| Internal note requesting views following a test run of a 6-cylinder Bentley car. | 9th Dec 1925 | Box 21 \ 2 Scan012 | |
| Cover note for a report on a test run of a 6-cylinder Bentley car. | 10th Dec 1925 | Box 21 \ 2 Scan013 | |
| Test drive in a new six-cylinder Bentley, comparing its performance to the 'Phantom' model. | 12th Dec 1925 | Box 21 \ 2 Scan014 | |
| Letter to Hives arranging a test of a friend's 6-cylinder Bentley. | 5th Jul 1926 | Box 21 \ 2 Scan015 | |
| Letter regarding the performance of a Phantom car and its Lucas magneto. | 6th Jul 1926 | Box 21 \ 2 Scan016 | |
| Letter discussing the opportunity to test a 6-cylinder Bentley. | 6th Jul 1926 | Box 21 \ 2 Scan017 | |
| Test report on the suspension, power, and performance of a 6-cylinder Bentley car. | 23th Jul 1926 | Box 21 \ 2 Scan018 | |
| Vehicle performance issues including engine detonation, various noises, poor slow running, a jagging clutch, and a steering wobble. | 23th Jul 1926 | Box 21 \ 2 Scan019 | |
| Competitive analysis report on a Bentley vehicle, detailing issues with cooling, brakes, and oil consumption. | 17th Jul 1992 | Box 21 \ 2 Scan020 | |
| Request for chassis cards for a client, including an address and noting that payment is awaited. | 17th Jul 1992 | Box 21 \ 2 Scan021 | |
| Blueprint graph comparing the acceleration of various Bentley and Phantom models against road speed. | 1st Aug 1926 | Box 21 \ 2 Scan022 | |
| Comparison and analysis of reversed and rebound leaf springs as fitted to Lancia and Bentley cars. | 1st Aug 1926 | Box 21 \ 2 Scan023 | |
| Graph plotting spring compression against total load for a Woodhead Special Spring D. | 10th Aug 1926 | Box 21 \ 2 Scan024 | |
| Reverse side of a document showing a print room stamp from Derby. | 10th Aug 1926 | Box 21 \ 2 Scan025 | |
| Performance graph of deflection versus load for Lancia reversed leaf springs. | 10th Aug 1928 | Box 21 \ 2 Scan026 | |
| With a red rectangular date stamp in the bottom right corner. | 10th Aug 1928 | Box 21 \ 2 Scan027 | |
| Discrepancy in the stated ground clearance of a six-cylinder Bentley car. | 12th Nov 1926 | Box 21 \ 2 Scan028 | |
| Performance tests on a modified 20 HP car, comparing it to the standard Phantom. | 3rd Dec 1926 | Box 21 \ 2 Scan029 | |
| Graph comparing the acceleration performance of various vehicle models and configurations. | 3rd Dec 1926 | Box 21 \ 2 Scan030 | |
| Page with a receiving stamp from the Print Room in Derby. | 3rd Dec 1926 | Box 21 \ 2 Scan031 | |
| Two graphs comparing vehicle acceleration: Rolls Royce vs Bentley and High vs Low Axle Ratio. | 3rd Dec 1926 | Box 21 \ 2 Scan032 | |
| Performance graphs showing acceleration and velocity for a 20 HP engine with different configurations. | 3rd Dec 1926 | Box 21 \ 2 Scan033 | |
| Two graphs comparing acceleration performance for different 20 HP engine configurations. | 3rd Dec 1926 | Box 21 \ 2 Scan034 | |
| Two graphs comparing acceleration performance between a Rolls-Royce and a Bentley, and between different axle ratios. | 3rd Dec 1926 | Box 21 \ 2 Scan035 | |
| Two acceleration performance graphs comparing different engine configurations and car models. | 3rd Jan 1927 | Box 21 \ 2 Scan036 | |
| Blank document page with a Print Room stamp. | 3rd Jan 1927 | Box 21 \ 2 Scan037 | |
| Introductory document discussing car performance, specifically acceleration and the attached comparison curves. | 19th Nov 1926 | Box 21 \ 2 Scan038 | |
| Customer feedback on the 6-cylinder Bentley and its performance comparison to a Phantom and Sunbeam. | 25th Mar 1927 | Box 21 \ 2 Scan039 | |
| Typed note discussing a Bentley vehicle, a job by Vanden Plas, and interest in 6-cylinder models. | 24th Oct 1927 | Box 21 \ 2 Scan040 | |
| Recommending the purchase of a Stutz car for evaluation purposes over a Packard-8. | 24th Oct 1927 | Box 21 \ 2 Scan041 | |
| Road trial report from the 1927 Motor Show comparing a 6-cylinder Bentley to a Phantom. | 24th Oct 1927 | Box 21 \ 2 Scan042 | |
| Continued road test report and analysis of competitor cars including a Daimler and a Stutz. | 24th Oct 1927 | Box 21 \ 2 Scan043 | |
| Comparative analysis and road test report on Stutz, Bugatti, and Lea Francis cars. | 29th Feb 1928 | Box 21 \ 2 Scan044 | |
| Requesting information and a potential trial of the 4 ½ litre Bentley. | 29th Feb 1928 | Box 21 \ 2 Scan045 | |
| Arranging a test run of a competitor's six-cylinder Bentley Saloon to evaluate its steering and chassis. | 13th Jun 1928 | Box 21 \ 2 Scan046 | |
| Road testing a 6-cylinder Bentley under high-speed conditions to investigate wobbles. | 14th Jun 1928 | Box 21 \ 2 Scan047 | |
| Arranging a test drive for a six-cylinder Bentley in Cambridge, focusing on road conditions for testing steering control. | 15th Jun 1928 | Box 21 \ 2 Scan048 | |
| The postponement of a Bentley test, rescheduling it for the following Wednesday in Cambridge. | 19th Jun 1928 | Box 21 \ 2 Scan049 | |
| Confirming a meeting arrangement at The University Arms, Cambridge. | 9th Jun 1928 | Box 21 \ 2 Scan050 | |
| Letter discussing the springing arrangement for Chassis No. 29-CL, including the use of Continental springs and Hartford dampers. | 20th Jun 1928 | Box 21 \ 2 Scan051 | |
| Telegram from Northey to Hives postponing the Cambridge test due to a funeral. | 22th Jun 1928 | Box 21 \ 2 Scan052 | |
| Letter to the Royal Automobile Club from a car owner requesting a suitable road for a high-speed steering test. | 22th Jun 1928 | Box 21 \ 2 Scan053 | |
| Letter to The Royal Automobile Club concerning a suitable road found between Earith Bridge Station and Sutton. | 28th Jun 1928 | Box 21 \ 2 Scan054 | |
| Letter from the Royal Automobile Club to W. A. Robotham suggesting four straight roads for potential testing. | 23th Jun 1928 | Box 21 \ 2 Scan055 | |
| Road test comparing the steering and high-speed wobble characteristics of a 6 1/2 Litre Bentley with a 10-EX car. | 28th Jun 1928 | Box 21 \ 2 Scan056 | |
| | | | |
