1928 Bentley 4½-Litre 'Bobtail' Works Team Le Mans Racer
- Engine
- 4.4L SOHC inline-four with twin SU sloper carburetors, ~150 bhp
- Colour
- Green fabric with matching Parson's Napier Green paintwork

Chassis KM3088 is a 1928 Bentley 4½-Litre 'Bobtail' racing car, one of three factory-prepared Works entries for the 1928 Le Mans 24 Hours, where it retired while leading due to a cracked chassis. The car subsequently participated in the 1928 Shelsley Walsh hillclimb, won the 1929 JCC Double Twelve outright, and finished third in a historic 1-2-3-4 Bentley sweep at the 1929 Le Mans. Driven by notable Bentley Boys including Frank Clement, Sammy Davis, and Dr. Benjafield, KM3088 carries factory Vanden Plas coachwork and has undergone careful preservative restoration to its original Le Mans specification.
Ownership
- —Auction saleEstimate US$6,500,000 – US$7,500,000
- 1928 → 1930Factory deliveryBentley Motors (factory / Racing Shop)full documentation
Built for works racing use; following Le Mans retirement the car was repaired and kept at the Racing Shop, then advertised for sale in August 1928 before being retained for further competition in 1929.
- 1928 → 1930-02-01Private saleSir Ronald Gunterfull documentation
Acquired after the 1928 Le Mans advertisement; co-drove the car in works entries while keeping it maintained at the Bentley Racing Shop through early 1930.
- 1930 → 1933Private saleLauchlan Rosefull documentation
Purchased from Kensington Moir's showroom in the first half of 1930; fitted a new gearbox and replaced the wire-mesh windscreen with glass; documented his tenure in two BDC Review articles.
- 1933 → 1939Private saleLewis Rivers Oldmeadowfull documentation
RAF Ground Instructor who kept the car largely unaltered apart from a new steering wheel; wartime pressures led to a sale in 1939, after which the car's whereabouts became unclear.
- 1939 →Unknown wartime custodiannone documentation
Car was out of sight during the war and stored in damp conditions, resulting in significant deterioration including mildew and rust.
- 1949 →Private saleLauchlan Rosefull documentation
Rediscovered the car post-war in poor condition; commissioned restorations by Bill Shortt and later Tony Townshend's Elmdown Engineering to return it to original Le Mans specification.
- → 2004Private saleBill Lakepartial documentation
Noted pre-war collector who also owned the companion Six Speed team car GF 8507; the Bobtail was sold by his son following Lake's death in 2004.
- 2004 →InheritanceBill Lake's sonpartial documentation
Commissioned a preservative restoration by VBE Restoration to reinstate the car's historic specification; invoices retained in the history file.
- 2012 →Private saleCurrent ownerpartial documentation
Has kept the car in well-maintained condition, preserving its age-appropriate patina.
- Date unknownInheritanceRose familypartial documentation
Retained within the Rose family for approximately 25 years after Lauchlan Rose's ownership before passing to Bill Lake.
Competition
- 19281928 Le Mans 24 HoursDriver: Frank ClementDNF — overheating caused by cracked chassis frame
Co-driven by Dr. J. Dudley Benjafield; ran as car #2 and led the race before a loose water pipe drained the radiator, forcing retirement to the dead-car park.
- 19281928 Shelsley Walsh3rd
First outing after repair following the Le Mans retirement.
- 1929JCC Double Twelve1929 JCC Double TwelveDriver: Sammy Davis2nd overall
Co-driven by Sir Ronald Gunter as car #6; ran in second place early on and finished just behind the leading Alfa Romeo 6C 1500 of Giulio Ramponi by a handicap margin of 0.003.
- 19291929 Le Mans 24 HoursDriver: Dr. J. Dudley Benjafield3rd overall
Co-driven by Baron André d'Erlanger as car #10; endured battery, water pump, and lighting issues, and front brakes were disconnected by mechanics during the race; Bentley achieved a historic 1-2-3-4 finish.
Maintenance & restoration
- 1928RepairBentley Motors
Post-race repairs carried out by Bentley Motors following the 1928 Le Mans retirement; the extent of chassis frame replacement is uncertain.
Whether an entirely new chassis frame was installed or the original was repaired remains undocumented.
- 1930Modification
Installation of the then-new 'D'-type four-speed gearbox and replacement of the original wire-mesh windscreen with a glass unit.
Carried out during Lauchlan Rose's first ownership period; documented in his BDC Review articles.
- 1939Mechanical
Replacement of the throttle cable; last entry recorded on the factory Service Report.
- —RestorationElmdown Engineering
Full restoration commissioned by Lauchlan Rose after rediscovering the car in deteriorated post-war condition; work carried out by Bill Shortt with further work by Elmdown Engineering to return the car to its original Le Mans specification.
Undertaken after Rose's post-war reacquisition; approximate date unknown but after 1949. Tony Townshend's firm completed the finishing work.
- —RestorationVBE Restoration
Preservative restoration undertaken to conserve and return the car to its historically correct specification; invoices retained in the history file documenting the scope and detail of work performed.
Commissioned by Bill Lake's son following the 2004 inheritance; invoices form part of the supporting documentation.
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