Amalgamated Drawing Office

Specialist Division codes

The Specialist Division encompassed Rover and Triumph. Only four projects were ever pursued during its existence before the division was renamed Jaguar Rover Triumph, and integrated within Leyland Cars in 1976.

• SD1 Rover 3500/2300/2600, Rover P6 replacement, launched in 1976. The "Rover SD1" name entered the public domain as an umbrella term for this whole model series, even though it was never officially used in the marketing of the cars.
• SD2 Proposed Triumph Dolomite replacement, was abandoned in 1975 for the ADO77 studies.
• SD3 Rover 213/216 - the SD3 code was used for the 1984 Triumph Acclaim replacement, even though the Specialist Division itself had long been disbanded within BL, and Rover was now part of the Austin Rover Group, therefore logically the LC or AR convention would have been used.
• SD5 Proposed Land Rover replacement^[13]
• TM1 Joint replacement for the Triumph Dolomite/Sprint and the Morris Marina. This superseded the cancelled SD2 and ADO77 projects, but this too was scrapped and replaced by the LM10 and LM11 (Austin Maestro/Montego).

LC/LM/AR codes

Following the various reorganisations of BMC, and the creation of the combined Leyland Cars division of British Leyland, the codes changed to LC in the mid 1970s.^[14] Following the merger of Rover's Specialist Division SD codes, these resulted in LM (Light Medium) codes.

• LC8 Austin Metro, referred to as ADO88 in early development
• LC9 Triumph Acclaim, also referred to as "Project Bounty" during early development.
• LC10 Austin Maestro, later becoming LM10, referred to as ADO99 in early development.
• LC40 Jaguar sedan, used this designation during 1977, reverted back to XJ40 for 1978
• LM11 Austin Montego,^[15] referred to as LC11 in early development
• LM12 Proposed coupe version of Maestro, cancelled
• LM14 Proposed hatchback derivative of the Montego, cancelled
• LM15 Proposed replacement for the Rover SD1; dropped in favor of Project XX and eventually the Rover 800^[16]

There was also a short lived "AR" code following the renaming of BL Cars Ltd to Austin Rover in 1982. Most of the AR-designated projects were either abandoned or were renamed using the Rxx convention (see below)

• AR5 Proposed replacement for the Rover 213/216. Scheduled for a 1989 release, but was cancelled in favor of the AR8.
• AR6 Austin Metro replacement - was scaled back in scope and became the R6 Rover Metro programme, launched in 1990.
• AR8 Proposed replacement for the Rover 214/216. Evolved into the R8 Rover 200-series in 1988.
• AR9 Austin Montego facelift. Launched in mid 1988. This was the only AR- designated project to make it into production.
• AR16 A reskinned Austin Montego with new exterior panels to continue the styling language of the Rover 800, along with a five door hatchback variant designated as AR17. Was abandoned in favour of the "Syncro" project - which became the Rover 600

R codes & others used by the Rover Group

After British Leyland (now BL plc) was renamed Rover Group and its subsequent re-privatisation and sale to British Aerospace (and later, BMW), project codes in the 'Rxx format were generally used, although some projects were given alternative designations or sometimes names. Projects in this series were not numbered consecutively, unlike the earlier conventions. The later RD code was used for projects undertaken by MG Rover from 2000 onward, to that company's collapse in 2005.

R and RD codes

• R3 Series III Rover 200/25 (1995-2005)
• R6 Rover Metro/100 (1990-1997) Was originally AR6, which would have been an all-new Metro replacement - R6 ended up becoming a major facelift and re-engineering of the original 1980 Austin Metro (ADO88/LC8)
• R6X Alternative styling proposal for R6.
• R7 Hatchback based on shortened R8 platform, styling taken from the R6X.
• R8 Series II Rover 200/400 (1989-1995) Was initially known as "YY" (after the original Rover 800's "XX" designator) and AR8.
• R9 Sedan based on the R8. Cancelled in favor of a Rover version of the Honda Concerto.
• R17 Rover 800 MkII hatchback (1992-1998)
• R18 Rover 800 MkII sedan
• R30 Rover 25/45 replacement. Proposed for a 2002-03 launch, but was abandoned following the sale and break-up of the Rover Group by BMW.
• R40 Rover 75 (1998-2005)
• R50/R53/R59 MINI - this was the only Rxx code to be carried over following the spin-off of the MINI brand into BMW.
• RD60 (later RDX60) Mid-range saloon positioned below the Rover 75, but was abandoned following MG Rover's collapse in 2005.
• RD110 Rover CityRover (2003-2005)

Others

• Adder MG RV8 (1992-1995)
• Core Rover 75, later designated Isis and RD1
• Pathfinder An aborted recreational vehicle which would have carried Rover branding. This ultimately evolved into the CB14 project Land Rover Freelander
• HH-R Rover 400/45 (1995-2005) Also known as "Theta" during its development.
• PR1/PR2/PR3 These projects would ultimately evolve into the MGF
• Syncro Rover 600 (1993-1998)
• XX Rover 800 Mk.1 and Sterling (1986-1992), initially known as HD17. The corresponding Honda sister car, the Legend was designated "HX".
• YY Rover 214/216. Renamed AR8 in 1986. The Honda version, the Concerto, was designated "HY".