Conceived to replace the ADO17 models, the ADO71 Austin Princess was in development in 1971. Harris Mann had just worked on the Austin Allegro and designed a controversial wedge-shaped Project Condor which was taken up for ADO71. Mann's design was a 5-door hatchback, but fearing it might take sales from the Austin Maxi, the tail was filled with glass and bootlid until the later Austin Ambassador revision. In March 1975 ADO71 was launched as the 18-22 series in Austin, Morris and Wolseley versions, with 1798cc B-series or 2226cc 6-cylinder E-series engines. The first change to the car came in September 1975 when the Austin and Morris names were dropped and cars rechristened 'Princess' (or 'Leyland Princess' to many people), and the Wolseley badge disappeared forever. Princess 2 was launched in 1978, replacing the B-series 1800cc engine with new 1695cc and 1993cc O-series engines. In 1982 the Princess went in for a major makeover, emerging as the 5-door Austin Ambassador restyled by Harris Mann. In 1984 the Austin Montego replaced the Austin Ambassador.