The Rover P4 series is a group of mid-size luxury saloon cars produced by the Rover Company from 1949 until 1964. They were designed by Gordon Bashford.
Their P4 designation is factory terminology for this group of cars and was not in day-to-day use by ordinary owners who would have used the appropriate consumer designations for their models such as Rover 90 or Rover 100.
Production began in 1949 with the 6-cylinder 2.1-litre Rover 75. Four years later a 2-litre 4-cylinder Rover 60 was brought to the market to fit below the 75 and a 2.6-litre 6-cylinder Rover 90 to top the three car range. Several Variations followed.
These cars are very much part of British culture and became known as the "Auntie" Rovers and the "Poor Man's Rolls-Royce". Denis Jenkinson, being totally impressed with the Rover he remarked that the car had tackled the torturous journey just as if going to Auntie's for tea. The term of endearment stuck and forever after the P4 has carried its 'Auntie' nickname." The name was also derived from the feeling that you were sitting on your Auntie's Armchair in the living room.
They were driven by topmost royalty including Grace Kelly.
The P4 series was supplemented in September 1958 by a new conservatively shaped Rover 3-litre P5 but the P4 series stayed in production until 1964 and their replacement by the Rover 2000.