Question: What is the name of the British car that debuted at the Earls Court Motor Show, London, on 20 September 1948, from which the floorpan, suspension and steering were utilised for the Riley One-Point-Five?
Context: The Riley One-Point-Five and similar Wolseley 1500 are automobiles which were produced by Riley and Wolseley respectively from 1957 to 1965.  They utilised the Morris Minor floorpan, suspension and steering but were fitted with the larger 1489 cc B-Series engine and MG Magnette gearbox.  The two models were differentiated by nearly 20 hp (15 kW), the Riley having twin SU carburettors giving it the most power at 68 hp (50 kW).  The Wolseley was released in April 1957 and the Riley was launched in November, directly after the 1957 London Motor Show. London Motorfair (London Motor Show) was an alternative London auto show to the British International Motor Show, that was held at Earls Court biannually from 1977 to 1999.  In 1993, when the event won the support of the Society of Motor Manufacturers and Traders (SMMT) and P&O Events, the name changed from "Motorfair" to "The London Motor Show". The Morris Minor is a British car that debuted at the Earls Court Motor Show, London, on 20 September 1948.  Designed under the leadership of Alec Issigonis, more than 1.3 million were manufactured between 1948 and 1972 in three series: the MM (1948 to 1953), the Series II (1952 to 1956) and finally the 1000 series (1956 to 1971). The Austin A90 Atlantic is a British car that was produced by the Austin Motor Company from 1949 to 1952.  It was launched initially as a four-seat convertible, making its début at the 1948 Earls Court Motor Show in London, with production models built between spring 1949 and late 1950.  A two-door coupé, marketed as the A90 Atlantic Sports Saloon, followed a year later.  It had been previewed at the 1949 Motor Show and was in production at Longbridge between 1950 and 1952. The Ford Cirrus concept car was a production car supplied by Ford of Britain and restyled by Woodall-Nicholson Ltd.  It was first shown in 1972 at the Earls Court Motor Show.  The Cirrus was a result of the IBCAM British Styling Competition 1970, run by the Daily Telegraph Magazine.  The prize, to have the car made in real life, £400 and two return tickets to East Africa and a stay in the Inter-Continental hotel Nairobi.  At the time, the car was reported to have cost £25,000 to build. The Riley 16 hp is a car made by the British Riley company from 1937 to 1940.  It slotted into Riley's range immediately below their 18 hp V8 model.  Announced in September 1937 for the Earls Court Motor Show it became one of the two genuine Riley models in the rationalised range that followed the 1938 takeover by the Nuffield Organization. The Bentley Mark V was Rolls-Royce's second Bentley model.  Intended to have been announced at the Earls Court Motor Show set down for late October 1939 it had much in common with its predecessor.  War was declared on 3 September 1939 and a few days later Bentley announced it had ceased production of civilian items. The Morgan Plus 4 Plus or +4+ was an attempt by the Morgan Motor Company to modernize the bodywork, somewhat similar to the Aero 8.  Announced at the 1963 Earls Court Motor Show, only 26 were built, due to poor sales, in spite of its performance. The Austin A30 is a small family car produced by Austin from May 1952 to September 1956.  It was launched at the 1951 Earls Court Motor Show as the ""New" Austin Seven" and was Austin's competitor with the Morris Minor. The Earls Court Boat Show was first held in December 2007 at the Earls Court Exhibition Centre.  This venue had previously hosted the long-established London Boat Show until its move to London's ExCeL Exhibition Centre in 2004.
Answer: Morris Minor