They utilised the Morris Minor floorpan, suspension and steering but were fitted with the larger 1,489 cc (90.9 cu in) B-Series engine and MG Magnette gearbox.

The Wolseley was released in April 1957 and the Riley was launched in November, directly after the 1957 London Motor Show.

Interior storage was improved with the fitting of a full width parcel shelf directly beneath the fascia.

In October 1962 the cars received the more robust crank, bearing and other details of the larger 1,622 cc unit now being fitted in the Austin Cambridge and its "Farina" styled clones.

Unlike the Farina models, however, the Wolseley 1500 and Riley One-Point-Five retained the 1,489cc engine size with which they had been launched back in 1957.

[9] 1959 Series I Riley One-Point-Fives were exported to North America by BMC in an attempt to capitalize on the growing imported car market.