 The Province Wellesley "W" series was discontinued in 1957 as "P" plates would be issued for both territories henceforth.The "S" series was assigned to the Straits Settlement of Singapore, which continuously used the basic "S ####" format for several decades until the format was nearly exhausted and subsequently expanded to "Sx ####" after rationalisation in 1948.Following Singapore's expulsion from Malaysia in 1965, the "S" series is no longer administered by the Malaysian Road Transport Department, and fell under the responsibility of the State of Singapore Registry of Vehicles and its successor, the Land Transport Authority; vehicles with Singaporean "S" plates that were under Malaysian ownership were reissued with corresponding Malaysian number plates.