Records of outgoing passengers on FindMyPast show a Mr DS King of 99 Birch road, Hundstead, Rochdale (which is in Lancashire), aged 26 and a motor mechanic, travelling with a Mrs King (no initial or forename given), aged 39 (which would mean a date of birth c. 1908), on the Capetown Castle, from Southampton to Capetown, South Africa, departing on 9th January 1947. They were onward bound for Southern Rhodesia.
Also on the same page, though not necessarily in the same travelling party, is a 28 year old Mrs King, of 19 Jobs Lane, Coventry, travelling onwards to Northern Rhodesia.
DrElaine