Generate a correct and concise answer for the question based on the words in the context.

Context : Bella Sidney Woolf OBE (1877--1960) was an English author, sister of author Leonard Woolf and first married to Robert Heath Lock, and in her second marriage to Hong Kong colonial secretary and colonial Ceylonese administrator Tom Southorn.
Question : What is Bella Sidney Woolf's spouse's name?
Robert Heath Lock