Unusually for Spencer, the sitter in this portrait was a professional model. A pencil study of the sitter’s head is in a private collection. In the Gilbert Spencer archive (Arts University Bournemouth), there is a photograph of a pencil sketch of the roof and Glasgow skyline used in the background, dated 1949. This can be securely dated to 1949 by its exhibition history and the existence of a preparatory sketch dated 1949. The preparatory portrait study is from a photograph in the Witt library, its present location is unknown.
We are grateful to Paul Gough and Amy Lim for providing this information through their online catalogue.