Sonia Holm was born in Sutton, Surrey in 1920.   Her film debut was in the Goggie Withers film “The Loves of Joanna Godden” in 1947.   Her other films include “When the Bough Breaks” with Patricia Roc, “Miranda” with Glynis Johns and “Broken Journey” with Phyllis Calvert.   She died in 1974.

IMDB entry:

Sonia Holm was born on February 24, 1922 in Sutton, Surrey, England as Dorothy Mary Sonia Freeborn. She was an actress, known for Radio Cab Murder (1954), 13 East Street(1952) and Miranda (1948). She was married to Patrick Holt. She died on July 2, 1974 in Oxford, England.