Lady Soames, who has died aged 91, was the last surviving child of Winston and Clementine Churchill. Lady Soames was a Vice Patron of the WRAC Association.
In 1941 she joined the ATS, serving in mixed anti-aircraft batteries, and rose to the rank of junior Command (equivalent to the rank of captain). While she was manning the batteries in Hyde Park, her father often used to drop in on her during the course of an air raid. Mary acted as ADC to her father on several overseas trips, including the first Quebec conference in August 1943 between Churchill, President Roosevelt and the Prime Minister of Canada, Mackenzie King. She accompanied him to Potsdam for the Big Three Conference in the summer of 1945, witnessing with amusement Stalin autograph-hunting after dinner. She was demobilised early in 1946 and appointed MBE (military).
This text was taken from the full obituary published in The Telegraph.