This lady is surely the wife of the Rev. Robinson Whittaker of the London Mission.
From a 1940 edition of "The War Cry": At a meeting in Rivercourt Church, Hammersmith: "The Rev. Robinson Whittaker, Secretary of the Methodist London Mission, who in a fervent speech which profoundly stirred the congregation, pleaded for the return of The Army's militant note to all sections of the Christian Church and pledged Methodism to support The Army with its prayers and co-operation."
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