Blanche May Gilbert Day was a member of the Conservative and Unionist Women's Franchise Association (CUWFA), who lived at 11 Pittville Villas, Cheltenham; she was a signatory of the 1912 book presented to Sir James Agg Gardner, in recognition of his support for women's suffrage (Gloucestershire Archives, catalogue reference D5130/6/6).

On the 1911 census she was listed as unmarried, and her occupation was given as private means. Her father was a clergyman.

She died on 4 December 1927.