From the 1940s to 1954, Spiers worked part-time as an actuary for the Guardian Assurance Company, and Eagle Star Insurance.

[3] The institute had unanimously approved the admission of women at their general meeting in the previous year.

[2][5][6][7] Three years later, Davis became the first woman to open the discussion at a sessional meeting of the Institute of Actuaries.

After she had made her contribution, the male actuary who followed commented that "those of them who had advocated the admission of women to the Institute had every reason to congratulate themselves".

[1] From the 1940s to 1954, Spiers returned to actuarial work on a part-time basis at the Guardian Assurance Company and Eagle Star Insurance.