 By the 1920s, the introduction of fines in lieu of short prison sentences in combination with the introduction of old age pensions led to a significant decrease in the female prison population, in particular those serving short sentences.Around May 1927, Size was appointed Deputy Governor at Holloway Prison (which had become a women's only prison in 1902) and was the first woman to hold the post and the only woman in the UK to hold an equivalent role.By 1934, Holloway was the largest women's prison in the UK, holding 370 women prisoners out of a total population of about 800 women prisoners across all UK prisons.