If you've heard in the past or from other books that women used to dominate computing and then were forced out, but you aren't clear about the specifics of how such a process could happen, then Programmed Inequality is a great book about the intersections of labor, sexism, new technology, and governance.

I highly recommend it to programmers and other people working in IT who want to understand how we got to now.

The book does not assume any familiarity with modern British history, and thoroughly explains the government figures and departments involved. The book is also pretty dense, with copious examples to support its interpretations.