Well, this is cool: JISC’s journal archives now include Spare Rib, and selected highlights from Spare Rib are introduced at a British Library page. From the British Library page:
Spare Rib was an active part of the emerging women’s liberation movement in the late 20th century. Running from 1972 – 93, this now iconic magazine challenged the stereotyping and exploitation of women, while supporting collective, realistic solutions to the hurdles women faced. Spare Rib became the debating chamber of feminism in the UK, and it now provides a valuable insight into the lives of women in this period.