Wow. One out of 640 - I bet she saw herself as more of a socialist though.
Feminism was never really a defining issue on British politics in the same way that say, economics was or suffrage was back in the days when most men and women couldn't vote. Take the Liberals for example: they had a equal pay policy in 1945! Look how many votes it won them IRL - voters of both sexes clearly were more interested in things like the NHS. The campaign for women's rights was more often than not one fought outside of parliament rather than within it (Dagenham comes to mind) and the idea that there might be a Swedish-style Feminist Party in 1950's Britain (I hasten to remind you that there isn't one on 2014) is quite absurd to say the least.
Women's rights might make for some interesting manifesto choices and election issues in the near future (communists or no, 1954 is still a bit early) but it should be done through the existing power blocs: I.e. the Liberal and Socialist parties.