She who must not be named?

Pretty unbelievable that a British Government department would produce a document Women in Power: Milestones which named the woman from politics around the world and the dates of their influence with the exception of naming just one, who happened to hold the highest political office in the land for over a decade.

Click image for Larger Version and look at 1979

Clearly Harriet Harman has delusions that she's Hermione Granger and Thatcher is her Voldemort. Do they whisper "she who must not be named" in her office?

Hat Tip: James Kirkup