There is one of a suffragrette already, Trisher, though not actually in Parliament. This is from tanith's link:
"5. Emmeline Pankhurst, Millbank, SW1
AG Walker’s bronze of Emmeline Pankhurst stands at the entrance to Victoria Tower Gardens next to the Houses of Parliament. As leader of the Suffragettes, Pankhurst engaged in militant tactics to achieve her goal of votes for women, something only fully realised in 1928 – the year she died."
Are the statues in Parliament all of MPs?