Harriet Jones, former PM, taking one for the universe on Saturday night*.
[I have, of course, modelled her crown on that of King Edred, who reigned circa 946-955, and was known as 'weak-in-the-feet'.]
Not to be confused with…
Harriet Jones, Young Miss Jones The Younger. PM circa 2040.
[*Should HJ PM return to seal the Doctor's downfall in some way on Saturday, the honour will not be revoked, due to the all-conquering wonder of Penelope Wilton.]