This is a Discworld / Dr. Who crossover Drabble set around the end of the last season, and with spoilers for Doctor Who S4. I own neither the Discworld nor Doctor Who, and this story may not be distributed on a profit-making basis.
A Busy Schedule
By Marcus L. Rowland
She looks at the body smouldering on the floor, glances at the dark figure which has suddenly appeared beside her, and says "Harriet Jones, former Prime Minister."
A hollow voice replies "YES. I KNOW WHO YOU WERE."
The Daleks leave the house. "Can't you stop them?" asks Harriet.
"I COULD," it says, "BUT THEN THEY MIGHT BE LATE FOR OUR APPOINTMENT AT…" an enormous hourglass appears in its bony hand "ELEVEN FORTY-FIVE."
"Do you have many appointments with them?" she asks hopefully.
"JUST THE ONE."
"Oh. I was hoping…"
"THERE WILL BE NO NEED FOR MORE."
Suddenly understanding, Harriet smiles.