Useless Things (short story)

Summary
Alien invaders led by Prince Genei plan to take over the world, but are scared off by a police box they believe to be the Doctor's TARDIS. However, the police box is actually the last of its kind in England, and workmen arrive to remove it shortly after the invaders depart for their own world.

Characters

 * Prince Genei

Continuity

 * Workmen arrive to remove the police box shortly after the invaders leave, so the story has to take place at some point after TV: Logopolis.