Doctor Who: 14 Cool Details Revealed In David Tennant's The End Of Time Part One Commentary
2. ...And This Basement Was Used In New Earth
Another repeat location, this one is actually quite poetic, because it ties back to the very first episode of Tennant's first full series as the Doctor.
That episode - New Earth - sees skinny villain Lady Cassandra hanging out in a dinghy basement with her servant, Chip, and if this basement looks familiar... that's probably because you've seen it in Doctor Who more than once.
It's the same basement that we see in The End Of Time, during the scene where the Doctor and Wilf talk to the Vinvocci.
And once again... this is another area located inside Tredegar House.