The Talons of Weng-Chiang - S14-E6
Trivia: A pile of straw - seen in the road as Weng-Chiang searches for the time cabinet - was placed there to hide a modern (1970s) car which had, despite requests to the contrary, been parked in the road prior to filming, and whose owner refused to move it.
Answer: It was never destroyed on-screen; it was intact at the end of the TV movie, and destroyed by the start of the 2005 series. It was destroyed in the novel "The Ancestor Cell," but in a completely different manner to what happened in the series.
DaveJB