The Greatest Show in the Galaxy - S25-E4
Trivia: For a show with a "Circus and Clowns" theme, it is appropriate that this Doctor Who story was filmed in a tent. It wasn't planned that way, but the studio at BBC TV Centre in London that was originally to be used for filming "The Greatest Show in the Galaxy" had to be closed at short notice when the presence of dangerous white asbestos was discovered in the studio's structure. With no alternative studios available, filming was switched to a marquee temporarily erected in the car park of the BBC Studios at Elstree.
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