Terry Wogan (in-universe)

Terry Wogan, (PROSE: That Time I Nearly Destroyed the World Whilst Looking for a Dress) also known as simply Wogan, (TV: Untitled, PROSE: I Am a Dalek) was a "dreaded" individual from the planet Shepherd's Bush, (TV: Untitled) distinct for his "Irish chatter". (PROSE: I Am a Dalek)

Biography
The version of Heathcliffe Bower who didn't assassinate Margaret Thatcher occasionally appeared on Wogan. (PROSE: The Assassin's Story)

The Sixth Doctor met the dreaded Wogan. He later compared him to Roland Rat: The Series, believing the latter to be much worse. (TV: Untitled)

In April, 1999, when celebrity Polly Wright attended the funeral of Jane Vapid, she knew that everyone was hoping to be named in the television commentary by Terry Wogan. (PROSE: That Time I Nearly Destroyed the World Whilst Looking for a Dress)

In the 2000s, Kate Yates woke one morning to the news. Once that finished, Wogan's programme began, and Yates dozed off for ninety minutes, reawaking just as Wogan "hand[ed] over to Ken Bruce". (PROSE: I Am a Dalek)

Behind the scenes

 * The idea of Wogan being an undercover alien was previously used in the BBC series Not the Nine O'Clock News. In one sketch, the alien Zak (played by Rowan Atkinson) defies the Galactic Council to give Earth a series of warnings, the final one being "Beware the one who calls himself Terry Wogan. He is a Zillon from the planet Tharg, and cannot be trusted".
 * In Bang-Bang-a-Boom!, the character Logan (and the Intergalactic Song Contest) was a parody of Terry Wogan and the Eurovision Song Contest.

Information from invalid sources
On the scanner in Seventh Doctor's TARDIS, footage of Terry Wogan played. (NOTVALID: Untitled)

Dimensions in Time starred Terry Wogan. (NOTVALID: Doctor Who? 209)