For He's a Jolly Good Fellow

Members of UNIT sang "For He's a Jolly Good Fellow", led by John Benton, to congratulate Clifford Jones and Jo Grant on their wedding engagement. They quickly changed their wording to "for they are folly good fellows", singing an alternate rendition:
 * For he's a jolly good fellow, for they are jolly good fellows
 * For they are jolly good fellows, and so say all of us. (TV: The Green Death)

Darius Pike, with a birthday cake in hand, sang the song as he celebrated the 38th birthday of Alistair Gryffen in 2050. He stopped as he found and greeted Taphony: "For he's a jolly good fe... 'ello?" (TV: Taphony and the Time Loop)

The Eleventh Doctor later gave an impromptu and slightly inaccurate rendition of "For He's a Jolly Good Fellow" on Christmas Eve outside Maisie Johnson's house. (PROSE: The Gift)