Bruce Forsyth (in-universe)

Sir Bruce Forsyth was an accomplished British actor and television presenter during the 20th, 21st, 22nd, and 52nd centuries.

Biography
Bruce was a well known celebrity by at least the 1960s. (AUDIO: )

Forsyth's life and career continued right across the 21st century and into the start of the 22nd. The Eleventh Doctor accidentally brought Dermot O'Leary to the year 2111, where O'Leary was amazed to find Forsyth still alive and working at the BBC while not looking any older. (TV: )

By the 52nd century, (TV: ) Dorium Maldovar could not resist "a bit of Brucie" upon mentioning he watched Strictly, implying he was still performing. (PROSE: )

Information from invalid sources
Forsyth danced with Michael McIntyre while singing alongside other guests at a Christmas party. (TV: Consider Yourself One Of Us...)

Other matters
Dermot and the Doctor's claim that Forsyth was still alive and working by 2111 is a reference to the star's longevity. Of course, inevitably, Forsyth passed away in 2017. Forsyth's life in the 22nd century has never been contradicted in any other source.

Dorium Maldovar Tells It Like It Is! does not make it clear whether the 52nd century-hailing Dorium is simply watching past episodes of Strictly, or if the story is taking the joke about Forsyth's longevity to an even greater extreme.