He is a member of the Royal Shakespeare Company and later joined the Renaissance Theatre Company. He has appeared in many of Kenneth Branagh's films, most recently as Corin in the 2006 film "As You Like It". Yuill was also the music composer for "A Midwinter's Tale" and "Swan Song".
"A Midwinter's Tale" was not created by Branagh.
Yuill was the composer of the song A Midwinter's Tale, so it could not have been Branagh. I believe the system found it hard to determine because Branagh was part of the text as having films that Yuill starred in and also listed the music Yuill created, which made the system thing the title of the songs were title's of Branagh's films.