15 episodesFirst aired 10 January 2015
E1Jan 2015
The singing contest returns for a fourth series as Rita Ora joins the panel.
E2Jan 2015
The coaches assess the vocal talents of another ten hopefuls.
E3Jan 2015
To Sir Tom's delight, this edition sees many Welsh faces behind the spinning chairs.
E4Jan 2015
The blind auditions continue with surprises including trumpet-playing Dawn.
E5Feb 2015
The blind auditions continue and include a celebrity chauffeur booker and an Essex rapper.
E6Feb 2015
The judges hear from Beckenham duo the Rise, poet Lara Lee and Damian Dalton Smith.
E7Feb 2015
The blind auditions come to an end as the coaches complete their teams.
E8Feb 2015
Emma and Marvin present as the coaches pair up their acts to battle it out against each other in head-to-head musical performances.
E9Mar 2015
In a nail-biting final battle, the remaining artists of each team take to the stage.
E10Mar 2015
The coaches must choose the best three acts from their team to continue to the live shows.
E11Mar 2015
The coaches must choose the best three acts from their team to continue to the live shows.
E12Mar 2015
Featuring live performances from Olly Murs and 2014's winner Jermain Jackman.
E13Mar 2015
Emma Willis and Marvin Humes reveal the results of the public vote.
Mar 2015
The semi-final sees the coaches' remaining eight acts perform live in front of the nation.
Apr 2015
The final four artists face the public vote in a bid to be crowned the winner.