Contestants that make it into the semi-finals by making it through the auditions and being chosen by the judges (or, from series 8, received the Golden Buzzer during their audition), perform once more before an audience and the judges, with their performance broadcast on live television. Until the tenth series, live episodes were broadcast from The Fountain Studios in Wembley, the same site used for The X Factor, but following its closure in 2016, the show relocated its live episodes to Elstree Studios in 2017, before moving to Hammersmith Apollo the following year. Like the Audition stage of the contest, each semi-finalist must attempt to impress by primarily conducting a new routine of their act within the same span of time; the judges can still use a buzzer if they are displeased with a performance and can end it early if all the buzzers are used, along with giving a personal opinion about an act when the performance is over. Of the semi-finalists that take part, only two can progress into the final, which is determined by two different types of votes - a public phone vote, and a judges ' vote.
where is britain's got talent semi finals filmed
Hammersmith Apollo