auditions, in which the YouTube community voted on their favourites between 6 and 13 February, with the winning acts later performing before the judges after the results of the vote on 18 February. Between 25 and 31 January, the sponsors of the show for this series, Virgin Media, ran addition auditions for the show via videos made on YouTube and/or Vimeo, which, while adhering to the same rules, were restricted to only Virgin Media customer, with the five winning acts later performing for the judges during the Birmingham auditions. Following the previous series, both David Hasselhoff and Michael McIntyre announced that they wouldn't be returning for another year of the competition. Their decision led to the producers seeking out their replacements, after deciding to maintain the use of four judges in the programme following Cowell's announcement in December 2011 that he would be returning to oversee auditions for the sixth series. Both Hasselhoff and McIntyre were eventually replaced by comedian David Walliams, and singer and TV presenter Alesha Dixon, the latter having previously been a judge on BBC's Strictly Come Dancing. Owing to her pregnancy entering its late stages, Holden was forced to be absent from the Blackpool auditions. As a result, the production team brought in Carmen Electra as a guest judge and oversee these in her place, until Holden was cleared by doctors to return to overseeing the remainder of the auditions. Apart from a change in the judging panel, the producers decided to increase the prize money offered to the winner of the series to £500,000, with Cowell pledging half of the prize money being offered to the winner. Of the participants that took part, only forty five made it past this stage and into the five live semi-finals, with nine appearing in each one; this was a significant change after the last four series of the programme. In a change with the format, the live final featured ten acts that made it through the semi-finals, and one additional act dubbed "the Judges' wildcard" - if a semi-finalist was eliminated in their semi-final, they became eligible to be picked as a wildcard act for the final by the judges, with the choice made prior to the live final's broadcast. The wildcard for this series was boyband The Mend, after they lost out in the tied Judges' vote in the first semi-final. The following below lists the results