33 Numerous people were speculated to host the series, including High School Musical star Corbin Bleu, model Marisa Miller, 34 and Dermot O'Leary, host of the UK version. Geri Halliwell served as guest judge at the Glasgow auditions; Natalie Imbruglia at the Birmingham auditions; Katy Perry at the Dublin auditions; Pixie Lott at the Cardiff auditions; and Nicole Scherzinger at the Manchester auditions and bootcamp. Bootcamp was cut entirely in series 15 due to timing constraints and instead the judges reviewed the audition tapes and decided who to send through to the next stage of the competition. 132 In series 5,.8 million tuned in to see show of 29 November 2008 featuring guest Britney Spears, a new X Factor record. Judges' houses returned to its previous format in being entirely pre-recorded at the locations for series. Retrieved January 15, 2010. Reid, with Nicole Scherzinger and Steve Jones as co-hosts. "What happens at an X Factor audition?". Reisaelva sone 3 og 4 sone 4 sone 5 sone 2 sone 3 sone 3 sone. A b "Joe McElderry's 'X Factor' win draws.7m". In series 45, the minimum age was lowered to 14, creating a 1424 age group.