Katy Perry scored her first U.K. No. 1 album with "Teenage Dream" (Virgin/EMI), but the title track single had to be content with a No. 2 debut behind former "X Factor" contestant Olly Murs' "Please Don't Let Me Go" (Epic/Syco Music/Sony Music Entertainment).

Perry's debut album "One of the Boys" debuted and peaked at No. 11 in the U.K. in October, 2008. The follow-up repeated its feat on the current Billboard 200 to arrive at the top, nudging Eminem's "Recovery" (Interscope/Universal) down to No. 2. In the U.K. "Teenage Dream" has first week sales of 54,000 according to the Official Charts Co.

Scottish rock trio Biffy Clyro's "Only Revolutions" (14th Floor/Warner Music), released last November when it debuted at No. 8, rebounded 27-3 on the new U.K. Official Charts Co listing last night (Sept. 5). The album is nominated for the Barclaycard Mercury Prize, the winner of which is announced at a London ceremony tomorrow (Sept. 8).

Another long runner climbing again on the chart was Mumford and Sons' "Sigh No More" (Universal Island), up 7-4. That's a new peak in its 48th chart week for the album, which debuted last October and has been dipping in and out of the top 10 since January. Two more titles opened in the new top ten, with the debut set "Light Me Up" (Interscope/Universal) by New York rockers the Pretty Reckless new at No. 6 and "Asylum" (Reprise/Warner Music) by Chicago hard rock act Disturbed at No. 7.

U.S. acoustic rock singer Lissie had a breakthrough week, climbing 42-12 with the debut album "Catching A Tiger" (Columbia/Sony Music Entertainment); much-touted new British modern rock group Everything Everything started at No. 17 with their "Man Alive" debut for Geffen/Universal; and veteran folk-rock artist Richard Thompson debuted at No. 20 with "Dream Attic" (Proper). It's Thompson's highest-ever U.K. album ranking after 25 years of charting solo albums.

Murs finished second behind Joe McElderry in last year's sixth series of "The X Factor" and was signed by Epic/Syco in February. "Please Don't Let Me Go" is the debut single from his first album, due in November. With Perry new at No. 2, the one other new top ten singles debutant was "You Took My Heart" (Must Be The Music) by Pepper & Piano, at No. 7. The duo of vocalist Katie Pepper and pianist Emma Alkazraji are contestants in the current Sky talent show series "Must Be The Music," judges on which include artists Jamie Cullum and Sharleen Spiteri.

On Billboard's pan-European sales charts, Iron Maiden's "The Final Frontier" (EMI) is in a second week atop European Albums, as the No. 1 berth on European Hot 100 Singles is occupied for a sixth straight week by "Waka Waka (This Time For Africa)" (Epic/Sony Music Entertainment) by Shakira featuring Freshlyground.