The Arctic Monkeys have swung back into U.K. record stores in style with exceptional opening sales for their second album, "Favourite Worst Nightmare." The hugely anticipated set shifted almost 85,000 units on its first day of release yesterday (April 23), according to over-the-counter sales data collated by the Official U.K. Charts Company.

The record is "easily the fastest-selling album of the year to date," comfortably outselling the Kaiser Chiefs' 'Yours Truly, Angry Mob' (B Unique/Polydor), which shifted 151,000 during its debut week in March, explains Melanie Armstrong, music manager at Britain's market-leading specialist music and entertainment retailer HMV.

If sales continue at this pace, she notes, the Monkeys' first-week sales "should certainly top the quarter million mark. This would not only give the band a sure-fire No. 1, but already leave [it] well-placed to have the biggest album of 2007."

Few newcomers in recent years have commanded as much U.K. media attention and sales success as the Sheffield, England, foursome, whose record-busting debut "Whatever People Say I Am That's What I'm Not " cleaned up the charts, and later at numerous awards ceremonies.

The January 2006 debut "Whatever People Say I Am, That's What I'm Not" was a sales phenomenon, shifting 363,735 copies in its week of release in Britain, including 108,000 on the first day alone.

"It was always going to be next to impossible beating the phenomenal day and week one sales of [the debut], which proved to be one of the media stories of 2006, but coming this close is a fantastic result which underlines the band's status as the U.K.'s number one rock act," says Armstrong. "People are buying this album not because of any media hype, but because it's had great reviews, and they can't wait to hear it."

In support of the album, the Arctic Monkeys will embark on an international tour, beginning this Friday at the Coachella Valley Music and Arts Festival. Some of the world's biggest festivals are on the band's itinerary, including England's Glastonbury, Germany's Rock am Ring, Scotland's T In the Park, and Denmark's Roskilde.

"Our thing is to play good gigs this year," frontman Alex Turner tells Billboard.com. "We just want to play good shows, [and] to do them in the best way that we can. We're only doing a few big shows, but we don't want to do them in a normal, boring way. And we want to have a laugh and have fun this year."