Ariana Grande

Ariana Grande performs onstage during 103.5 KTU's KTUphoria 2014 presented by Burlington, at IZOD Center on June 29, 2014 in East Rutherford, New Jersey.

Mike Coppola/Getty Images for Clear Channel Media and Entertainment New York

In a historic week for the U.K. charts, "Problem" (Republic/Universal) by Ariana Grande featuring Iggy Azalea debuted at the top to become the country's first No. 1 single based on both sales and streams — although it would have been the chart-topper on sales alone. Meanwhile, Ed Sheeran's "x" (Asylum/Warner Music) started a second week atop the album chart, as all 12 of the tracks on the regular release simultaneously appear in the top 100 of the singles chart.

The Official Charts Company reports that with 100 streams counting as one sale in the new computation system, the average streaming contribution in the first combined chart stood at just over 20%. Grande's single, her first No. 1 in the territory and the 1,267th in U.K. chart history, had an aggregate total of 113,000, of which the streaming factor was 6%. That was drawn from 712,000 audio streams of "Problem" across the week, which now represents 7,120 sales.

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Ella Henderson's "Ghost" (Syco Music/Sony) held at No. 2 after two weeks at the summit, the OCC reporting that it was streamed over one million times in the chart week to Saturday at midnight. With many performers at the previous weekend's Glastonbury Festival enjoying the traditional chart bounce, 21-year-old British singer-songwriter George Ezra's "Budapest" (Columbia/Sony) climbed 5-3, while his debut album "Wanted On Voyage" debuted at No. 3. Sheeran's "Sing" track dipped 3-4.

Last week's No. 1 single, "Gecko (Overdrive)" (ffrr/Musical Freedom/Universal) by Oliver Heldens featuring English singer Becky Hill, fell to No. 5. Australian "non-star" Sia, a chart regular in recent years as guest vocalist with David Guetta and others, achieved her highest-ever solo ranking in the U.K. as "Chandelier" (Monkey Puzzle/RCA/Sony) debuted at No. 6. It's her first top ten showing in her own right here since "Taken For Granted" reached No. 10 in 2000.

Also new in the singles top ten was British dance producer DJ Fresh, landing his sixth top tenner with "Make U Bounce" (Ministry of Sound), billed as DJ Fresh Vs TC featuring Little Nikki. 

The complexion of the first "sales + streams" chart will not have seemed spectacularly different to the naked eye, even to keen chart watchers, but a look at the OCC's sales-only list shows some interesting nuances. Heldens & Hill are at No. 4 in that chart, staying ahead of streaming favorite Sheeran, while the DJ Fresh track loses out in the combined chart, standing at No. 7 in sales alone as opposed to No. 10 combined.

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In the streaming-free album chart, meanwhile, Sheeran's "X" recorded second-week sales of 93,000 to take its two-week tally to 275,000 and place it fourth already in 2014 artist album sales. He's perhaps the most visible beneficiary of the singles chart's new streaming factor, with four of its tracks inside the singles top 40. The eight others from the regular edition of the album are all inside the top 100, along with two more from the physical deluxe edition and one more from the digital deluxe edition.

Australian quartet 5 Seconds Of Summer landed the week's highest new entry with their self-titled debut album for Capitol/Universal in at No. 2 on sales of nearly 67,000. With Ezra up to No. 3, Dolly Parton's "Blue Smoke – The Best Of" (Sony Masterworks) was boosted by her hugely-publicized Glastonbury performance with a 7-4 climb, while Sony's "Very Best Of" set of 2007 raced 137-41. Three of her classic singles also reappeared in the top 100, "Jolene" climbing 156-52, "9 To 5" 193-75 and "Islands In The Stream," with Kenny Rogers, 178-89.

Durable British singer-songwriter David Gray's "Mutineers" album (IHT) came in at No. 10 to become his sixth U.K. top ten album and improve on the No. 18 peak of 2010's "Foundling." British folk collective Bellowhead marked their tenth anniversary, and their signing with Universal Island, by debuting at a career-best No. 12 with "Revival." "Now That's What I Call Summer" (Sony Music CG/Virgin EMI/Universal) started a second week atop the compilation chart.