David Guetta's Titanium hits No 1
David Guetta hit the top of the singles charts with his track Titanium, featuring Australian singer Sia.
The French producer and DJ moved up one place, replacing Twilight by Cover Drive, which dropped to number six.
Alone Again by 18-year-old Canadian Alyssa Reid, featuring Jump Smokers, entered the listings from the Official Charts Company at number two.
Somebody That I Used To Know by Belgian-Australian musician and singer-songwriter Gotye, featuring Kimbra, rose from number seven to number three.
Former number one Domino, by Jessie J, dropped a place to number four, while Wild Ones by Flo Rida featuring Sia remained at number five.
In the album chart US singer-songwriter Lana Del Rey came straight in at number one with Born To Die, while Canadian veteran Leonard Cohen followed her into the chart a place behind with Old Ideas.
Ed Sheeran dropped two places from number one with his acclaimed debut album +, while Adele slipped to number four with 21.
Coldplay's Mylo Xyloto dropped from two to five.