See You Again, Khalifa's second U.K. number one, has become the fastest-selling single of the year (15), beating Omi's Cheerleader to number one.

Rounding out the top five is Jess Glynne's Hold My Hand, Dr Kucho, Gregor Salto and Ane Brun's Can't Stop Playing and Years & Years' King.

Meanwhile, on the album charts, Paul Simon has scored his first number one album in 25 years with his latest greatest hits record, The Ultimate Collection.

James Bay's Chaos And The Calm and Ed Sheeran's X take the second and third spots, respectively, while Sam Smith's In the Lonely Hour and Wombats' Glitterbug close out the new top five.