The rapper held off the challenge from Calvin Harris and Example's 'We'll Be Coming Back' for a second week running.
Lawson score their highest-charting hit so far with new single 'Taking Over Me', which lands at three.
Florence + the Machine's former number one 'Spectrum' falls one to four, while Redlight enter at five with 'Lost In Your Love'.
Maroon 5 fall two to six with 'Payphone', with Rudimental scoring an 11th week inside the Top 10 at seven with 'Feel the Love'.
Nicki Minaj climbs up three places to eight with 'Pound the Alarm', while Stooshe and Karmin each fall four with 'Black Heart' and 'Brokenhearted' to complete the Top 10.
Dizzee Rascal's latest single 'Scream' featuring Pepper is a new entry at 22, while his former number one 'Bonkers' re-enters at 31 after he performed it at the London Olympics opening ceremony on July 27.
Alex Clare climbs back up 11 places to 24 with long-runner 'Too Close', while Justin Bieber re-enters at 25 with 'As Long As You Love Me'.
Of Monsters and Men achieve a new peak with single 'Little Talks', which enters the Top 40 at 28, and Cheryl Cole lands at 36 with her latest single 'Under the Sun'.
Watch the video for Wiley's 'Heatwave' below:
Source: Official Charts Company
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