The Calvin Harris collaboration is number one for a third week running, holding off Maroon 5's 'Payphone', which is a non-mover at two.
Stooshe climb two places to three with 'Black Heart', while Conor Maynard has this week's highest new entry with 'Vegas Girl' at four. Flo Rida completes the top five with 'Whistle'.
US duo Karmin score a Top 10 hit with their debut UK single, with 'Brokenhearted' landing at six.
Rudimental are a non-mover at seven, spending their ninth week inside the Top 10 with 'Feel the Love'.
Chris Brown falls three to eight with 'Don't Wake Me Up', will.i.am drops five to nine with 'This Is Love', and fun. climb back up two spots to ten with 'We Are Young'.
Far East Movement and Cover Drive climb 12 places to 16 with 'Turn Up the Love', with Cedric Gervais entering at 26 with dance track 'Molly'.
Public Enemy enter the Top 40 with classic track 'Harder Than You Think' at 27, after it was used in Channel 4's advert for the Paralympic Games.
Madeon has a new entry at 35 with 'Finale', with Clement Marfo & The Frontline landing at 38 with 'Champion'.
Watch the video for 'Spectrum' by Florence + the Machine below:
Source: Official Charts Company
> This week's albums chart