Pharrell Williams is spending his third non-consecutive week at No. 1 with his single ‘Happy’.

The Oscar-nominated track keeps going from strength to strength as the past seven days have seen the biggest week of sales yet for the 'Depicable Me 2' number.

118,000 copies of ‘Happy’ have been purchased this week alone and has now sold over half a million units in total.

A further trio of non-movers in the top five come from Pitbull and Ke$ha at No. 2 with ‘Timber’, Avicii’s ‘Hey Brother’ at No. 3 and Jason Derulo’s ‘Trumpets’ at No. 4.

The top five is completed by a new entry from Elyar Fox with ‘Do It All Over Again’ debuting at No. 5.

Another new entry to this week’s chart comes from a superstar duo. ‘Can’t Remember To Forget You’ by Shakira and Rihanna has charted at No. 11.

High climbers in the chart this week come in the form of ‘Lover Not A Fighter’ by Tinie Tempah and Labrinth which has moved up 15 places to No. 27. Beyoncé’s ‘XO’ has also ascended the chart by advancing 8 positions to reach No. 37.  

Watch the video for 'Happy' below: