Songwriter Ed Drewett reckons One Direction's new single could top The Wanted's 'Glad You Came' as his most profitable song.

The British music man has penned a number of massive tracks and he recently had a go at One Direction's latest release 'Best Song Ever'.

It is on course to top charts all across the world and speaking to the Metro, Drewett revealed that it will probably eclipse a Wanted track he wrote in terms of financial success. Speaking about 'Glad You Came' - which the songwriter said has made him the most cash - he said:

"I've only seen the first couple of payments but I'm pretty happy with it. 'Best Song Ever' for One Direction may top that. That's a serious cut - I'm ecstatic about that."

Drewett added: "For any artist you write for, you have to tailor-make the song. So it might be something a bit younger and cheekier for One Direction. With Olly Murs it was a little bit more mature. You have to be aware of what you're writing but melodies just come out, and if they're good, they're good."