The Happy hitmaker has teamed up with U.K. TV series Good Morning Britain to offer a special award to the winner of the WellChild charity's Young Hero Award, which is given to a youth "who has helped another child with a health issue, illness, disability or other condition".

The winner, aged between six and 16, will be selected from a list of nominations sent into the show by adults, and will be brought on stage during Williams' set at the British music festival as he performs Happy on 13 June (15).

In a video, Williams says, "When I heard that Good Morning Britain was looking for a new young hero, I kinda wanted to be a part of it, so I've arranged for a little extra prize. It's a VIP trip for the winning inspirational child and three of his guests or her guests. You guys will be flown by helicopter to the Isle of Wight festival and that's where you'll join me on stage, we'll have fun so if you guys know anybody, or any amazing child out there, that helps others, cos it's about the amazing children that do this, then start nominating now. I'll see you guys soon."

The winner will then collect their Young Hero accolade at the 2015 WellChild Awards in the autumn (15).

The festival runs from 11-14 June (15) and headliners include Fleetwood MAC, Blur and The Prodigy.