Gregory Porter, The Vamps, Rick Astley and more will also perform at London show
However, Jason Orange is unlikely to be involved in any of the group's anniversary plans
He previously surprised a couple at their wedding
The ‘Angels’ singer is reported to be working with them for the 25th anniversary
Band are currently performing as a trio following departures of Robbie Williams and Jason Orange
Hyde Park has played host to the likes of Taylor Swift, Blur, The Strokes and more in recent years
Take That singer previously promised to sing at three fan weddings during 2015