Who is returned as a lead vocalist on the song Happy Now on Take That's album Progress? 
Happy Now (Take That song): "Happy Now" is a song by British pop group Take That from their sixth studio album, "Progress". Happy Now (Take That song):  The song features Gary Barlow and Robbie Williams performing lead vocals. Progress (Take That album):  It is the band's first and only album to feature the return of Robbie Williams since his initial departure from the band in 1995, and the final album to feature Jason Orange due to his departure from the band in 2014.
Robbie Williams