Grant, best known as a TV astrologer and entrant to TV's "Strictly Come Dancing," recently appeared in the title role of The Wizard of Oz at the London Palladium. He will appear in tour dates at Newcastle (July 9-14), Llandudno, Dartford, Southsea, Manchester, Wimbledon and Swansea. Byrne, a 2010 finalist on TV's "The X Factor," will star in Newcastle (July 3-7) and Eastbourne. Her debut album "Mine and Yours" held the number one spot for two weeks in March 2011. Her follow-up album "...with Love" also charted in the Top 10. She has previously played Teen Angel in the show's run at Dublin's Grand Canal Theatre in August 2011.

Roberts, a classically trained Welsh singer who was a finalist on "The X Factor" in 2007, will star in Southend and Bournemouth. He signed a record deal with Sony BMG, focusing on classical crossover material with his debut album "Rhydian" in 2008 and "O" in 2009. He has performed at arenas and concert venues around the country with artists that include The Stereophonics, Celine Dion, Michael Bublé, Bryn Terfel and Dame Kiri Te Kanawa and at major events including Andrew Lloyd Webber’s 60th Birthday Party in Hyde Park (2008) and the opening ceremony for the Ryder Cup (2010). He appeared in the 2010 European tour of The War of the Worlds and as Khashoggi in the UK tour of We Will Rock You.

For full tour dates and to book tickets, visit www.greasethemusical.co.uk.