According to press materials, Gaumond "leaves the show to focus on his recording career." Sullivan, who will appear in the show through late October, has previously appeared onstage in Fame, Grease, Love Shack, Flashdance and Simply Ballroom, as well as in concert performances including the Royal Gala opening of the Millennium Centre in Wales.
Sullivan joins a company that currently includes Lauren Samuels as Scaramouche, Brenda Edwards as Killer Queen, Kevin Kennedy as Pop, Rachel John as Meat, Alasdair Harvey as Khashoggi and Wayne Robinson as Britney.
To book tickets, contact the box office on 0870 169 0116, or visit www.wewillrockyou.co.uk for more details.