The One Show presenter Roman Kemp has announced he's joining the cast of BBC series Celebrity Race Across The World with his sister Harley Moon and three other famous duos Celebrity Race Across The World has confirmed its full line-up, with radio and TV presenter Roman Kemp joining former Strictly Come Dancing stars Tyler West and Molly Rainford. After an announcement on The One Show, the four celebrity duos have been confirmed with Tyler and Molly, who recently celebrated their engagement, up against Roman and his sister Harley Moon. They’ll be competing against Derry Girls actor Dylan Llewellyn and his…