A new set of celebrities face exciting and demanding new challenges. They've had a chance to stretch their vocal cords as they gave a rendition of a dance version of Sosban Fach at the BBC Children in Need Appeal, they've called out traditional dance steps - and sent some dancers in the wrong direction - at the Gŵyl Ifan in Cardiff and they've turned detective to find out who killed the chairman of the Gonildeb Historical Society in a murder mystery. Follow them through the ups and downs of their year long journey to get a grip on the Welsh language.

The first series of The Big Welsh Challenge saw weatherman Derek Brockway, actors Suzanne Packer and Steve Meo, musician Stuart Cable and TV presenter Sian Williams test their language face challenges like navigating a rally car, serving in a busy restaurant and performing the Welsh National Anthem. They were helped by their mentors - Sian Lloyd, Donna Edwards, Siwan Morris, Dewi Pws and Aled Jones.

Find out what Derek, Suzanne and Steve thought of the experience