TV shows Hinterland and Hidden are bilingual using Welsh and English. Caryl Lewis, who has written scripts for these TV dramas and award-winning novels, joins Catherine Fletcher for an exploration of Cymraeg, the Welsh language. We hear from Richard King, whose book Brittle with Relics is an oral history of Wales in the second half of the twentieth century, Dr Elen Ifan from Cardiff University, and composer, performer and actor Seiriol Davies, whose new musical Milky Peaks is set in the 'bosom of Snowdonia'. Caryl Lewis's many novels include Martha, Jac a Sianco and Y Gemydd and she has just published her first novel written first in English and it is called Drift.

Producer: Ruth Thomson