Kirsty Williams, Leader of the Welsh Liberal Democrats, is calling on the Welsh Government to conduct a national audit of asbestos in schools following the closure of a school in Caerphilly. Cwmcarn High School, which has more than 900 pupils, shut late last Friday after a structural report identified asbestos. Many school buildings in Wales were built between the 1940s and 1980s, when asbestos was used extensively