Undeb Cenedlaethol Athrawon Cymru (Welsh, the sole official name, meaning 'National Union of Teachers of Wales') commonly referred to as UCAC, was formed in Wales from a split from the NUT in the late 1940s over the issue of the Welsh language in teaching. It has around 4,000 members, who are nearly all Welsh speakers, representing mainly teachers in Welsh medium schools or teachers of Welsh in English medium schools. It accounts for about 15% of the total teacher workforce in Wales. It is affiliated to the UK Trades Union Congress (since 1994), since under current TUC rules it is not permissible to affiliate only to TUC Cymru. Its main office is in Aberystwyth, Ceredigion. As well as representing its members at all levels it also campaigns for an independent education system for Wales. References External links Official website Education in Wales Education trade unions Trade unions established in 1940 Trade unions in Wales Organisations based in Aberystwyth Trade unions affiliated with the Trades Union Congress