The Welsh Ambulance Service NHS Trust ( Welsh : Ymddiriedolaeth GIG Gwasanaethau Ambiwlans Cymru ) was set up on April 1 , 1998 and has 2,500 staff providing ambulance and related services to the 2.9 million residents of Wales . The Welsh Ambulance Service NHS Trust ( also called Ymddiriedolaeth GIG Gwasanaethau Ambiwlans Cymru ) was established on 1 April 1998 , and has 2,500 staff providing ambulance and related services to the 2.9 million residents of Wales .