 For most of its existence the company lacked a permanent base in Cardiff , but in 2004 it moved into the new Wales Millennium Centre , Cardiff Bay . The company tours nationally and internationally , giving more than 120 performances annually , with a repertoire of eight operas each year , to a combined audience of more than 150 @,@ 000 people . Its most frequent venues other than Cardiff are <unk> in Wales and Bristol , Birmingham , Liverpool , Milton Keynes , Oxford , Plymouth , and Southampton in England . 
