 In 1973 Geliot 's WNO staging of <unk> 's Billy <unk> with Allen in the title role was presented on a Swiss tour , and two years later it was given in Barcelona . The company returned to London with its participation in the <unk> Festival of Opera at the Dominion Theatre in 1979 , presenting The Makropoulos Case , The Magic <unk> , <unk> , Madame Butterfly , and Tristan and Isolde to capacity audiences . 
