Gerald Barry has written six operas, with his first The Intelligence Park of 1990 appearing in the Royal Opera House’s Linbury Studio last autumn. Now, his Alice’s Adventures Under Ground of 2016 comes to Covent Garden’s larger venue for its first ever staged performances. The opera only lasts an hour meaning there are two performances on most of the days it is appearing, with Cast A taking on one of them and Cast B the other. Barry has opted for the original title of...