Access all Arias – English National Opera
Following in the footsteps of The National Theatre, The ENO runs Access All Arias – a scheme offering 16- to 25-year-olds the chance to experience some of the world greatest opera and ballet for little more than £20, plus you can bring a friend for the same price. If you think this still seems a little steep, just remember the tickets normally cost around £100!
The English National Opera’s in-house productions at the London Coliseum range from new commissioned work to revivals of brilliant classics. Similar to the Entry Pass at the NT, the key is to book early.
http://www.eno.org/explore/access-all-arias/access-all-arias.php