All performances (1 to 5 April) are included in the offer.
Prices are £30 (regular price £50) for Upper Circle and £46 (regular price £78) for Stalls or Dress Circle. You don't get to choose your seat, but you will be shown exactly which seat number you have been allocated before you pay. Seats are selected from a special allocation, not from those showing as unsold on the ENO website.
After paying you will receive an e-ticket voucher, so you will need either a printer or a mobile device to take this to the theatre.