May I thank What's on Stage for the Promotion they have acquired on Boris Godunov at ENO?

If you have an account with ENO (possibly also if you don't have one) all you need do is select £76 seats, input the Promotion Code and you get your selection- priced at £25. ENO allows you to choose seats online. It doesn't work with £84 seats on selected nights but that isn't much of a hardship.

It worked for me anyway.