Instructions:Grab £15 tickets to see the English National Opera's Faust at the London Coliseum, worth £34 - £59, subject to availability.
Offer tickets are only for upper circle seats and only on the following Saturdays: Sept 18th and 25th, Oct 2nd, 9th and 16th.
To get the £15 tickets, simply pick which Faust performance you wish to attend and enter the code MSEFAUST in the discount box found at the top of the seat selection page.
There's a £1.50 booking fee per transaction, so if you want multiple seats it's cheaper to get them in one booking. The code can't be used with other offers.
Thanks to Martins tip from mse