Roll up, roll up, it's Katie Mitchell and her one-size-fits-all production concept, or as ENO generously put it, "unique directorial style". The victim this time round is Idomeneo. Perhaps people are wising up - at any rate, ticket sales are slow, so a number of deals are available.
All are offering best available dress circle tickets for £20 and upper circle for £10 (plus booking fee) on 18, 23, 25 and 30 June and 2, 6 and 9 July.
1 - via www.eno.org, using the code "IDOMMETRO" .
2 - via Ticketmaster using the code "TMDEAL" in the "Ticketdeals Partner Offer" box.
3 - via SeeTickets, no code required. The seats allocated to Ticketmaster and See Tickets may be better than those remaining on ENO's own site, so I would check all before finalising a booking. (thanks Faye and Ruth for tips)

