I keep forgetting to include Music OMH in my regular reads. It has a London Classical and Opera Preview for March and April
Of those listed, I have tickets for Eugene Onegin, Gotterdammerung and the Beethoven 9th - and I must absolutely concur with the comment there!
The article serves as a timely reminder to get a few ENO events booked as well as the Handel and Rossini (possibly - I'm not a huge Rossini fan) at the Barbican.