As Glyndebourne celebrates its 90th anniversary, the gardens at the opera house are still hitting all the high notes.
It is 90 years since John Christie and his wife, the soprano Audrey Mildmay, put on their first opera at their home, Glyndebourne, near Lewes in East Sussex. Although the idea has been taken up by other country houses since, nowhere else is set in such an unforgettable landscape, nor has an opera house of such quality.
Since 1934, Glyndebourne has…