When I saw the first performance of this production of Ravel’s two operas at Glyndebourne three years ago, I thought it was the nearest thing to operatic perfection I had witnessed. But this revival is even finer. Whereas I concluded last time that L’heure espagnole was fundamentally an old-time bore that goes on for far too long — only 50 minutes, but it seemed much longer — this time I found it absorbing from start to finish, though I still think it is no funnier than most of what used to be called dirty jokes.