Delius and Puccini: how’s that for an operatic odd couple? Delius, that most faded of British masters, now remembered largely as a purveyor of wistful aquarelles. And…well, and Puccini. Early, neglected Puccini, true, but this is Opera Holland Park, where they make it their mission to rescue the waifs and strays of Italian late romanticism, and see how they scrub up.