Let me tell you about the very rich. They are different from you and me, though if you’ve spent much time in the world of classical music, and you hadn’t realised just how different, you could do worse than attend an opening night at Grange Park Opera. True, Grange Park’s founder, Wasfi Kani, is famously adept at cultivating donors: you don’t build an opera house on the late Duchess of Roxburghe’s Surrey estate without a certain fundraising flair.