The Royal Albert Hall, as Douglas Adams never wrote, is big. Really big. You just won’t believe how vastly, hugely, mind-bogglingly big it is. Which is great if you want a colossal audience; less great as a venue for classical music. True, sound engineers have brought us a long way from the 19th century, when one critic (it might have been Bernard Shaw) described a Weber overture wafting around that cavernous acoustic like a feather caught in a draught.