I love a big city get away. The energy, architecture, great food, art galleries, the zingy mix of languages, the cultural melting pot. But there are down sides: the crowds, high prices, and the sharp, sharp contrast between those who have and those who haven’t a roof over their heads. On a recent trip to Sydney, I was reminded of living in London years ago. I became desensitised to the homeless dotting the pavement because they were just part of my daily landscape. But that was before…