It was as if she was a dream, like London, which he could not entirely grasp and of which he was not worthy. He wanted to be part of it but had forgotten how. It seemed extraordinary and strange that this paragon among women had condescended to travel on his ship. In fact, she’d insisted upon it. Her presence was at once otherworldly and familiar, none of which explained why his brain ceased to function when he was in her company.

The old London was fading from her memory. She no longer expected to see the shops that had been bombed when she passed familiar streets. In many places the sites were being redeveloped. That’s what seemed real now – the new buildings and the flats above them. As she hit her stride, Mirabelle smiled. It felt good to be in the big city again and on her way.

A vision of the little house in Soho flickered across his mind’s eye, his mother at a desk, writing in her journal, with hazy sunlight streaming through the morning windows. The woman inhabited a world he had once thought his own – a world of publishers and reliable suppliers. A London that was confident and competent amid its grey, puddle-strewn streets.

When you're depressed you retreat and you go into a smaller world. This is why Brighton worked well for the story, because it's a smaller world than London.