I had a meeting in Knightsbridge first thing this morning which I walked to across Green Park.   It’s an oddly indeterminate shape, an empty bit of grass and trees alongside the rushing hoardes down Constitution Hill.   I was surprised by a) how empty it was b) how attractive it is that it leads from nowhere to nowhere and c) how spacious it can feel with trees and what is nearly a field, so that you can lose any sense of London fragmentarily:-