Overnight, mountains of plane tree leaves have amassed on sidewalks, against walls and fences. Leaves paper walls, cars and bike sheds. While Storm Bert has resulted in mass-rearrangements of leaves in London, elsewhere in the UK roads have been flooded, and thousands of people were without power. Although relatively minor compared to these other events, the leaf-mountains feel oddly dramatic in today's calm, blue sky weather. Photographs don't do them justice- they are space-invaders, yellow-brown fillers of unused corners and parking spaces, where the westerly wind carried and dropped them.