During Lockdown 1.0, I spent as much time as I could outdoors. Like many, I found it gave me an opportunity to appreciate nature on my doorstep even more than usual. Combined with a beautiful spring and the dramatic reduction in pollution, it seemed especially piquant. My lockdown urban nature explorations turned into a project which came to fruition in October with the publication of my new book, London Tree Walks: Arboreal Ambles Through the Green Metropolis.