London is a green city. Miraculously green. For every building, street and pavement, for every concrete block and brick wall, there’s about as much green space, garden, park and field. Should 8.4 million Londoners spontaneously decide to hug a tree, there’d be a tree each for them to do so. Walk the city and every fifth step, on average, you’ll be under the cover of a tree. Our capital is actually so wooded that, following one United Nations measure, it counts as a forest. In this excerpt from An Opinionated Guide to London Green Spaces, discover 14 of the capital’s best-loved parks.