There is actually a London tree map
https://www.london.gov.uk/WHAT-WE-DO/environment/parks-green-spaces-and-biodiversity/trees-and-woodlands/london-tree-map
Thanks - unbelievably that's actually a useful map - I was having a discussion about a tree outside my house with my neighbour a couple of days ago. We thought it was Hickory. Turns out its Ash.
@christianSpaceman started
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There is actually a London tree map
https://www.london.gov.uk/WHAT-WE-DO/environment/parks-green-spaces-and-biodiversity/trees-and-woodlands/london-tree-map