Harry, and everyone else,
I'm sure Brian will get back to everyone on all of this when he's back in
circulation. He's not been around since these issues were raised. There is
obviously a lot to digest and clearly there are some specific points to take on
board so I'm sure when he's had time to
I've created a wiki page specifically about the tree data import.
https://wiki.openstreetmap.org/wiki/Birmingham_City_Council_trees_data
It would be better if somebody involved in running the import, would do this
(per the Import Guidelines), but I've drawn together various info I could find