I'm not sure I understand this. Is the legal boundary the fence or the line of stumps? If the former you presumably have no right to plant anything beyond your fence.
Just had a pop-up on my screen saying 'Win a cutting edge lawnmower'.
30 Groundforce gardens?
And if you're interested in rats you might see a few!
Looks as though you will end up with an unbalanced-looking tree when you remove this branch. The exposed interior of the trunk might not be an immediate problem - laburnums seem to survive all sorts of disasters.
To add to what I said last summer, I did own a Lawnflite, which as someone said is a Honda engine on a different deck, and it was very good - deck not quite as robust, but that made it lighter to use.
Feed them asparagus until they can't stand the smell.
I think you may be going over the top, Kevin.
Has the tear gone into the wood of the main trunk or is it only affecting the bark?