Haven't done it yet - waiting for the right moment haha.
Time is by your side.
If you live in the north hemisphere winter is coming , so it's probable he won't be smoking in a garden so much in colder days.
Did you ever ask him for a smoke?
Why would I want to even communicate with that degenerate and why would I want any of his shitty weed? It's already freezing here and he's out in the garden at 3AM, so I don't think the cold bothers him.
for context, what kind of a brit are you? yorkshire? londoner? or better yet, do you have a cockney accent? do you live in an ali g kind of neighborhood yo?