Looking for some MN insight/first-hand accounts of those who have experienced similar issues. I have a slight problem with a neighbour's tree overgrowing my boundary and blocking light to an upstairs window. The problem is that the property that the tree is growing in is a rental, and I know that the tenants have no interest either way in property or garden maintenance, which is fair enough, I guess. Whilst I know that I can pay to have the branches trimmed, does the landlord have any responsibility to bankroll this if the tenants will not address the issue? I'll be honest, I'm loathe to pay out for this to be sorted when I feel that it's not a problem I've created. I know the letting agency details, so could feasibly contact them to inform the property landlord directly, but does the landlord have any obligation to act? Additionally and perhaps crucially, would asking this make me look like a CF? 
TIA