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Thanks, both - ZM, part of maintaining my property correctly is not allowing plant life to overgrow it, block windows and encroach on the roof. If the greenery was all on my side I'd have dealt with it before now. Murraymints, you're right to an extent, but my neighbour has to be properly informed and given the opportunity to deal with it himself (he has been) and if he objects (and going on past experience, he will) I have to be prepared to show that the work is necessary. Given that I'm prepared to pay for it, I had hoped he'd be sensible, but if we have to take it further, I need the right kind of person to provide a professional opinion.