Posted: 26/05/2014 at 08:34
I think that if it's your hedge you can take the whole of the top down - although I'd let the neighbours know what you're doing and why. You could say you've been advised to hard prune it in order to rejuvenate it and thicken it up, and say that you'd be happy for them to do the same on their side, or that you'd be happy to come over and do it for them if they preferred.
Cutting it back hard is what it needs - it may look bare now, but it'll soon look like a new hedge.
Just pull that ivy out and keep the base of the hedge clear of other plants - give it a top dressing of Fish Blood & Bone - it'll be great.