Posted: 28/07/2015 at 09:02
If it's top heavy then the height needs reducing. I'd totally renovate the hedge - reduce it's height by at least two thirds, clear the base of any dead wood, weeds, grass etc and feed with Fish, Blood and Bone and water well - then stand well back.
If it's the sort I think you're describing (a small darkleaved evergreen) it'll produce new growth from lower down and you'll get a decent hedge again. This time don't let it get too tall