Posted: 05/09/2014 at 16:44
As others have said, cut it back even further than you dare! Then clear out any rubbish from the base and in February give it a good sprinkling of Fish, Blood & Bone. You'll have a lovely hedge by next summer.
When you trim the hedge, try to trim it to an A shape, wider at the base than the top. You'll get a hedge which is green from top to bottom that way