Posted: 10/08/2014 at 20:15
It doesn't matter what you try thats leyllandii, it won't grow back and you can't train green growth back through it. Growing Ivy through it will eventually choke the hedge.
I don't know how tall it has become, but as any boundary hedge it should be maintained at 2m under current legislation.
Again I don't know how much space you have so I'd be reluctant to make suggestions without knowing more.
There will be options, there always are, a broader view of the area would help.