Posted: 12/06/2014 at 07:21
Sorry - I've never yet seen a Leylandii where cutting back into the brown wood has resulted in a pleasing look.
In my experience they're an All or Nothing sort of a hedging plant - either put up with them as they grow or get rid - they do not take kindly to any type of 'management' other than a regular light trim.
If that were my garden I'd pay almost anything to get rid of them (I did here) and replace with a fence with trellis on top. Covered with clematis, honeysuckle, roses etc it looks great and will be glorious in a couple of years' time.
Just work out the square metre-age of useable garden you'll be gaining!!!