Yes Ned, there are some magnificently kept leylandii hedges. I, as a garden maintenance man myself (almost 9 years self-employed, picked up much knowledge and experience, but still hesitate to describe myself as a 'gardener' just yet!) am in care of several of them, including the fabulous golden Castlewellan variety.
But, whilst there indeed are many a cowboy out there in my sphere of employment, I have also encountered many the client who will insist and assert their will on you and their plants, even in the face of your best and sincerest advice. Even when there is easy money to be made from those types and their stubborn ways!
Currently, I am 'debating' with a very controlling couple who want me to reduce a Castlewellan and Leylandii Cypress hedge by several feet. I could easily charge them £300/400 for doing this (the leylandii is about 70/80 feet long, Castlewellan arounf 15 feet long). And they are happy with that cost. But, I am unconvinced at this moment if they will 'green-up' again on top as has been suggested by a few in this thread.
My only comfort may be that, as it's only the top coming down to old wood, that the lower parts will continue to grow and eventually grow through the nasty scar on the top (a few years?) well enough to eventually trim as you would the top of any hedge.
But any one with advice on that would be welcomed, I am nervous about doing this and seriously considering asking them to get someone else to do it!
Terry Deans