Posted: 12/04/2016 at 12:45
Unfortunately, six inches below ground level isn't deep enough to stop rabbits burrowing underneath. If you should decide to try the "wire" option, you'd need to dig at least 2 ft down and then place the wire in the hole in such a way that the lower part of it is bent//turned outward from the boundary. This can work - sometimes - to keep the rabbits out. Not really worth it, however, as they'll usually find an alternative route!
The most successful - actually "tried and tested" - is to have two semi-feral cats. Your local RSPCA would probably be delighted to rehome them, as they are usually the ones which people don't choose, because they want a "house cat" rather than a semi-wild outdoor one. The cats will live happily in a shed - need cat-flaps for access - and do need to be fed each day, though they will catch and eat young rabbits. The most useful thing, however, is that they can be outdoors 24/7 - which of course no dog would be - and they will hunt/lie in wait for their prey and thus act as a deterrent too.
My two whippets do catch rabbits in the lane from time to time, but those in the garden usually manage to escape through the fence or down into the burrows.
edited to add that since the last of my two cats died, the rabbits have taken over again..................