Hello Ann,
I can recommend Hebridean sheep for conservation grazing. They are fairly easy to keep and become very tame, but they have a natural tendency to regard every fence as a challenge! They will go under or over anything they can, although good rylock sheep netting will retain them. I wouldn't use electric fencing - I don't think they would respect it, and their horns might get entangled in electric sheep netting. Their natural tendency is to creep under fences, so keep a tight bottom wire, but if startled (ie chased) they can easily clear 1 metre height. Fortunately this seldom happens with contented sheep. Once they get used to an area in which they lamb, they become "hefted" & will happily stay there. They will also snack on any bushes or small trees within reach, so hedging needs to be double fenced until mature.
They will happily follow a bucket, and will follow you into an enclosure, but do not like being rounded up & tend to scatter, meaning that they will run towards you if they think they are being cornered, and rush past you on all sides at about 20mph (or it seems so...), leaping high into the air as they do so.
On the other hand, they are affectionate & friendly, for example if I shelter from rain under a tree they are quite likely to join me & enjoy a clap (Scots term for patting). They are tough & perhaps less prone to foot ailments than commercial breeds, and so far mine have lambed without any human intervention. Often frustrating but never boring. I'm very fond of them.
John