My fences are really 80cms. When I was doing the fencing my dad gave me the BTCV fencing book and in there it had fencing for sheep starting at 75cms height. So, I thought 80cms would be the way to go.
Gives me a smile reading so many of the responses of your amazing jumping sheep

! You're right Mooney, once they start they have to go....
Shygirl: Get fencing. Hmmmm, easier said than done! Lots to do and fencing certainly not top of the list and as I said i prefer lower than higher.
Shep: Tethering. Always open to debate. Why is it okay to tether some animals, eg. goats and not others? Of course I would always prefer not to tether given the choice. However, for me it's a question of animal welfare that they are tethered, if they weren't tethered they would have been butchered by now! I check on them about three times a day. Each time I check they are less tangled up, as I said Soay are highly intelligent. They are also doing a fine job of eating the brambles where I have them and what with them doing work for me rather than the other way around, I am much more loving towards them!