Kessy is just unbelievable, she knows what the sheep are going to do before I do. She can head off whatever they try to get away with before I can even react. Today, they tried to take off as we brought them out of the pen while she was holding her stand at the gate - imagine a 100 sheep stampede. But I can just send her after them and the next thing I know she has them gathered right behind me and they are oh so obedient.
It did take a year and a half or two years before I was able to rely on her 100% - and it was a lot of work since she is so fast, drivey, intense...but in the end she exceeded all of my expectations.
Kira is also developing really nicely so far, she shows such nice instincts and she's always been so mature for her age. I hope the weather cooperates so we can start having lessons more consistently.
Nigel - these are not my sheep, but maybe I can answer your question (or can ask the flock owner). If you want, you can post it here or PM me, whatever's easier.