Sorry Kelly58, just seen your post.
We have Soay and in general they have been fairly easy to catch. We use a hurdled area where we feed them regularly and call them in using a bucketful of food. Then usually just close the gate once their noses are in the trough. They are clever though and notice if you are carrying anything 'suspicious' or if they see two of us they know something is going on!
For some unknown reason, they haven't been playing ball lately and dashing out before we could even attempt to close the gate up. Possibly they are not interested in the food really as they are up to their necks in grass at the moment!
Once in the hurdled area we close up the area to make it smaller. We are thinking of making a better system soon which may include a make shift 'race' to make handling easier. Those horns can be a danger and one of the wethers that we have at the moment is a little 'highly strung' and could hurt himself or someone else by charging about as we bring the hurdles in to decrease the size of the holding area.
Boreray share a lot of genetics with the Soay so guessing they are similar in their behaviour.

How do you handle things?