"oops - I think I was mistaken re wild sheep - - when I visited St Kilda I seem to recall the sheep there were left to their own devices presumably since the people left in (1928 or 29?) Think they are studied in the same way as the deer on Rum, but not interfered with in any way - -- "

Those are Soay Sheep, and they do indeed fend for themselves - I found them very skittish and wary of humans when I was on St Kilda, back in my sea-going days. I visited as a member of the crew of a schooner and our Navigator was an ex-Colonel. . The army presence there were reluctant to allow us to land, however upon hearing the ex-Colonel's name, they welcomed us ashore, pointed out the 'good bits' to take a look at, advised us to beware of the Fulmars nesting up on the hill, and entertained us right royally (and alcoholically) that evening in their mess.

Senoufou - St Kilda is a wonderful place, with an amazingly spiritual, 'other-worldly' feel to it. A definite Bucket-List item, if you can possibly manage it.