Also
At least the Outer Hebrides have something of interest to spies like the Benbecula missile range. I was on Colonsay on 24 June 2009 and one of their photo cars was there ( no photo evidence since I failed to grab my camera in time). Basically Colonsay has one circular road and the chances of getting lost or not finding your destination are nil. Having said that I did meet some people who missed the turning for Oronsay!
Cheers