As long as you camp responsibly, Scotland's one part of the British Isles where you really can go wild. One of the classic places to pitch up is Glen Etive, especially around the head of Loch Etive, but beware that it can get surprisingly busy on summer weekends so set upwell away from the road.
Details Glen Etive is off the A82 between Bridge of Orchy and Ballachulish. For more information on camping responsibly see www.outdooraccessscotland. com.