The Isles of Scilly are renowned for their natural beauty, wild flowers and temperate climate, but there is another reason to visit these paradise islands. Since the 16th century they have been in the frontline of this country's military defences and successive generations of fortifications have survived in Scilly, unmatched in any other location around Britain. This unrivalled survival was due to the lack of pressure to develop the islands and happily because the feared enemy rarely attacked. H