Greek islands. They conjure visions of cerulean waters, sandy beaches lapped by gentle waves and shaded by tamarisk trees — perhaps a holiday of sun and fun.

For those in the shipping industry there is, though, another fascinating dimension: so many shipowners have sprung from these often rocky isles.

Greece is a small nation but it has some 6,000 islands and islets, of which 227 are said to be inhabited.