ircumnavigator, Rob Hart, poked the glowing embers of his coal stove, set a cup of tea in front of me and said: ‘You know the best thing about a concrete boat?’ I had to confess I did not. ‘The worst ones are at the bottom of the sea,’ he added. ‘Concrete’ as a material for a sailing boat is quietly looked-down upon by some who see it as a cheap, corner-cutting
