Looking at the sketchbook of William Whitelock Lloyd, a soldier-artist who joined a P&O liner after surviving the Anglo-Zulu War, I’m reminded why I avoid cruises. On board this India-bound ship were: a ‘man who talks a great deal of yachting shop and collapses at the first breeze of wind’, ‘a successful Colonist’, and ‘the victim of mal de mer who lives on smelling salts’.