High adventure on a small budget - this is Charles Stock's philosophy as he cruises his midget 16 -foot gaff-rigged sailing cruiser Shoal Waters on the Thames Estuary, having logged 68,000 miles since 1963. No engine, no electronics. The art of pottering taken to its zenith, and happiness achieved with great simplicity. There's a lesson here for all of us who hanker after the South Seas!