We left Glasgow at 07:00 and it was 09:10 when we finally drove down to the slipway in the little village of Crinan in Argyll. Across the Sound of Jura, the horizon was blocked by Jura to the south and Scarba to the north. Hidden between them lies the great Gulf of Corryvreckan through which surge some of the most powerful tides on Earth.All was calm as we left Crinan on the last of the ebb