The late Alan Bourdon was former employee of Tyler Boats and S.O.S. in Poole. Later he became a Yacht Broker specialising in Van de Stadt designs. When I went to England with my father on a one week holiday looking for and Excalibur to buy, he had two for sale; ‘Avalion’ and ‘Astolat’.
Each of his Excalibur sales brochures contained an introduction to the Excalibur design, including those for ‘Avilion’ and ‘Astolat’. I recall visiting him and his wife in Poole where a half-model of Excalibur was hanging on the wall in their house.