Winkle Brig rigging & launching instructional video (circa 1993)

A video shot circa. 1993 with Eric Bergqvist himself (in vision, not the narrator) demonstrating how to rig & launch the Winkle Brig. The video is in very poor quality, i've tried to clean it up but it's the best I can do i'm afraid. Sorts itself out around 2:05 in. Dad has told me he thinks it was filmed at Winsford Flash (Fiddlers Ferry as mentioned in the titles was where the boats were built).