Hello Les,
Wiltshire Treasures website has a picture of New Canal in 1886 - I know it's a long time after Charles Belin left, but it gives you an idea of how its changed.
I tried to do a direct link to the photo, but couldn't, so if you click on the "Start Here" button, then type in Pig Market New Canal in the Search Box, it should take you direct to the image (otherwise it means going through 150+ photos, most of which are from the 1970's.
http://www.wiltshiretreasures.org/Yorkslass