I have a copy of this book Wayne and recall the same puzzlement over references to non-existent diagrams too! I think it must have been a printer's compilation error, missed at the final proof stage.
When I first read it, I was somewhat surprised to find myself in a photo on page 122! I'm the (then) fresh-faced looking cove, grinning in the foreground!
It was taken in January 1989, when Barrie kindly invited me to join him, Colin Brett and Tim Cole for a day's piking on the Old Bedford. We enjoyed something of a 'red letter' day too, after finding the pike heavily concentrated in just a couple of hundred yards of the river.
Despite their murderous looking scowls in the picture, Colin and Tim were the most convivial company. The bankside fry-up that Tim prepared for us all that day included the best sausages I think I have ever tasted. Happy memories!