Just leafing through mine, few immediate observations on graphic style:
First few pages all ticking along nicely and pages 8 and 9 look good, 8 to 13 simple 'nuts n bolts' layout - the floating shadow around the pics is not my cup of tea but it works as a page layout generally.
Pages 14 and 15 eek: lots of white space around 'dressings', formatting of pictures, text etc bit of a muddle (IMO). Nymph on left page might have lined with right text column? Brown base to page works ok but crosses to top of facing page and imbalances the two pages.
16 through 24 works well.
Then some surveys and functional pages, although four pages of FFFT 'red band' a bit distracting and the page numbers have been booted.
Then a full page photo of good quality, another full page add, then a nice fitting page layout for Derek Bradbury, the black background and simple layout has more impact than the FFFT ones set out previously.
Return to page numbering at 36 with full pages of text through to 38, then an arty full page nymph shot (that I'm not so sure about due to the half page of out of focus background material - atmospheric but a bit space hungry).
42 through to 43 neat and functional, although pics next to fly types might have been better. Not sure of the off the top of the page layout of pic on 41, cross page on 43 works better.
Page 44 ok except for the floating shadows (IMO) and if the shots are of flies that are covered in the previous page's dressings, it might have been worth referencing them in some way, or getting them in amongst it (IMO).
Have not read the content yet, which likely demonstrates how shallow and superficial my comments are; meant to be constructive though (you did ask), still a good document as ever, even for us pedants