I got this response from Kevin East at Canoe England to my enquiry.
Thank you for your enquiry. Access Arrangements are being posted on the Canoe England web site at:
The page is currently in build and compiled from a combination of links to the Canoe England regional web sites that post these details and separate documents provided by the Regional Waterway & Environment Teams. Some verification of information is required before a complete listing of arrangements will be available.
Waterways and Environment Manager