I don't know the area, but general canal advice is Perch love features. Locks are the best bet. Failing that bridges are always a hotspot.
Narrow boats, overhanging trees, vegetation etc. Anything that breaks up the straight lines of the canal.
Use a low, bouncing retrieve with a red and/or silver fly through these and you'll get some little 'wasps' at the very least.
In my experience Pike are similar, but favour the vegetation. Zander prefer the bridges (or anything else with shade) and tend to stick to the bottom.
I would exercise some caution fishing near narrowboats. In some, designated mooring points, angling is not permitted and some boat residents can be anti anglers due to issues with tackle, mostly weights and spinners etc, banging against the side of their boats - they don't differentiate in favour of fly anglers.