I find the bank charge and rules for fishing on canals quite hard to swallow really. In my area the towpaths are free to use for cyclists (of which I'm one), dog walkers, ramblers etc....however anglers have to pay extra.
On the flyfishing front, is casting a fly potentially more dangerous than a cyclist or an unleashed dog? If your canal is anything like my local cut, any casting with a fly rod should only require a roll or side cast, therefore keeping any ironmongery over the water.
Bit of a lame excuse to
a. Charge environmentally friendly anglers to fish on a public right of way.
b. Prevent fly fishing due to public safety.
BTW, similar argument for the public areas of the River Dee where PAA have the fishing rights

SHOULD REMAIN FREE FISHING!
Sorry, just back from a liquid lunch so had to rant.