The one from central manchester out to the velodrome has some nifty 'cyclists dismount' cobbled ramps at the locks, much fun, worth scally dodging for.
I've seen commuters on London canal paths and they seem to think doing 30kph around blind bends is legit. I don't think there's too many physical obstructions just other riders and the 4-across dog walking teams.
I do a bit of canal as part of my route and it's definitely the most stressful bit. There's no "convention" that everyone follows so you have to be awake and alert enough to react to every unfolding scenario.
The one from central manchester out to the velodrome has some nifty 'cyclists dismount' cobbled ramps at the locks, much fun, worth scally dodging for.