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I'm on the canal for about 6 miles(out of 14) for the most part it just removes the need to remember a complicated route across a bit of London I don't ride often as I can just stay on the canal, it's crap but it's not take a wrong turn and only find out 10min later being late to deliver training crap. Very different on the canals North or East as they aren't that long and the alternatives are much better.
I don't understand why anyone would do any significant distance on a canal towpath unless it was for leisure.