The canal towpath is very narrow for some stretches between Devices and Bradford on Avon. Perfectly cyclable but you might end up negotiating pedestrians, dogs etc.
That's my experience too. I'm no lover of surfaces that aren't tarmac anyways, but I found it very stop-start / get off and be over-polite to a big group of ramblers etc. Took bloody ages in high summer
Any thoughts or feelings on this route out to Brizzle?
https://www.komoot.com/tour/1262604527