Hi Dawnie. It's a while since I've run along the Cromford Canal but I do recall 1 tunnel which was long enough to prevent my Garmin watch from getting a signal. Even so, you can see daylight at the other end so it depends how much the dark is a concern for you. as I remember, you come off the canal & down to the road with a short distance to the Hurt Arms.
I must say I really enjoyed those runs along the canal & I hope you can enjoy them too.
Booktrunk I've been lurking for a long time & was full of admiration for you when you decided to take this on. I felt very disheartened for you when I read the message about C017. I can't imagine what it must have been like in today's conditions. No doubt Ladybower will be like a walk around the park in comparison .
Could I ask for some idea of what you're thinking of as long distance? Is that in a single run or per week / month? At the moment I don't run as much just now but maybe I could help. If you could give some idea of distance I'd know better.