Just thought I would post an update after fishing the Lovers Walk stretch at Matlock Bath today, I didn't encounter any barbel but I think that there must be huge potential here with a wide river and 9-10 foot of water under the rod tip.
The water looked quite steady from above, zero degrees when I arrived but the river did have a good pull to it at normal level with lots of autumn leaves coming down and it made a nice change to catch some wild brownies and a couple of lovely grayling on the stick in a great setting, really making the effort worthwhile.
If I were doing this often I would definitely invest in a Matlock DAA book after paying a fiver for the day ticket and another fiver to park for over four hours, and it is a good walk from the car park to the swims across the footbridge on the far bank but again well worthwhile.
I will definitely be giving it a go with the barbel gear at some point.