There are three triplicate Kinder Downfalls here - node/1566006025 a waterfall off to the side (the name for which should probably be on node/331157240), node/249527720 (part of the ford), and node/1914365633 (a "locality" - presumably someone has just copied a name off an OS map without checking whether the feature was already mapped).

I'm also not convinced that the path from south joins the river at node/811172821 , goes upstream a bit, then heads northwest. In my recollection it goes straight across the stream above the waterfall and then west.

Some of these paths have been reported to be private but this might require verification, see https://lists.openstreetmap.org/pipermail/talk-gb/2016-October/019270.html

As per changeset comment in changeset/32495687 , what's mapped here is surely incorrect. I expect there's a bridge and a ford, but no "magic third way".

being rebuilt - no longer a roundabout

being rebuilt - no longer a roundabout

This is is the wrong place. It should be further to the east, passing beneath the railway substation immediately west of the portal of Abbotscliffe tunnel.