Some of this is tagged as footway - presumably actually part of NCN 4? (And surface tags would be good!)

NCN550 appears to continue to Caldon Canal towpath

NCN550 appears to continue along towpath and then to Ipstones

Bridge opens to bikes 2016: http://www.memphisdailynews.com/news/2014/nov/10/harahan-boardwalk-construction-begins/

All these roads need a surface=unpaved tag

Work underway on constructing this section of cycle route AIUI.

New cycle bridge over the Aire round here apparently: http://www.sustrans.org.uk/news/sustrans-kicks-40th-anniversary-celebrations-skelton-bridge-opening

What's the current state of Long Lane? OSM has it as impassable (two access=no sections), but my understanding is that it's reopened/reopening to non-motorised traffic while remaining closed to cars.