I started this thread by mentioning emmband's interest in discovering the relationship, if any, between James Ward Usher, and Fred Usher. Well, thanks very largely to the help of Geoff-E and dcbnwh, I can now report that there IS a connection, in more than just the name.
I have put together a fairly detailed family tree that shows the link, but for the moment I will just summarize it in words, rather than in pictures.
The link between the two lines is the husband and wife: John Usher and Elizabeth Robinson, who married in 1773.
One of their six children was Richard Usher(1778), who married Milicent Radford in 1800. They had seven children, one of whom was James Usher(1807). He married Jane Duckett(1811) in June 1842, and one of their childen was James Ward Usher, the subject of this enquiry.
So according to this tree the grandparents of JWU were Richard and Milicent Usher, not James. This is consistent with Mark Usher's tree of "Ushers in the censuses".
Now the line that leads to Fred Usher. If we go back to John Usher and Elizabeth Robinson (m. 1773), another one of their six children was James Usher(1788). He married Anne Otter(1790) in December 1809, and together they had seven children, one of whom was John Usher(1816). This John Usher married Margaret Kent(1823), and they had seven children. One of these offspring was James Usher(1840), and he married Sarah Buttery(1841) in December 1862.
And now we are there, for one of their children was Fred Usher(1870), who married Amy Taylor, and the rest is more recent history . . . .
I think this is about right, but would be very happy to hear of any corrections.
I'm no expert on this, but I think that makes James and Fred second cousins, once removed.