Hey Geoff,
I do not know this John Etherington you speak of, however he could be a far off relation. My great grandfather James Etherington b.1915 moved to turners hill, and resided in Uckfield where my grandfather was born. I've always heard stories about my family from lurgashall, and the graveyard at the church which is home to a lot of James Etheringtons are my relations. After my grandfather passed away in 2004 I decided that I should really start a family tree because no one in my family has one of the Etherington side.
I have reson to believe that my Great grandfathers dad was called Arthur but I still have this yet to prove, probably over the next few months I might take a trip to Lurgashall, and look at the parish records and hopefully I will find the thing I'm looking for.
If I were you I would take a trip to lurgashall and see if you can find anything out about Harriets family. I do know that the clergy of that area did their own census to see who was currently living there. If you manged to do this I would love to hear how you got on, because it'd be fascinating to know if we were related or not.
Ali