Thank you, that clarifies much. If my relationship chart skills are working, that means that John #1 and John #2 were First Cousins, Once Removed. It also means that John #1 and I are First Cousins, 5X Removed, while John #2 remains my Second Great Grandfather.
There are sure a lot of John and Warren Trestrails in Redruth and environs! But this helps a lot with this side of my Cornish forebears. The other side is more difficult, since John #2's daughter Annie married William Williams (apparently of St. Blazey) with no thought to future genealogists!
It is sad about the London Inn. From the land agent's site, it appears that the upper floor has been or will be converted to apartments, and the ground floor has been available for rent for over five years. It would be cool if some arrangement could be made with the Red Lion for some kind of joint operation, and taking down the plywood would certainly improve Fore Street, but there may not be sufficient trade in the area to permit such an expansion.
Thanks again.