So Tharsis in Hebburn could have have various company names if required. Maybe this is why the maps of 1895/7 do not have Tharsis name just Tyne Works.
We will never know, but to the people of Hebburn the Tharsis name stood.
I think I will try the Census returns of 1891, 1901 & 1911 to see if it shows up on them. I assume that will take a fair bit of ploughing through.
Thanks again Allan C.