I've just found you by Googling and joined up on the spot.
I don't know about your specific family but it seems there was a whole exodus from Monmouthshire to Teesside as workers followed the iron and steel industry in the mid-late 1800s, even to the extent that they built a number of Welsh speaking chapels up there. I have found one - probably the only one - historic document on the subject. I don't know how to attach stuff but if you come back to
(*) I can pass it over.
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