Thirlwells was located 21 Bridge street , which i believe Bridge street is now Thornaby. There is Victoria Bridge in stockton over the river Tees, one side of the bridge is Stockton on tees which is Durham , the other side of the bridge is Thornaby on tees which was Yorkshire then.Its not a huge bridge. Boundaries change . There is a Bridge road stockton not sure about a bridge street maybe long gone . If you go onto this website below and type in a few searches you may find something. sue http://picture.stockton.gov.uk/default.aspx