Deptford Terrace was some way from St. Andrew's (built in 1841), and the school in Church Street. which pre-dated the school between Neville Street and Australia Street (built 1861), the site of which was a brick field on the '1856' Ordnance Survey map. There were very few buildings on Deptford Terrace at that time and unfortunately the school is not marked. Southwick Lodge was at the east end of the terrace. Sunderland Library have the large scale 25 inch to the mile 1855-7 maps which will show the area in more detail. I don't live in Sunderland so I am unable to go and have a look. Some Sunderland Streets are named after former well known landowners, other prominent people, as well as the former local residences of the merchant 'princes' of the town. Also, as in many other towns frequently after poets, statesmen, warriors, kings, queens, and princes, naval and military heroes, and famous battles. Stan