I’m researching an Ellen Doggett she worked as a cook at a school in Upper Brunswick head mistress Sarah Kemp (1871 census) I can’t find anything about this school after this date! Sarah Kemp was born in Southminster Essex. Ellen was born in 1843 Clophill Beds.
You have evidently lost the school at 11, Upper Brunswick Place after 1876 because the road was renamed to Brunswick Place and the building was renumbered 29 at that time.