I feel certain it will turn out to be the group of back to backs facing the burn at the end of Newburgh Row. The 'back to backs' are the old Radcliffe, aka 'Radcliffe Terrace' - that's the chevron shaped rows in the middle (Long Row) the north south 'Cross Row', and this bunch at the bottom near the burn.
Or that's the way I understand it.
The single terraced houses were later -,That is the single terraces in Newburgh Row, which was joined on to the older group of back to backs near the burn, Leslie Row and Dandsfield Place rows - all built later.