Turret 15B was thought to have been located in 1931, in the expected position. The 1931 investigation reported little more than footing. An English Heritage Field Investigation in 1966 noted that the Turret was covered by the modern road, and a further English Heritage Field Investigation in 1989 cast doubt on whether the footings reported in 1931 were sufficient evidence for the existence of the turret at this location.[5]
Location on Ordnance Survey 1:25 000 map: 55.008241°N 1.872541°W