Allan-Williams Turret just off A414 North Orbital road Park Street/St Albans borders accessible from the layby. Grid Ref TL1580304821 Glad to say it is listed Allan-Williams Turret, south of A414 road, St. Stephen - 1425803 | Historic England
Oh so that's what they are called. Remember finding one of those when a teenager near the Vickers factory near me. Not much left of them now. Allan-Williams Turret | The Pillbox Study Group Website. (pillbox-study-group.org.uk)
An Allan Williams steel turret in situ, sited to defend the N end of Radlett airfield. Measuring some 6ft in diameter x 3ft high it is made of five-eighths inch steel. It has hatches in the top and side and steel rollers to turn the entire dome through 360 degrees. There is a gun bracket located immediately below the top hatch, probably for a Vickers or Bren gun in an anti-aircraft role. ALLAN WILLIAMS TURRET (ID: S0006564), St. Albans, Hertfordshire, England Hedges Farm, Napsbury - in a belt of trees 20 yards from the A414 road at the N end of the former Radlett aerodrome., Condition: Good (Grid ref: TL 1575 0479)
