As regards the turrets in pits ,it`s totally true as I ought a Lacaster FN 82 rear turret from this excavation.There were FN 50`s,FN82`s ,FN5`s and FN 120`s the latter only being fitted to Lancs and all the rest used on Lancs.
Can anyone suggest where the turrets possibly came from ??? …and don`t say a Lancaster Base !!.