WW2 HAA gun emplacement

Some progress.

I have a copy of Roy Taylor’s ‘Shoreham’s Radar Station’ in which he explains the following:

Two smaller operations also existed under RAF Truleigh Hill control. On its journey to Truleigh Hill, the truck or coach stopped at a point opposite the track to New Erringham Farm. Two or three airmen alighted and then vanished into foe field on foe western side of the road. Their period of duty was at the direction-finding fixer station, sited on a high point approximately 100 yards into foe field. During the 1950s ROTOR period this had been part of the Southern Fixing Chain, alongside others at Berkhamstead in Hertfordshire, Portland and Sherborne in Dorset, and Pewsey in Wiltshire. The fixer station was a small hexagonal, partly sunk brick building with a tall timber tower. On the list of UK fixer stations, it is listed as ‘Bury’, and was always referred to as the ‘Bury Fixer’. The significance of Bury, a village above Arundel some 15 miles away, is not clear. Three of these carefully placed units could each pick up a signal from an aircraft and relay a bearing to the Triangulation Table at the Sector Operations Centre. There, with an unbelievably simple system involving three pieces of string, the ‘fix’ where the three pieces crossed was radioed back to the aircraft. A similar system operated from Truleigh Hill during wartime, with the lower brick section of the building still in place in the field behind the barn on foe South Downs Way.

 

Fixer Station detail is available here:https://frontlineulster.co.uk/direction-finding-part-ii/

 

I have cleaned up the concrete pad that's located near the mound. Any ideas what it may have been?

 

It looks like a concrete lid to cover a hole. Perhaps air raid shelter entrance in the past

 

It was there in 1944. There are witness marks from old brickwork that was on top.