I visited that area today, the large barn covers the concrete gun positions but you can still just about see where they were on an Google/Apple Maps.I live about a mile from this site and I have just checked on Google earth and it now shows that someone has completely destroyed this site, such a shame it leaves nothing for future generations to see.
I used to do a lot of metal detecting in the fields off to the west of here and the amount of pieces of anti aircraft shell that is laying around is amazing.