Paul using Geoff's search engine and searching for 208 Bty I found another Bty member killed on same day on Dunkirk Memorial. Maybe it's his body in the unidentified grave.
CWGC :: Casualty Details
Some more from next day too.
CWGC :: Casualty Details CWGC :: Casualty Details
Also searched for "52 anti" for all of 1940 and got 23 results.
Looking at Div History they would be supporting 17th bde.