Hidden away in one apex of a St. Andrews cross of paths by Blackdown Lodge. The lodge (on army ground) stands in one apex, the barrow is in the opposite one.
Missed this completely the first time I went to look as I thought it was on the other side of the army’s fence !
Largely overgrown with several large depressions in the top, but still worth seeking out.
Easiest to park at the Hawley Lake sailing centre and walk from there.