The henge was supposedly aligned on nearby Chapel Hill (much more detail in this excellent study: uea.ac.uk/~jwmp/CAA2003.pdf ). This hill, now obliterated by the Norwich to London railway line, was once surmounted by the parish church of the deserted medieval village of Markshall. The nearby village of Caistor also had its church away from the village, in this case in a corner of the ruined town of Venta Icenorum (perhaps on the site of one of the town’s temples?). Incidentally, both of these churches were dedicated to St Edmund.
The naming of White Horse Lane adjacent to the site is intriguing. Now, I may have been staring at this for too long or spent a little too long in the sun, but I think there could be a hint of the outline of a horse figure in this photo: heritage.norfolk.gov.uk/map-record?UID=MNF6100&BBOX=623931,305974,624012,306055&CRS=EPSG:27700&count=1&ck_MON1=true&ck_MON=false
Just outside of the northern curve of the henge, I’m seeing a head due north of the western electricity pylon, and two hind legs just to the left of the eastern set of cables. Just me?!