Your both wrong, Its a recently excavated Roman Town, Note the magnificent mosaic in the villa grounds. Obviously the site was left clear and flat to provide a field of fire for the hastily erected defences in this time of invasion scare. There were loads of defence lines and bunkers erected at this time across large areas of England, some in the most unexpected places many still exist. I remember playing as a child in one such bunker erected in 1940 in the midlands about 100 miles from the coast.
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