I am new to this type of design of walls, haven't come across any before. Not really sure if it's a pillbox, but the tunnel is similar to the one found at 411, only without the top part.
Top left: mini tunnel
Top right: brickwork at the bottom of the of the two walls left standing
Bottom: the two walls with indents and patterned wide bands.
Date picture taken
16 Mar 2021
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