Over the border into Norfolk today to visit Waveney Forest - looking for Waveney Redoubt which sounds similar to the one at North Warren - didnt find it but many training earthworks in the forest including a possible LMG emplacement (although I'm not fully convinced!).
Top and second down - 1st world war pillbox.
Third and fourth down - type 22
Fifth down - possible LMG weapons-pit with 'extension' for bren tripod to fire on fixed line.
Bottom - LMG weapons-pit with extension for bren tripod to fire on fixed line - Military Training Pamphlet No 30 Part V Protective Works