Pillar & stall mine accessed by shaft with manhole cover
References
"Caves & Tunels in SE England Part 4", Chelsea Speleological Society, page 51
References
“Caves & Tunnels in SE England Part 5”, Chelsea Speleological Society page 40-42
References
“Caves & Tunnels in SE England Part 6”, Chelsea Speleological Society page 32 + 34