No.1 (TL072064) - probable location for a pillar & stall chalk mine, all entrances blocked
No.2 (TL078066) - possible pillar & stall chalk mine under brickfield
No.3 (TL081068) - possible pillar & stall chalk mine under brickfield
References
“Caves & Tunnels in SE England Part 6”, Chelsea Speleological Society page 40-41