The village of of Holme Fen, specifically Holme Posts as depicted above, is probably the lowest land point in England at nearly 3 metres (9.8 ft) below sea level. Wikipedia
UK’s lowest spot getting lower
“Conservationists have raised concerns that the lowest land spot in the UK is sinking.Holme Fen, a national nature reserve near Peterborough in Cambridgeshire, has sunk by about four metres since draining work began in the 1850s, leaving it about 2.75 m below sea level. ” BBC
Holme Fen is a rare surviving relic of the vast fenlands that once covered the countryside in parts of East Anglia. Listen to BBC documentary about Holme Fen here.