The author Coxe in ‘Haunted Britain’ mentions that there is a haunted well in St. Osyth but provides no further details. Further research reveals that the ghost of St. Osyth, the Mercian princess that gives her name to the well, haunts it. You can see the well pictured above.
For more information, please read Haunted Britain by Antony D. Hippisley Coxe.