“You have all heard no doubt of the discovery of a hidden chamber at Ingatestone Hall in 1855. This was undoubtedly what is called a Priest’s Hole for hiding both Priest and vestments in the days when Mass was illegal. It measures 14ft. long, by 2ft. broad and 10ft. deep and was approached by a trap door and ladder and when discovered contained a chest for vestments and vessels”.
Laurie, Major Allan D. Antiquities of Essex (1946)