Metal Detection is NOT permitted on Forty Hall & Estate under the 1979 Ancient Monuments and Archeological Areas Act Section 42(3).

If you observe anyone using a metal detector, or digging in the ground of the Great Field or anywhere else on the Estate, please... INFORM STAFF IMMEDIATELY OR CALL 101 - POLICE OR PARKS POLICE ON 0208 345 1139 to report the crime in progress and state the code 99/99 'other notifiable'.