Bob ... I guess as England has no dedicated Parliament then Westminster passes UK law which gets varied by the devolved Governments for their jurisdictions leaving it applicable only in England. Don't think it's a reflection on their constitutional status.
Watching this thread as I have a cheap and cheerful metal detector that's decades old and really only good for finding lost keys in the garden ... I've got 75 acres to mess about in and according to the older OS maps there's been bronze age finds in the general locality.
K