the impression I get is Scottish cops (and even English ones!) do actually have better things to do than patrol areas looking for noisy parties but in England at least there are a lot of angry locals who will grass up the party as soon as they hear the music, and once someone has made that call its hard for the cops to ignore it unless there are riots, rapes or murders going on at the same time in the same area. Even then cops these days often can spare a unit or two, and if the victims of the violent crime are themselves young they have been known to even divert units from the major crime, stop the rave and then tell the media how the youths holding the rave caused an unneeded diversion from dealing with the big crime!
Whilst depending on terrain it might not be an issue in Scotland, in this part of England what usually happens is people think they are away from civilisation but there is usually a elderly couple or rural family in a high value country house who hear the event, disagree with is being there and grass it up.
services like Google Earth can be useful if the photos are detailed enough 😉
