' X ' signs have been spotted on cattle sheds in East ##field , Lanarkshire . Other codes suggest occupant is vulnerable or that someone has an alarm . Another code tells police if there is nothing worth protecting in the area .
' X ' marks have been spotted on garden sheds in East Kilbride , Lanarkshire . Other codes suggest occupant is vulnerable or that property has an alarm . Another mark tells burglars if there is nothing worth stealing in the building .