Gurkha Security Services Ltd. As a Company, we have invested considerably both in terms of time and finance into ensuring that our policies and operating procedures are of an internationally recognised standard. Gurkha Security Services is an Approved Contractor Scheme (ACS) with the Security Industry Authority (SIA) operates the quality management system ISO 9001:2008, Peninsula Employment Law accredited, Building Register Approved and Contractors and Health and Safety Assessment Scheme (CHAS).