ISL Dardan Ltd was incorporated on 16th May 2002 to effect the merger of Dardan Security Limited and Integral Security Ltd. I ... n January 2009, Gardwell Security and ISL Dardan Security were brought under common ownership and the two businesses were merged in July 2009. At this time the company changed its name to GSL Dardan Ltd. Dardan Security was established in 1973, Integral was founded in 1979 and Gardwell was founded in 1996. The experience of providing security services to many of the region's top companies enabled us to build up a substantial client base in East Anglia through the provision of on-site and mobile security services. read more