About Us Staff-Line is operated by Network Services International (NSI) Limited, a company predominately involved with information systems for the UK police and military. The vast majority of NSI personnel have police and / or military backgrounds, including both police and military intelligence at New Scotland Yard and in arenas such as Northern Ireland. Senior management within the company have been involved in the management of the Metropolitan Police's Crimestoppers office at New Scotland Yard. We take pride in our knowledge of information and intelligence systems and their transferability between military/police environments and the rest of the public and private sectors.