Was contacted directly and asked to come in for a face to face interview with the senior sysadmin and one other manager. The interview itself was semi informal and quite straight forward and both people involved were friendly and approachable. I ran through my CV and then answered questions about my past experience and expertise. Some of their questions stumped me but I'm from more of a programming background. A more experienced sysadmin would have had no trouble. They do have some complex systems and the senior sysadmin will be able to tell if you don't know your stuff!