I couldn't find any other stipulation other than "regular" intervals when I looked into this either, so have plumped for every 2 years, however I've also worked in places where they do it every year. ******************************** Please remove this footer before replying. OCC-HEALTH ARCHIVES: http://www.jiscmail.ac.uk/lists/occ-health.html CONFERENCES AND STUDY DAYS: http://www.jiscmail.ac.uk/cgi-bin/filearea.cgi?LMGT1=OCC-HEALTH