Hi Everyone Thank you for the replies. Just for the interested there is apparently an NHS Approved Contract list of suppliers amongst other "Net Defence" by a company called Content Keeper at www.contentkeeper.com and Surf Control at www.surfcontrol.com My thanks to the people that answered. regards Linda Linda Riley B.A. (Hons) MA MCLIP Knowledge & Libraries Manager Education Centre Library Royal Infirmary Blackburn Lancs BB2 3LR Tel: 01254 294308 Mobile: 07970015152 email: [log in to unmask]