Penetration Testing

ProCheckUp are used by some of the world's leading finance and banking organisations, UK Government, international law firms and blue chip companies. The award-winning ProCheckNet technology allows ProCheckUp to provide the most comprehensive and effective penetration testing service available. ProCheckUp's expertise in security and commitment to technological innovation were recognised with The Queen's Award for Enterprise 2004, the UK's highest accolade for business performance.
London,
http://www.procheckup.com

Network security consultants offering compliance solutions through technology such as behavioural IDS, anomaly detection, email archiving and policy management.
http://www.armana.co.uk/03/0306.htm