SANS are running a WhatWorks in Penetration Testing & Ethical Hacking Summit on September 17th 2008 at the Le Meridien Piccadilly in London.  The summit is a one day indepth look at the latest techniques and best practises you should employ to run penetration tests against your networks.  So whether you are responsible for securing your own network or the networks of clients this is an excellent opportunity for you to enhance your knowledgebase.  YOu can register for the course here.