There is a few, so I’ll put ’em all into a single blog post 🙂
Highly recommended: Burned, Dropped, Drowned: HDD Recovery In Pictures. I hope that you will not encounter into such situations, though :).
Apart from official IT Security events, London ethical hackers like to organize monthly meetings such as DC4420 in clubs, sometimes changing their location. In an informal manner they exchange their experience, represent new ideas and technologies.