I used to cycle past Telehouse Docklands (in East London, part of LINX IXP) as part of my daily commute. I was always struck by the lack of physical security; all that was visible was a typical warehouse fence and a couple of cameras. However what was most troubling was the sheer density of unguarded under-pavement communication cabinets surrounding the site (of course I am only speculating that they are associated with Telehouse).