Once upon a time (way back in 2007!), I was walking home and noticed the door on my road's Telewest distbox was hanging open (the lock had been forced). Having always wondered what was in one of those unassuming grey (or green) street cabs, I decided to have a quick look... And take some pictures. (And yes, I did let Telewest know the box had been broken into afterwards)
If you notice some of Virgin Media's "street furniture" that needs some looking after, use the form on their web site to let them know: http://allyours.virginmedia.com/forms/cabinet.html.