Found this to be an interesting and insightful Youtube Channel from Virgin Media:
http://www.youtube.com/user/VirginMediaHelp/videos
The interesting thing is Virgin have used their own staff in the videos. The guy in the following video installed TiVo in my house last April!
http://www.youtube.com/watch?v=9BnbpH-_SrY
He knew his stuff. I remember him telling me something like he didn't usually do installs however they where so busy with TiVo orders he was out in the field.