Re: I have a job interview tomorrow with virgin media for a cable guy
That'd put you in good stead, it's novel and will show how you react in public speaking.
Technical test? wire up a phone socket with etension using the diagram....very technical.
They're more interested in you, how you appear to others and your ability to stay calm under pressure of irate customers and the like, they will teach you the tech stuff you need, long as you can read a test meter and multimeter