Dunno about Virgin Media but i had a mate who was a tech for them when they were ntl.
There's not a lot of electrical work there - mainly surface clipping where you can to get the job done as quick as possible, and a lot of the customers are pretty scummy. You get a lot of flack off them as well because it's a big company.
Of course that's just generally speaking - if you've got nothing else atm give it a whirl - you might like it and if it's rubbish you can always leave.
ntl used to give their permanent staff free family pack cable and telephone line rental, and half price on everything else apart from phone calls, eg call features, broadband, sports and movies, 'adult film content' etc.