How long before there's "One Bill"?

DigitalSpy has a short item on how Virgin Media might one day offer utilities (water, gas, electric) as a natural extension of Virgin Media's current quad play offering. I'm wondering how long will it be before we see "One Bill", as Virgin also sell mortgages and insurance they could have a unified, all household expenses (bar food) bill. I guess if Tesco (who already do food, telephony, broadband, mortgages and insurance) got into the One Bill business, they could even take care of the food (or maybe the Virgin Group will eventually buy out Sainsbury's).