The thing that technology-minded folks in this thread fail to understand is that a huge number of customers value having "one bill". This is extremely common at Vodafone and we're seeing this play out more in the energy market where it's incredibly common to see gas, power, broadband and a "promo" (tv? fridge?) offered on the one bill. Some are even offering mobile. Customers are much less likely to churn when all of their services are in one place, especially if it means multiple bills.
IMO they really missed out on the opportunity to buy Stuff Fibre, assuming they were offered or knew (this is Sky management we're talking about). Could've hit the ground running with a bundled service offering pretty easily. Too late now .