Proposal for Ofcom
Now that we've got this monitoring hardware in people's home's why not use it to adjust billing.
Simply adjust the user's bill based on the percentage of their theoretical maximum which was actually available to them, including the effect of any outages or downtime. Obviously this would have to be accompanied by an initial price rise, if ISPs had to charge honestly at current rates it'd bankrupt them, but once any shortfall or outage had a financial penalty then it'd introduce a competitive advantage to companies who could improve their rates (by reducing contention) or provide a more reliable service.