Who is going to use BT's network?
Last week, the Conservatives came up with a proposal to boost Britain's broadband performance - forcing BT to open up its network of ducts and poles to competitors.
In other words, allowing rival firms to lay their own fibre in the tunnels under the streets and along the telegraph poles which currently carry copper (and a little bit of fibre) telephone lines right into millions of customers' homes.
Now BT is saying that it is prepared to do just that - and that it has been talking to the regulator Ofcom about such plans for a while. And this is nothing to do with the Conservative proposal, insists BT's Chief Executive Ian Livingston:
"We told Ofcom last year we're willing to provide open access to our ducts and poles and we are working with them on how to achieve it. Other companies already have access to our exchanges, so we're relaxed about providing them with another form of access as well."
So will this help fill in the big gaps in fast broadband coverage which are threatening to turn Britain into a two-speed society, with rural areas left to get by on slower copper lines? To recap, the situation at present is that BT and Virgin Media are the only two operators with major plans to lay fibre - and it looks as though together they will only reach around 60% of UK households.
Both the Conservatives and the Labour government say their plans will see that coverage extended to 90% of homes by 2017, through a bit of public spending and a tweak in the regulatory environment.
BT expresses scepticism over whether rival firms will be clambering up its rural telegraph poles clutching bundles of fibre: "It's unlikely to be the silver bullet to get fibre to every home," says Mr Livingston. And he then lays out a challenge to his rivals: "BT is taking a considerable degree of commercial risk by rolling out fibre and it will be interesting to see if others are willing to join us."
But this scepticism is nothing new. What we will now find out is how accurate were BT's warnings about the fragility of the commercial case for laying fibre to every corner of the UK at a cost of many billions.
The advantage for BT is that the pressure from broadband campaigners may now switch from BT to the brash young upstart of the broadband world, Carphone Warehouse, whose TalkTalk is by some measures the UK's biggest single supplier. Rural-fibre enthusiasts may soon be calling Carphone boss Charles Dunstone to ask him when TalkTalk's 100mbps service is coming up their lane.