Given that Cameron has told the EU he won't be paying BBC it won't make much of a difference unless she actually does pay.
He sounded like a prime minister unleashed; by turns scornful and furious, lectern thumping, downright angry.
It seemed he was doing exactly what UKIP leader Nigel Farage demanded - refusing the European Commission any money at all.
But David Cameron was well in control.
He said he would not pay on 1 December, but did not rule out paying later.
He accepted the principle of a fluctuating EU budget that meant bills went up as well as down.
After that performance he cannot, and surely will not, pay what the Commission demands.
But by how far can he negotiate down the bill? Half of £1.7bn, a quarter, a third; all represent big money.
Were he to refuse to pay whatever the Commission finally demands, could he still persuade EU leaders in vital, future negotiations?
For a party leader battling Mr Farage, the pictures on the TV news tonight will be perfect.
If his diplomats can't do a decent deal, they will come back to haunt him.