From Brown's speech:
"And let me say what was once an aspiration — 0.7% of national income spent on international development aid, has become with Labour a promise, and will in future become a law. We will pass legislation that the British government is obliged to raise spending on aid to the poorest countries to 0.7% of our national income. Others may break their promises to the poorest, with Labour Britain never will."
That's good news.
No doubt the Tories will categorise the Afghan war as aid if they can. So the defitnion clause in the new law had better be good.