"five months since BBC heard about the planned invasion of Afghanistan,"
Nope. A Pakistani official claimed (in September, after the WTC bombing) that he was told in July (5 months ago) that the US planned to invade Afghanistan -- so the BBC didn't hear about it 5 months ago, but only after 9-11.
And, funny, but it was supposedly about handing over bin Laden even then. Guess we knew he was a bad guy, even before 9-11 (might have had something to do with his blowing up two of our embassies and one of our Navy ships -- I don't think the Bush team was as willing to let bin Laden continue his terrorist ways as the Clinton team was.)