Clearly, much of it is in use in Iraq, but it's easily portable in smaller quantities.
I think Blair and Bush would be extremely interested in submerging any direct connection between coalition negligence in securing crucial WMD facilities, and the London bombs. They have succeeded in muddying the waters enough to deflect any widespread perception of a connection.
I also find the discrepancy in the story about the bathtub of TATP interesting, since one source says a trace, while the other report says "22lbs" of what should be liquid ingredients. Is it common in the UK to use weight measures to describe liquid volumes?