Highly unlikely I think that this attack is connected to the selection of London for the 2012 Olympics.

You have to figure this was planned well in advance: a cell in place, financing arranged, explosives prepared, targets selected, the attack coordinated.

But it’s been known for a while that Blair, Bush and other infidel leaders would be meeting in Scotland. From the point of view of the terrorists, London is close enough for anti-government work.