Barack Obama's overnight into Saturday here is a big moment - even though Britain is playing a second tier in rock star's big tour. Still, both Gordon Brown (Labor Prime Minister) and David Cameron (Conservative Party Leader) will be looking for a bit of Obamacadabra magic to rub off on them. Who wouldn't.
But protocol in these situations is all, and consequently there is much hand wringing. Gordon Brown is deeply restricted in what he can do with Obama, and there will be no handshakes outside Number 10 because there wasn't one when McCain came over.
...snip...
So it caused considerable consternation inside Number 10 when they were told by Obama's advisers that one plan under consideration was that the presumptive Democrat nominee would leave Downing Street and meet David Cameron at the gates of Downing Street. They would walk - yes walk - to Parliament for their meeting. Huge "spontaneous" photo op.
Though this plan was extremely risky for both sides and always seemed unlikely - Downing Street were terrified that this would be seen as a sign of Obama preferment. Which it would. The plan has now, apparently, been bashed on the head after high level intervention.
http://timesonline.typepad.com/politics/2008/07/how-obama-was-t.html