By the look of it, one would never guess the G20 Summit will only be lasting two days.
All around London, barricades are going up, policemen are taking their places, and roads are being blocked off.
In The City, the financial district where many banks have their offices, security forces are extra-hawkish. They had a real-life dress rehearsal on Tuesday when an abandonned object was discovered by the side of the road.
In preparation for the Summit, police are expecting an anti-globalization protest on Wednesday . Many bankers have been told to dress casually, to blend in with the crowd.
I shall get in nice and early in the morning, as I always do, and I shall come in as normal, because I think that's the right thing to do.
But not everyone is feeling as confident. Some banks have boarded their windows, just in case the protest gets out of hand.
In Great-Britain public opinion largely blames the banking sector for the current economic crisis. And the City in particular has come to symbolize finance gone haywire.
London is holding its breath, hoping for the best, but prepared for the worst.