There was barely a suit and tie to be seen this morning in London's Square Mile, as workers across the financial heartland of London took heed of their employers' advice and dressed down for a day of protests ahead of the G20 summit, while fleets of police motorcycles and vans flooded the capital's streets.

There were few signs of protesters early this morning, but the security measures implemented by businesses in the region were clear. At least 20 police guarded the Bishopsgate offices of Royal Bank of Scotland, with eight police vans and an ambulance parked on stand-by across the road.