There are many events that you can predict as a risk to your business operations, loss of power, loss of internet, severe weather, supply chain disruption etc. This is the purpose of your corporate risk register, which should be kept updated on a regular basis as your operational risks shift and change. But on top of your considered risk assessment planning, you must always make allowance for unknown events that can come at you out of a clear blue sky. Sometimes literally! There was just such an event in Holborn, Central London yesterday.