According to media report the Brexit results to leave the European Union has cause a substantial deterioration in economic activities.
Service and manufacturing experience a decline in orders and output.
The report equates the falling of the index to the global financial crisis 2008 and the bursting of the Dot. Com bubble. You cannot get much lower than that crisis.
For more in-depth information on this crisis go to:http://www.bbc.co.uk/news/business-36864273