Prime Minister Theresa May will set out her vision of a successful Brexit on Sunday as investors raise growing concern that the world’s fifth largest economy could face upheaval from a disorderly exit from the European Union.

The June 23 Brexit vote took many investors and chief executives by surprise, triggering the deepest political and financial turmoil in Britain since World War Two and the biggest ever one-day fall in sterling against the dollar.

May’s government has tried to reassure manufacturers and banks that Britain is open for business and that it will take their views into account during the country’s negotiations on new trade relations with the EU.

In a speech to open the annual conference of the ruling Conservative Party on Sunday, May will give her first big speech on Brexit since winning Britain’s top job on July 13.

Prime Minister Theresa May passes tanks as she visits 1st Battalion The Mercian Regiment (Cheshire, Worcesters and Foresters, and Staffords) at their barracks at Bulford Camp on September 29, 2016 near Salisbury, England.  REUTERS/Matt Cardy/Pool

Prime Minister Theresa May passes tanks as she visits 1st Battalion The Mercian Regiment (Cheshire, Worcesters and Foresters, and Staffords) at their barracks at Bulford Camp on September 29, 2016 near Salisbury, England. REUTERS/Matt Cardy/Pool

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