The head of the International Monetary Fund warned that the British exit from the European Union means it 'will never be as good as it is now' for the country's economy.
Christine Lagarde spoke at the World Government Summit in Dubai, which also saw Lebanese Prime Minister Saad Hariri make an own investment pitch for his small country, now struggling through a major economic crisis as one of the world's most-indebted nations.
The clubby annual event brings world leaders together at a luxury hotel in Dubai for motivational talks littered with business buzzwords.
Christine didn't hesitate to criticize Britain's upcoming departure from the EU, known as 'Brexit'.
Britain is due to leave the European Union on March 29.
U.K businesses fear a possible 'no-deal' Brexit with the EU will cause economic chaos by imposing tariffs, customs and other barriers between Britain and mainland Europe.
"I'm certain of one thing, is that it's not going to be as good as if they had not been Brexit, that is for sure," Christine said.
"Whether it ends well, whether there is a smooth exit given by customs unions as predicated by some, or whether it's as a result of a brutal . exit on March 29 without extension of notice, it's not going to be as good as it is now."
She urged all parties to 'get ready for it' as it will upend how trade is now conducted with Britain.
(with news agency inputs)